WLED/usermods/rotary_encoder_change_brightness/usermode_rotary_set.h

#pragma once

#include "wled.h"

//v2 usermod that allows to change brightness and color using a rotary encoder, 
//change between modes by pressing a button (many encoder have one included)
class RotaryEncoderSet : public Usermod
{
private:
  //Private class members. You can declare variables and functions only accessible to your usermod here
  unsigned long lastTime = 0;
  /*
** Rotary Encoder Example
** Use the Sparkfun Rotary Encoder to vary brightness of LED
**
** Sample the encoder at 500Hz using the millis() function
*/

  int fadeAmount = 5; // how many points to fade the Neopixel with each step
  unsigned long currentTime;
  unsigned long loopTime;
  const int pinA = 5;             // DT from encoder
  const int pinB = 18;            // CLK from encoder
  const int pinC = 23;            // SW from encoder
  unsigned char select_state = 0; // 0 = brightness 1 = color
  unsigned char button_state = HIGH;
  unsigned char prev_button_state = HIGH;
  CRGB fastled_col;
  CHSV prim_hsv;
  int16_t new_val;

  unsigned char Enc_A;
  unsigned char Enc_B;
  unsigned char Enc_A_prev = 0;

public:
  //Functions called by WLED

  /*
     * setup() is called once at boot. WiFi is not yet connected at this point.
     * You can use it to initialize variables, sensors or similar.
     */
  void setup()
  {
    //Serial.println("Hello from my usermod!");
    pinMode(pinA, INPUT_PULLUP);
    pinMode(pinB, INPUT_PULLUP);
    pinMode(pinC, INPUT_PULLUP);
    currentTime = millis();
    loopTime = currentTime;
  }

  /*
     * connected() is called every time the WiFi is (re)connected
     * Use it to initialize network interfaces
     */
  void connected()
  {
    //Serial.println("Connected to WiFi!");
  }

  /*
     * loop() is called continuously. Here you can check for events, read sensors, etc.
     * 
     * Tips:
     * 1. You can use "if (WLED_CONNECTED)" to check for a successful network connection.
     *    Additionally, "if (WLED_MQTT_CONNECTED)" is available to check for a connection to an MQTT broker.
     * 
     * 2. Try to avoid using the delay() function. NEVER use delays longer than 10 milliseconds.
     *    Instead, use a timer check as shown here.
     */
  void loop()
  {
    currentTime = millis(); // get the current elapsed time

    if (currentTime >= (loopTime + 2)) // 2ms since last check of encoder = 500Hz
    {
      button_state = digitalRead(pinC);
      if (prev_button_state != button_state)
      {
        if (button_state == LOW)
        {
          if (select_state == 1)
          {
            select_state = 0;
          }
          else
          {
            select_state = 1;
          }
          prev_button_state = button_state;
        }
        else
        {
          prev_button_state = button_state;
        }
      }
      int Enc_A = digitalRead(pinA); // Read encoder pins
      int Enc_B = digitalRead(pinB);
      if ((!Enc_A) && (Enc_A_prev))
      { // A has gone from high to low
        if (Enc_B == HIGH)
        { // B is high so clockwise
          if (select_state == 0)
          {
            if (bri + fadeAmount <= 255)
              bri += fadeAmount; // increase the brightness, dont go over 255
          }
          else
          {
            fastled_col.red = col[0];
            fastled_col.green = col[1];
            fastled_col.blue = col[2];
            prim_hsv = rgb2hsv_approximate(fastled_col);
            new_val = (int16_t)prim_hsv.h + fadeAmount;
            if (new_val > 255)
              new_val -= 255; // roll-over if  bigger than 255
            if (new_val < 0)
              new_val += 255; // roll-over if smaller than 0
            prim_hsv.h = (byte)new_val;
            hsv2rgb_rainbow(prim_hsv, fastled_col);
            col[0] = fastled_col.red;
            col[1] = fastled_col.green;
            col[2] = fastled_col.blue;
          }
        }
        else if (Enc_B == LOW)
        { // B is low so counter-clockwise
          if (select_state == 0)
          {
            if (bri - fadeAmount >= 0)
              bri -= fadeAmount; // decrease the brightness, dont go below 0
          }
          else
          {
            fastled_col.red = col[0];
            fastled_col.green = col[1];
            fastled_col.blue = col[2];
            prim_hsv = rgb2hsv_approximate(fastled_col);
            new_val = (int16_t)prim_hsv.h - fadeAmount;
            if (new_val > 255)
              new_val -= 255; // roll-over if  bigger than 255
            if (new_val < 0)
              new_val += 255; // roll-over if smaller than 0
            prim_hsv.h = (byte)new_val;
            hsv2rgb_rainbow(prim_hsv, fastled_col);
            col[0] = fastled_col.red;
            col[1] = fastled_col.green;
            col[2] = fastled_col.blue;
          }
        }
        //call for notifier -> 0: init 1: direct change 2: button 3: notification 4: nightlight 5: other (No notification)
        // 6: fx changed 7: hue 8: preset cycle 9: blynk 10: alexa
        colorUpdated(NOTIFIER_CALL_MODE_BUTTON);
        updateInterfaces()
      }
      Enc_A_prev = Enc_A;     // Store value of A for next time
      loopTime = currentTime; // Updates loopTime
    }
  }

  /*
     * addToJsonInfo() can be used to add custom entries to the /json/info part of the JSON API.
     * Creating an "u" object allows you to add custom key/value pairs to the Info section of the WLED web UI.
     * Below it is shown how this could be used for e.g. a light sensor
     */
  /*
    void addToJsonInfo(JsonObject& root)
    {
      int reading = 20;
      //this code adds "u":{"Light":[20," lux"]} to the info object
      JsonObject user = root["u"];
      if (user.isNull()) user = root.createNestedObject("u");

      JsonArray lightArr = user.createNestedArray("Light"); //name
      lightArr.add(reading); //value
      lightArr.add(" lux"); //unit
    }
    */

  /*
     * addToJsonState() can be used to add custom entries to the /json/state part of the JSON API (state object).
     * Values in the state object may be modified by connected clients
     */
  void addToJsonState(JsonObject &root)
  {
    //root["user0"] = userVar0;
  }

  /*
     * readFromJsonState() can be used to receive data clients send to the /json/state part of the JSON API (state object).
     * Values in the state object may be modified by connected clients
     */
  void readFromJsonState(JsonObject &root)
  {
    userVar0 = root["user0"] | userVar0; //if "user0" key exists in JSON, update, else keep old value
    //if (root["bri"] == 255) Serial.println(F("Don't burn down your garage!"));
  }

  /*
     * getId() allows you to optionally give your V2 usermod an unique ID (please define it in const.h!).
     * This could be used in the future for the system to determine whether your usermod is installed.
     */
  uint16_t getId()
  {
    return 0xABCD;
  }

  //More methods can be added in the future, this example will then be extended.
  //Your usermod will remain compatible as it does not need to implement all methods from the Usermod base class!
};