copied brightness relevant code from tischlicht
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/*
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* Wemos d1 mini
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* Flash Size: 4M (1M SPIFFS)
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*/
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//Upload config: platformio run --target uploadfs
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#include <Arduino.h>
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#include <Homie.h>
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#define FW_NAME "kuechenlicht"
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#define FW_VERSION "1.0.0"
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bool enableHandler(const HomieRange& range, const String& value);
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bool fadetimeHandler(const HomieRange& range, const String& value);
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bool brightnessHandler(const HomieRange& range, const String& value);
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void loopHandler();
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//#define DEBUG //turns on continuous serial debug printing
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HomieNode lightNode("light", "Light", "light"); //paramters: topic, $name, $type
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#define LED_PWM D5
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#define BTN_A D7
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#define PWM_MAX 1023 //10 bit dac
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#define PWM_FREQUENCY 1000 //default: 1000 Hz
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boolean enable=false;
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float enable_fadevalue=0; //0=off, 1=on
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float enable_fadevalue_change_per_loop=0.01; //fixed value. For manual calculatoin: enable_fadevalue_change_per_loop=_difference/fadetime*UPDATETIME;
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float set_brightness=2; //0 to 1
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#define BRIGHTNESS_MIN 0.0
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#define BRIGHTNESS_MAX 2.0 //if temperature is in between both strips brightness of 2 means both are at full power. otherwise brightness will be clipped
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#define BRIGHTNESSCURVE 1.4
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float brightness=set_brightness;
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float brightness_change_per_loop=0; //will be calculated by Handler
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uint16_t fadetime=0; //0=instant. value is time in milliseconds
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#define FADETIME_MIN 0
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#define FADETIME_MAX 60000
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long last_updatetime=0;
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#define UPDATETIME 10 //after how many ms pwm values will be updated
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//Button stuff
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#define BUTTONUPDATETIME 20
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long last_buttonupdatetime=0;
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uint8_t btnAstate=0; //for button state machine
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long btnAtime=0;
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#define BTNHOLDTIME 1000
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boolean holdDirection_brightness=false;
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#define HOLDBRIGHTNESSCHANGE_PER_LOOP 0.01 //depends on BUTTONUPDATETIME. BUTTONUPDATETIME/1000/HOLDBRIGHTNESSCHANGE_PER_LOOP=seconds to change a full cycle(0 to 1)
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boolean flag_updatePWM=false; //if manually set brightness or temperature, set this flag
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//Debug
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long last_debugupdatetime=0;
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#define DEBUGUPDATETIME 500
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//To check if values changed (for mqtt response)
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boolean known_enable=!enable; //start with differend known values, actual values will be send first
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float known_set_brightness=set_brightness+1;
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void setup() {
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Serial.begin(115200);
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Serial.println("Hello");
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pinMode(LED_PWM, OUTPUT);
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analogWriteFreq(PWM_FREQUENCY);
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analogWrite(LED_PWM, PWM_MAX); //high = off
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pinMode(BTN_A, INPUT);
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Homie_setFirmware(FW_NAME, FW_VERSION);
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Homie_setBrand(FW_NAME);
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Homie.setLoopFunction(loopHandler);
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lightNode.advertise("brightness").settable(brightnessHandler);
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lightNode.advertise("fadetime").settable(fadetimeHandler);
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lightNode.advertise("enable").settable(enableHandler);
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Homie.setup();
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}
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void loop() {
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Homie.loop();
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}
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void loopHandler() {
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long loopmillis=millis();
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if (loopmillis >= last_buttonupdatetime+BUTTONUPDATETIME ) {
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last_buttonupdatetime = loopmillis;
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// #### Button A ####
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boolean flag_btnApress=false; //short press on release
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boolean flag_btnAholdstart=false; //long press on start
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boolean flag_btnAhold=false; //long press after long press time
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boolean flag_btnAholdrelease=false; //long press on release
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if (digitalRead(BTN_A)) { //Button State Machine
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switch (btnAstate) {
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case 0: //was not pressed
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btnAstate=1;
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btnAtime=loopmillis; //start timer
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break;
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case 1: //was pressed last time checked
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if (loopmillis>btnAtime+BTNHOLDTIME) {
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btnAstate=2;
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flag_btnAholdstart=true;
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}
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break;
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case 2: //button hold time reached
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flag_btnAhold=true;
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break;
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}
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}else {
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if (btnAstate==1) { //short press
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btnAstate=0; //reset state
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flag_btnApress=true;
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}else if(btnAstate==2) { //long press released
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flag_btnAholdrelease=true;
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btnAstate=0; //reset state
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}
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}
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// #### END Button A Check ####
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//Button handling
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if (flag_btnApress){ //short press button
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enable = !enable; //switch on/off
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flag_updatePWM=true; //update pwm values
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}
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if (!enable && flag_btnAholdstart ) { //in not enabled and brightness button held down
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enable=true; //enable light
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set_brightness=0; //reset brightness
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brightness=set_brightness; //immediately
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holdDirection_brightness=true; //increase brightness
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} else if (enable) { //only change values if enabled
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// Button A Longpress Handling
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if (flag_btnAholdstart) {
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/* //Change only hold direction at extremes
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if (set_brightness>=BRIGHTNESS_MAX) { //if hold started with brightness at one extreme
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holdDirection_brightness=false; //direction decrease
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}
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if (set_brightness<=BRIGHTNESS_MIN) { //if hold started with brightness at one extreme
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holdDirection_brightness=true; //direction increase
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}
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*/
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holdDirection_brightness=!holdDirection_brightness; //change direction everytime
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}
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if (flag_btnAhold) { //brightness
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if (holdDirection_brightness) {
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set_brightness += HOLDBRIGHTNESSCHANGE_PER_LOOP;
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}else{
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set_brightness -= HOLDBRIGHTNESSCHANGE_PER_LOOP;
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}
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set_brightness = constrain(set_brightness, BRIGHTNESS_MIN, BRIGHTNESS_MAX);
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brightness=set_brightness; //change immediately
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flag_updatePWM=true; //update pwm values
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}
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if (flag_btnAholdrelease) {
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}
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}
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}
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if (loopmillis >= last_updatetime+UPDATETIME ) {
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last_updatetime = loopmillis;
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float old_brightness = brightness; //store last brightness
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if ( (brightness_change_per_loop<0 && brightness>set_brightness) || (brightness_change_per_loop>0 && brightness<set_brightness)) { //if brightness not reached
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brightness += brightness_change_per_loop;
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if ( ( old_brightness <= set_brightness && set_brightness <= brightness ) || ( old_brightness >= set_brightness && set_brightness >= brightness ) ) { //overshot set value
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brightness = set_brightness;
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}
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flag_updatePWM=true; //force update
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}
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//Sleep
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if ( (!enable && enable_fadevalue>0) || (enable && enable_fadevalue<1) ) { //not fully turned off or on
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if (!enable) { //turn off
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enable_fadevalue-=enable_fadevalue_change_per_loop;
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}else{ //turn on
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enable_fadevalue+=enable_fadevalue_change_per_loop;
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}
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if (enable_fadevalue>1) { enable_fadevalue=1; } //limit
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if (enable_fadevalue<0) { enable_fadevalue=0; } //limit
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flag_updatePWM=true; //force update
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}
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//calculate and update pwm
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if (brightness != set_brightness || flag_updatePWM) { //if target not reached
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flag_updatePWM=false; // reset flag
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//calculate pwm values
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uint16_t pwm;
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pwm=pow((brightness*enable_fadevalue)/2.0, BRIGHTNESSCURVE) *2.0 *PWM_MAX; //calculate brightness for led stripe, scale to 0-1, ^2, rescale to 0-2, scale for pwm
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if (pwm>PWM_MAX) { pwm=PWM_MAX; } //limit
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analogWrite(LED_PWM, PWM_MAX-pwm); //full pwm is led off
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}
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}
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//send new values back to broker
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if (known_enable!=enable) {
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lightNode.setProperty("enable").send(enable ? "true" : "false");
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known_enable=enable;
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}
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if (known_set_brightness!=set_brightness) {
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lightNode.setProperty("brightness").send(String(set_brightness));
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known_set_brightness=set_brightness;
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}
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#ifdef DEBUG
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if (loopmillis >= last_debugupdatetime+DEBUGUPDATETIME ) {
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last_debugupdatetime = loopmillis;
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/*
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if (!enable) { Serial.print("not enable. "); }
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Serial.print("bright=");
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Serial.print(brightness);
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Serial.print(" set=");
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Serial.print(set_brightness);
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Serial.print("| temp=");
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Serial.print(temperature);
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Serial.print(" set=");
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Serial.print(set_temperature);
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Serial.print(" change=");
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Serial.print(brightness_change_per_loop);
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Serial.print(" enable_fadevalue=");
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Serial.println(enable_fadevalue);
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*/
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uint16_t pwmCW;
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uint16_t pwmWW;
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float temp=mapFloat(temperature, TEMPERATURE_MIN, TEMPERATURE_MAX, 0.0,1.0); //0=warmwhite, 1=coldwhite
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pwmCW=pow((brightness*enable_fadevalue)*temp/2.0, 2) *2.0 *PWM_MAX; //calculate brightness for led stripe, scale to 0-1, ^2, rescale to 0-2, scale for pwm
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pwmWW=pow((brightness*enable_fadevalue)*(1-temp)/2.0, 2) *2.0 *PWM_MAX;
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if (pwmCW>PWM_MAX) { pwmCW=PWM_MAX; } //limit
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if (pwmWW>PWM_MAX) { pwmWW=PWM_MAX; } //limit
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if (enable) {
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Serial.print("bright=");
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Serial.print(brightness);
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Serial.print(PWM_MAX-pwmWW);
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Serial.print(", ");
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Serial.println(PWM_MAX-pwmCW);
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}else{
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Serial.print("off");
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Serial.print(", ");
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Serial.println("off");
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}
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}
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#endif
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}
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bool brightnessHandler(const HomieRange& range, const String& value) {
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if (range.isRange) {
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return false; //if range is given but index is not in allowed range
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}
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Homie.getLogger() << "brightness " << ": " << value << endl;
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//lightNode.setProperty("brightness").send(value); //done in main loop
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if (value.toFloat() >= BRIGHTNESS_MIN && value.toFloat() <= BRIGHTNESS_MAX) {
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set_brightness=value.toFloat();
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}else {
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Homie.getLogger() << "Value outside range" << endl;
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return false;
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}
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float _difference=set_brightness-brightness;
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if (fadetime>0) {
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brightness_change_per_loop = _difference/fadetime*UPDATETIME;
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} else { //special case for instant change
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brightness_change_per_loop = _difference;
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}
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return true;
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}
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bool fadetimeHandler(const HomieRange& range, const String& value) { //fadetime for temperature and brightness in milliseconds
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if (range.isRange) {
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return false; //if range is given but index is not in allowed range
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}
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Homie.getLogger() << "fadetime " << ": " << value << endl;
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lightNode.setProperty("fadetime").send(value);
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if (value.toInt() >= FADETIME_MIN && value.toInt() <= FADETIME_MAX) {
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fadetime=value.toInt();
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}else {
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Homie.getLogger() << "Value outside range" << endl;
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return false;
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}
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return true;
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}
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bool enableHandler(const HomieRange& range, const String& value) { //change on off
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if (range.isRange) {
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return false; //if range is given but index is not in allowed range
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}
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Homie.getLogger() << "enable " << ": " << value << endl;
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//lightNode.setProperty("enable").send(value); //done in main loop
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if (value=="false") {
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enable=false;
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} else if(value=="true") {
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enable=true;
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} else {
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Homie.getLogger() << "Value outside range" << endl;
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return false;
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}
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flag_updatePWM=true; //force update
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return true;
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}
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float mapFloat(float x, float in_min, float in_max, float out_min, float out_max) {
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return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
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}
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