kiln_controller/firmware/controller/controller.ino

178 wiersze
3.9 KiB
Arduino
Czysty Zwykły widok Historia

2014-11-27 16:44:37 +00:00
#include <Bounce2.h>
#define PIN_IGNITE 10
#define PIN_STEP1 9
#define PIN_STEP2 8
#define PIN_STEP3 7
#define PIN_STEP4 6
#define PIN_AUXTEMP A1
#define PIN_TEMP_CS 4
#define PIN_LOADCELL A3
#define PIN_FLAME_A A2
#define PIN_FLAME_D 1
#define PIN_REGLIMIT 5
#define STEP_SPEED 250//in steps per second
#define TEMP_UPDATE 100 //milliseconds
#define MOTOR_TIMEOUT 5000 //milliseconds
#include <Stepper.h>
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_MAX31855.h>
struct Status {
unsigned char ignite;
unsigned char flame;
unsigned int motor;
float main_temp;
float ambient;
float weight;
float aux_temp[2];
} status;
uint8_t* status_data = (uint8_t*) &status;
const float step_interval = 1. / STEP_SPEED * 1000.; //milliseconds
//intermediate variables
Adafruit_MAX31855 thermo(PIN_TEMP_CS);
Stepper stepper(2048, PIN_STEP1, PIN_STEP3, PIN_STEP2, PIN_STEP4);
Bounce debouncer = Bounce();
unsigned int n_clicks = 0; //Number of full rotations
unsigned long stepper_target;
char i2c_command;
float next_step;
unsigned long next_temp;
unsigned char motor_active = false;
void setup() {
status.flame = false;
status.weight = 0.;
status.aux_temp[0] = 0.;
status.aux_temp[1] = 0.;
//Setup I2C
Wire.begin(0x08);
Wire.onRequest(i2c_update);
Wire.onReceive(i2c_action);
//Set up regulator stepper
status.motor = 0;
stepper_target = 0;
//Set pullup for regulator limit
pinMode(PIN_REGLIMIT, INPUT);
digitalWrite(PIN_REGLIMIT, HIGH);
debouncer.attach(PIN_REGLIMIT);
debouncer.interval(5);
//setup ignition mosfet
pinMode(PIN_IGNITE, OUTPUT);
digitalWrite(PIN_IGNITE, LOW);
status.ignite = false;
//set initial temperature
delay(500);
update_temp();
next_temp = millis() + TEMP_UPDATE;
}
unsigned long now;
void loop() {
now = millis();
if (stepper_target != status.motor && now > next_step) {
int dir = status.motor < stepper_target ? 1 : -1;
stepper.step(dir);
boolean check = debouncer.update() && debouncer.read() == HIGH;
if (check) {
n_clicks += dir;
}
//If homing, continuing moving until switch is zero
if (stepper_target == 0 && check && n_clicks == 0) {
status.motor = 0;
} else {
status.motor += dir;
}
next_step += step_interval;
}
//put motor to sleep after timeout
if (motor_active && (now - next_step) > MOTOR_TIMEOUT) {
digitalWrite(PIN_STEP1, LOW);
digitalWrite(PIN_STEP2, LOW);
digitalWrite(PIN_STEP3, LOW);
digitalWrite(PIN_STEP4, LOW);
motor_active = false;
}
//update temperature
if (now > next_temp) {
update_temp();
next_temp += TEMP_UPDATE;
}
//check flame status
}
void set_regulator(unsigned long pos) {
motor_active = true;
if (stepper_target == status.motor)
next_step = millis(); //Start stepping immediately
stepper_target = pos;
}
void update_temp() {
TempData temps;
thermo.readAll(temps);
status.main_temp = temps.celcius;
status.ambient = temps.internal;
}
void i2c_update() {
//update temperatures
if (i2c_command == 'M') {
Wire.write((byte*) &(status.motor), 4);
} else if (i2c_command == 'I') {
Wire.write((byte*) &(status.ignite), 1);
} else if (i2c_command == 'T') {
Wire.write((byte*) &(status.main_temp), 4);
} else if (i2c_command == 'F') {
Wire.write((byte*) &(status.flame), 1);
} else {
Wire.write(status_data, sizeof(struct Status));
}
i2c_command = 0;
}
byte buffer[32];
void i2c_action(int nbytes) {
i2c_command = Wire.read();
int i = 0;
while (Wire.available()) {
buffer[i++] = Wire.read();
}
if (nbytes == 1) {
return; //Command already stored, no arguments
}
switch (i2c_command) {
case 'M':
set_regulator(*((unsigned long*) buffer));
break;
case 'I':
digitalWrite(PIN_TEMP_CS, buffer[0]);
break;
}
i2c_command = 0;
}