kopia lustrzana https://github.com/jamesgao/kiln_controller
Merge branch 'master' of https://github.com/jamesgao/kiln_controller
Helene Moorman
commit
fee6ed6c0c
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@ -1,6 +0,0 @@
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Raspberry Pi controlled Kiln
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============================
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This project implements a wifi-accessible temperature controller for a ceramic firing kiln.
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Please see the BOM for all the parts we purchased for this project. Additional circuit diagrams and 3D models will be forthcoming.
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@ -3,7 +3,7 @@
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#define PIN_STEP2 8
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#define PIN_STEP3 7
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#define PIN_STEP4 6
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#define PIN_AUXTEMP A1
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#define PIN_AUXTEMP 2
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#define PIN_TEMP_CS 4
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#define PIN_LOADCELL A3
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#define PIN_FLAME_A A2
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@ -12,8 +12,17 @@
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#define STEP_SPEED 275//in steps per second
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#define TEMP_UPDATE 250 //milliseconds
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#define MOTOR_TIMEOUT 5000 //milliseconds
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#define AUX_UPDATE 1000 //milliseconds
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#define MOTOR_TIMEOUT 60000 //milliseconds
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#define NUM_AUXTEMP 2
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#define NO_PORTB_PINCHANGES
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#define NO_PORTC_PINCHANGES
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#define DISABLE_PCINT_MULTI_SERVICE
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#include <OneWire.h>
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#include <DallasTemperature.h>
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#include <Stepper.h>
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#include <Wire.h>
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#include <SPI.h>
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@ -28,7 +37,7 @@ struct Status {
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float main_temp;
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float ambient;
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float weight;
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float aux_temp[2];
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float aux_temp[NUM_AUXTEMP];
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} status;
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uint8_t* status_data = (uint8_t*) &status;
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@ -36,22 +45,34 @@ const float step_interval = 1. / STEP_SPEED * 1000.; //milliseconds
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//intermediate variables
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Adafruit_MAX31855 thermo(PIN_TEMP_CS);
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Stepper stepper(2048, PIN_STEP1, PIN_STEP3, PIN_STEP2, PIN_STEP4);
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Stepper stepper(2048, PIN_STEP4, PIN_STEP2, PIN_STEP3, PIN_STEP1);
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pushbutton reglimit = pushbutton(PIN_REGLIMIT, 5);
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OneWire oneWire(PIN_AUXTEMP);
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DallasTemperature sensors(&oneWire);
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DeviceAddress aux_addr[NUM_AUXTEMP];
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char i2c_command;
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float next_step;
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unsigned long next_temp;
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unsigned long next_aux = 0;
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unsigned char motor_active = false;
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unsigned long stepper_target = 0;
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unsigned int n_clicks = 0; //Number of full rotations
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unsigned long num_aux = 0;
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int n_clicks = 0; //Number of full rotations
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boolean limit_state = false;
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unsigned long limit_last;
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void setup() {
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//setup ignition mosfet
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pinMode(PIN_IGNITE, OUTPUT);
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digitalWrite(PIN_IGNITE, LOW);
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status.ignite = 0.;
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status.flame = false;
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status.weight = 0.;
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status.aux_temp[0] = 0.;
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status.aux_temp[1] = 0.;
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status.aux_temp[0] = -1.;
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status.aux_temp[1] = -1.;
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sensors.begin();
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//Setup I2C
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Wire.begin(0x08);
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@ -61,33 +82,32 @@ void setup() {
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//Set up regulator stepper
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status.motor = 0;
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//setup regulator limit switch
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pinMode(PIN_REGLIMIT, INPUT);
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digitalWrite(PIN_REGLIMIT, HIGH);
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//setup ignition mosfet
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pinMode(PIN_IGNITE, OUTPUT);
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digitalWrite(PIN_IGNITE, LOW);
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status.ignite = false;
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//set initial temperature
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//set initial thermocouple temperature
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delay(500);
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update_temp();
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next_temp = millis() + TEMP_UPDATE;
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//Setup auxtemp ds18b20 sensors
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num_aux = sensors.getDeviceCount();
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num_aux = NUM_AUXTEMP < num_aux ? NUM_AUXTEMP : num_aux;
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for (int i = 0; i < num_aux; i++) {
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sensors.getAddress(aux_addr[i], i);
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sensors.setResolution(aux_addr[i], 12);
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status.aux_temp[i] = 0.;
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}
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if (num_aux > 0) {
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sensors.setWaitForConversion(false);
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sensors.requestTemperatures();
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next_aux = millis() + AUX_UPDATE;
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}
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}
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int dir;
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unsigned long now;
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void loop() {
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now = millis();
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if (digitalRead(PIN_REGLIMIT) == LOW) {
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if (limit_last == 0) {
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limit_last = millis();
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} else if ((millis() - limit_last) > 5) {
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n_clicks += dir;
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limit_last = 0;
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}
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}
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reglimit.update();
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status.aux_temp[1] = reglimit.n_clicks;
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if (stepper_target != status.motor && now > next_step) {
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dir = status.motor < stepper_target ? 1 : -1;
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@ -95,7 +115,7 @@ void loop() {
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//Limit switch tripped
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if (stepper_target == 0) {
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if (n_clicks == 0)
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if (reglimit.n_clicks == 0)
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status.motor = 0;
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} else {
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status.motor += dir;
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@ -119,6 +139,12 @@ void loop() {
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next_temp += TEMP_UPDATE;
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}
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//update auxtemp
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if (num_aux > 0 && now > next_aux) {
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update_aux();
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next_aux += AUX_UPDATE;
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}
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//check flame status
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}
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@ -134,9 +160,14 @@ void update_temp() {
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thermo.readAll(status.main_temp, status.ambient);
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}
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void i2c_update() {
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//update temperatures
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void update_aux() {
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for (int i = 0; i < num_aux; i++) {
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status.aux_temp[i] = sensors.getTempC(aux_addr[i]);
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}
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sensors.requestTemperatures();
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}
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void i2c_update() {
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if (i2c_command == 'M') {
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Wire.write((byte*) &(status.motor), 4);
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} else if (i2c_command == 'I') {
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@ -170,7 +201,8 @@ void i2c_action(int nbytes) {
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set_regulator(*((unsigned int*) buffer));
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break;
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case 'I':
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digitalWrite(PIN_IGNITE, buffer[0]);
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analogWrite(PIN_IGNITE, buffer[0]);
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status.ignite = buffer[0];
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break;
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}
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@ -1,7 +1,7 @@
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class pushbutton : public CallBackInterface
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{
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public:
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uint8_t n_clicks;
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int n_clicks;
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uint8_t pin;
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unsigned int interval;
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unsigned long last;
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@ -11,8 +11,6 @@ class pushbutton : public CallBackInterface
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n_clicks = 0;
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last = 0;
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init();
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state = digitalRead(pin);
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};
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void cbmethod() {
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last = millis();
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@ -31,12 +29,11 @@ class pushbutton : public CallBackInterface
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private:
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int dir;
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boolean state;
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void init () {
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pinMode(pin, INPUT);
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digitalWrite(pin, HIGH);
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PCintPort::attachInterrupt(pin, this, FALLING);
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PCintPort::attachInterrupt(pin, this, CHANGE);
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};
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};
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@ -1,174 +0,0 @@
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#define PIN_IGNITE 10
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#define PIN_STEP1 9
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#define PIN_STEP2 8
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#define PIN_STEP3 7
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#define PIN_STEP4 6
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#define PIN_AUXTEMP A1
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#define PIN_TEMP_CS 4
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#define PIN_LOADCELL A3
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#define PIN_FLAME_A A2
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#define PIN_FLAME_D 1
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#define PIN_REGLIMIT 5
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#define STEP_SPEED 275//in steps per second
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#define TEMP_UPDATE 250 //milliseconds
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#define MOTOR_TIMEOUT 5000 //milliseconds
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#define NO_PORTB_PINCHANGES
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#define NO_PORTC_PINCHANGES
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#define DISABLE_PCINT_MULTI_SERVICE
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#include <Stepper.h>
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#include <Wire.h>
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#include <SPI.h>
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#include <Adafruit_MAX31855.h>
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#include <ooPinChangeInt.h>
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#include "pushbutton.h"
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struct Status {
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unsigned char ignite;
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unsigned char flame;
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unsigned int motor;
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float main_temp;
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float ambient;
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float weight;
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float aux_temp[2];
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} status;
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uint8_t* status_data = (uint8_t*) &status;
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const float step_interval = 1. / STEP_SPEED * 1000.; //milliseconds
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//intermediate variables
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Adafruit_MAX31855 thermo(PIN_TEMP_CS);
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Stepper stepper(2048, PIN_STEP4, PIN_STEP2, PIN_STEP3, PIN_STEP1);
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pushbutton reglimit = pushbutton(PIN_REGLIMIT, 5);
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char i2c_command;
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float next_step;
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unsigned long next_temp;
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unsigned char motor_active = false;
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unsigned long stepper_target = 0;
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int n_clicks = 0; //Number of full rotations
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boolean limit_state = false;
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unsigned long limit_last;
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void setup() {
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status.flame = false;
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status.weight = 0.;
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status.aux_temp[0] = 0.;
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status.aux_temp[1] = 0.;
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//Setup I2C
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Wire.begin(0x08);
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Wire.onRequest(i2c_update);
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Wire.onReceive(i2c_action);
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//Set up regulator stepper
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status.motor = 0;
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//setup ignition mosfet
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pinMode(PIN_IGNITE, OUTPUT);
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digitalWrite(PIN_IGNITE, LOW);
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status.ignite = false;
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//set initial temperature
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delay(500);
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update_temp();
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next_temp = millis() + TEMP_UPDATE;
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}
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int dir;
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unsigned long now;
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void loop() {
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now = millis();
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reglimit.update();
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status.aux_temp[0] = reglimit.n_clicks;
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if (stepper_target != status.motor && now > next_step) {
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dir = status.motor < stepper_target ? 1 : -1;
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stepper.step(dir);
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//Limit switch tripped
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if (stepper_target == 0) {
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if (reglimit.n_clicks == 0)
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status.motor = 0;
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} else {
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status.motor += dir;
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}
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next_step += step_interval;
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}
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//put motor to sleep after timeout
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if (motor_active && (now - next_step) > MOTOR_TIMEOUT) {
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digitalWrite(PIN_STEP1, LOW);
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digitalWrite(PIN_STEP2, LOW);
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digitalWrite(PIN_STEP3, LOW);
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digitalWrite(PIN_STEP4, LOW);
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motor_active = false;
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}
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//update temperature
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if (now > next_temp) {
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update_temp();
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next_temp += TEMP_UPDATE;
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}
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//check flame status
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}
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void set_regulator(unsigned long pos) {
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motor_active = true;
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reglimit.setDir(status.motor < pos ? 1 : -1);
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if (stepper_target == status.motor)
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next_step = millis(); //Start stepping immediately
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stepper_target = pos;
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}
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void update_temp() {
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thermo.readAll(status.main_temp, status.ambient);
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}
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void i2c_update() {
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//update temperatures
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if (i2c_command == 'M') {
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Wire.write((byte*) &(status.motor), 4);
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} else if (i2c_command == 'I') {
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Wire.write((byte*) &(status.ignite), 1);
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} else if (i2c_command == 'T') {
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Wire.write((byte*) &(status.main_temp), 4);
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} else if (i2c_command == 'F') {
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Wire.write((byte*) &(status.flame), 1);
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} else {
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Wire.write(status_data, sizeof(struct Status));
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}
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i2c_command = 0;
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}
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byte buffer[32];
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void i2c_action(int nbytes) {
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i2c_command = Wire.read();
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int i = 0;
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while (Wire.available()) {
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buffer[i++] = Wire.read();
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}
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if (nbytes == 1) {
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return; //Command already stored, no arguments
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}
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switch (i2c_command) {
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case 'M':
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set_regulator(*((unsigned int*) buffer));
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break;
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case 'I':
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analogWrite(PIN_IGNITE, buffer[0]);
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status.ignite = buffer[0];
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break;
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}
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i2c_command = 0;
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}
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@ -1,39 +0,0 @@
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#include "protocol.h"
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char Comm::buffer[BUFFER_LENGTH+1];
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int Comm::_nacts;
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char Comm::_commands[MAX_ACTIONS];
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char* (*Comm::_actions[MAX_ACTIONS])(int, char*);
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char Comm::_current_cmd;
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int Comm::_current_len;
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Comm::Comm(int addr) {
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Wire.begin(addr);
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Wire.onReceive(_handle_request);
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Wire.onRequest(_handle_response);
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}
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int Comm::action(char cmd, char* (*func)(int, char*)) {
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if (_nacts >= MAX_ACTIONS)
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return 1;
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_actions[_nacts] = func;
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return 0;
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}
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void Comm::_handle_request(int nbytes) {
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_current_cmd = Wire.read();
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_current_len = nbytes-1;
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for (int i = 0; i < nbytes-1; i++) {
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buffer[i] = Wire.read();
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}
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}
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void Comm::_handle_response() {
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for (int i = 0; i < MAX_ACTIONS; i++) {
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if (_commands[i] == _current_cmd) {
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_actions[i](_current_len, buffer);
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}
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}
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Wire.write(buffer);
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}
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@ -1,25 +0,0 @@
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#ifndef PROTOCOL_H
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#define PROTOCOL_H
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#include "Wire.h"
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#define MAX_ACTIONS 16
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class Comm {
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private:
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static char buffer[BUFFER_LENGTH+1];
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static int _nacts;
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static char _commands[MAX_ACTIONS];
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static char* (*_actions[MAX_ACTIONS])(int, char*);
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static char _current_cmd;
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static int _current_len;
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static void _handle_request(int);
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static void _handle_response(void);
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public:
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Comm(int addr);
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int action(char, char* (*)(int, char*));
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};
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||||
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||||
#endif //PROTOCOL_H
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@ -1,39 +0,0 @@
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class pushbutton : public CallBackInterface
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{
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public:
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int n_clicks;
|
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uint8_t pin;
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unsigned int interval;
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unsigned long last;
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pushbutton (uint8_t _pin, unsigned int _interval): pin(_pin) , interval(_interval) {
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dir = 0;
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n_clicks = 0;
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last = 0;
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init();
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};
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void cbmethod() {
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last = millis();
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};
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||||
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void update() {
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if (last != 0 && (millis() - last) > interval) {
|
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n_clicks += dir;
|
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last = 0;
|
||||
}
|
||||
}
|
||||
|
||||
void setDir(int d) {
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dir = d;
|
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}
|
||||
|
||||
private:
|
||||
int dir;
|
||||
|
||||
void init () {
|
||||
pinMode(pin, INPUT);
|
||||
digitalWrite(pin, HIGH);
|
||||
PCintPort::attachInterrupt(pin, this, CHANGE);
|
||||
};
|
||||
};
|
||||
|
||||
|
|
@ -127,6 +127,7 @@ class Profile(threading.Thread):
|
|||
self.pid = PID.PID(Kp, Ki, Kd)
|
||||
self.callback = callback
|
||||
self.running = True
|
||||
self.duty_cycle = False
|
||||
self.start()
|
||||
|
||||
@property
|
||||
|
|
@ -142,8 +143,8 @@ class Profile(threading.Thread):
|
|||
self.running = False
|
||||
|
||||
def run(self):
|
||||
_next = time.time()+self.interval
|
||||
while not self.completed and self.running:
|
||||
now = time.time()
|
||||
ts = self.elapsed
|
||||
#find epoch
|
||||
for i in range(len(self.schedule)-1):
|
||||
|
|
@ -157,13 +158,25 @@ class Profile(threading.Thread):
|
|||
temp = self.therm.temperature.temp
|
||||
if temp == -1:
|
||||
continue #skip invalid temperature readings
|
||||
|
||||
pid_out = self.pid.update(temp)
|
||||
if pid_out < 0: pid_out = 0
|
||||
if pid_out > 1: pid_out = 1
|
||||
self.regulator.set(pid_out)
|
||||
elif temp - setpoint > 10:
|
||||
self.regulator.off()
|
||||
self.duty_cycle = True
|
||||
pid_out = -1
|
||||
elif self.duty_cycle:
|
||||
if temp - setpoint < -5:
|
||||
self.regulator.ignite()
|
||||
self.duty_cycle = False
|
||||
pid_out = -1
|
||||
else:
|
||||
pid_out = self.pid.update(temp)
|
||||
if pid_out < 0: pid_out = 0
|
||||
if pid_out > 1: pid_out = 1
|
||||
self.regulator.set(pid_out)
|
||||
|
||||
if self.callback is not None:
|
||||
self.callback(temp, setpoint, pid_out)
|
||||
|
||||
time.sleep(self.interval - (time.time()-now))
|
||||
sleep = _next - time.time()
|
||||
if sleep > 0:
|
||||
time.sleep(sleep)
|
||||
_next += self.interval
|
||||
|
|
|
|||
|
|
@ -244,10 +244,10 @@ class Regulator(threading.Thread):
|
|||
pass
|
||||
|
||||
class Breakout(object):
|
||||
def __init__(self, addr, maxsteps=6500, minsteps=2300):
|
||||
def __init__(self, addr, maxsteps=6500, minsteps=((2600, 0), (2300, 15)) ):
|
||||
import breakout
|
||||
self.device = breakout.Breakout(addr)
|
||||
self.min = minsteps
|
||||
self.min_interp = minsteps
|
||||
self.max = maxsteps
|
||||
|
||||
def exit():
|
||||
|
|
@ -255,31 +255,41 @@ class Breakout(object):
|
|||
self.off()
|
||||
atexit.register(exit)
|
||||
|
||||
def ignite(self, start=2500, delay=5):
|
||||
@property
|
||||
def min(self):
|
||||
temp = self.device.status.aux_temp0
|
||||
if temp > self.min_interp[1][1]:
|
||||
return self.min_interp[1][0]
|
||||
elif temp <= self.min_interp[0][1]:
|
||||
return self.min_interp[0][0]
|
||||
else:
|
||||
mrange = self.min_interp[0][0] - self.min_interp[1][0]
|
||||
trange = self.min_interp[1][1] - self.min_interp[0][1]
|
||||
mix = (temp - self.min_interp[0][1]) / float(trange)
|
||||
return mrange * mix + self.min_interp[1][0]
|
||||
|
||||
def ignite(self, start=2400):
|
||||
logger.info("Igniting system")
|
||||
self.device.ignite = 127
|
||||
time.sleep(2)
|
||||
self.device.ignite = 255
|
||||
time.sleep(delay)
|
||||
self.device.motor = start
|
||||
while self.device.motor != start:
|
||||
time.sleep(.1)
|
||||
self.device.motor = self.min
|
||||
#self.device.ignite = 127
|
||||
|
||||
@property
|
||||
def output(self):
|
||||
out = (self.device.motor - self.min) / float(self.max - self.min)
|
||||
m = self.min
|
||||
out = (self.device.motor - m) / float(self.max - m)
|
||||
if out < 0:
|
||||
return -1
|
||||
return out
|
||||
|
||||
def set(self, value):
|
||||
m = self.min
|
||||
if self.device.motor == 0:
|
||||
raise ValueError('Must ignite first')
|
||||
if not 0 <= value <= 1:
|
||||
raise ValueError('Must give value between 0 and 1')
|
||||
self.device.motor = int((self.max - self.min)*value + self.min)
|
||||
self.device.motor = int((self.max - m)*value + m)
|
||||
|
||||
def off(self):
|
||||
self.device.motor = 0
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue