105 lines
4.4 KiB
C++
105 lines
4.4 KiB
C++
// temperaturedimmer : AC Light Dimmer Module with DS18B20 temperature sensor changes gradually changing
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// of AC power (useful for infrared ceramic heating bulbs). Note maxtemp and mintemp variables, in this
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// range, the dimmer is working at partially power gradient-like. Reads temperature every minute, changes
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// of dimming - 3 times per minute.
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#include <OneWire.h>
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#include <DallasTemperature.h>
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#include <Thread.h>
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#define ONE_WIRE_BUS 6 // Temperature senson DS18B20 signal pin
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OneWire oneWire(ONE_WIRE_BUS);
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DallasTemperature sensors(&oneWire);
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bool serialshow = true; // Enable/disable serial output
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int currenttemp = -127; // -127 - means sensor can't gain temperature data
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int dimmerpin = 10; // Dimmer Digital PWM pin
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int dimming = 128; // Dimming level (0-128) 0 = FULL ON, 128 = OFF
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// 4-128 is recommended range (4 is maximum)
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int maxtemp = 24; // Maximum temperature - dimmer works at minimum power
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// if above maxtemp, dimmer not working
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int mintemp = 21; // Minumum temperature (or less) - dimmer works at maximum power
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// Threads:
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Thread checkTempThread = Thread(); // Thread for temperature state checking
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Thread changeDimmerThread = Thread(); // Thread for dimmer level changing
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void setup() {
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if (serialshow) {
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Serial.begin(9600); // Initializes the Serial connection @ 9600 baud for debug
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Serial.println("start");
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}
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pinMode(LED_BUILTIN, OUTPUT); // Initializes builtin LED
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digitalWrite(LED_BUILTIN, HIGH);
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pinMode(dimmerpin, OUTPUT); // Set the AC Load as output
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attachInterrupt(0, zero_cross_int, RISING); // Choose the zero cross interrupt # from the table above
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sensors.begin();
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// Warning! zero_cross_int with sensors changes internal time,
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// so digital 1000ms ~ physical 7100ms on Arduino Uno
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checkTempThread.onRun(checkTemp);
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checkTempThread.setInterval(8450); // Interval for checking temperature ~60sec
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changeDimmerThread.onRun(changeDimmer);
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changeDimmerThread.setInterval(2800); // Interval for change dimmer state ~20sec
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checkTemp();
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}
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// zero_cross_int function from http://electronics.stackexchange.com/q/59615
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// the interrupt function must take no parameters and return nothing
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void zero_cross_int() { // function to be fired at the zero crossing to dim the light
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// Firing angle calculation : 1 full 50Hz wave =1/50=20ms
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// Every zerocrossing thus: (50Hz)-> 10ms (1/2 Cycle)
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// For 60Hz => 8.33ms (10.000/120)
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// 10ms=10000us
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// (10000us - 10us) / 128 = 75 (Approx) For 60Hz =>65
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int dimtime = (75*dimming); // For 60Hz =>65
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delayMicroseconds(dimtime); // Wait till firing the TRIAC
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digitalWrite(dimmerpin, HIGH); // Fire the TRIAC
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delayMicroseconds(10); // triac On propogation delay (for 60Hz use 8.33)
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digitalWrite(dimmerpin, LOW); // No longer trigger the TRIAC (the next zero crossing will swith it off) TRIAC
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}
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void loop() {
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digitalWrite(LED_BUILTIN, LOW);
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// Threads init:
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if (checkTempThread.shouldRun())
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checkTempThread.run();
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if (changeDimmerThread.shouldRun())
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changeDimmerThread.run();
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}
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void checkTemp() {
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sensors.requestTemperatures();
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currenttemp = int(sensors.getTempCByIndex(0));
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if (serialshow) {
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long currentTime = millis();
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String tempString = currentTime + String(" temp: ")+ currenttemp;
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Serial.println(tempString);
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}
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}
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void changeDimmer() {
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if (currenttemp != -127) {
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if (currenttemp <= mintemp)
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if (dimming > 4) dimming = dimming - 1;
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if (currenttemp > maxtemp)
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if (dimming < 128) dimming = dimming + 1;
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if ((mintemp < currenttemp) and (currenttemp <= maxtemp)) {
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int dimlevel = (124 / (maxtemp - mintemp)) * (currenttemp - mintemp);
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if (dimming < dimlevel)
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dimming = dimming + 1;
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if (dimming > dimlevel)
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dimming = dimming - 1;
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}
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} else {
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if (dimming < 128) dimming = dimming + 1;
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if (serialshow) {
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long currentTime = millis();
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String tempString = currentTime + String(" can't get temp data");
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Serial.println(tempString);
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}
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// LED blinking is indication of temperature sensor failure
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for (int i=1; i <= 10; i++) {
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digitalWrite(LED_BUILTIN, HIGH);
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delay(10);
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digitalWrite(LED_BUILTIN, LOW);
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delay(20);
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}
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}
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}
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