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esp32_phase_dimmer.ino
executable file
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esp32_phase_dimmer.ino
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#include <WiFi.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
const char* ssid = "YOUR WIFI SSID";
const char* password = "YOUR WIFI PASSWORD";
const char* mqtt_server = "broker.mqtt-dashboard.com";
const char* topic = "smartfan/456787654";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
unsigned char PWM = 23; // Output to Opto Triac pin
unsigned char ZEROCROSS = 4; // Output to Opto Triac pin
unsigned char dimming = 0; // Dimming level (0-100)
unsigned char i;
boolean enable = false;
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
String msg = "";
for (int i = 0; i < length; i++) {
msg += (char)payload[i];
}
Serial.println(msg);
// set dimming variable in function of speed is received
if (msg == "stop" || msg == "0") {
enable = false;
} else {
dimming = (11 - msg.toInt()) * 5;
enable = true;
}
Serial.print("dimming: ");
Serial.println(dimming);
Serial.print("enable: ");
Serial.println(enable);
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "ESP32Client-";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str())) {
Serial.println("connected");
client.subscribe(topic);
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup() {
Serial.begin(115200);
// put your setup code here, to run once:
pinMode(PWM, OUTPUT);// Set AC Load pin as output
pinMode(ZEROCROSS, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(ZEROCROSS), zero_crosss_int, RISING);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void zero_crosss_int() // function to be fired at the zero crossing to dim the light
{
// Firing angle calculation : 1 full 50Hz wave =1/50=20ms
// Every zerocrossing : (50Hz)-> 10ms (1/2 Cycle) For 60Hz (1/2 Cycle) => 8.33ms
// 10ms=10000us
digitalWrite(2, HIGH); // Turn the LED on (Note that LOW is the voltage level
if (enable) {
int dimtime = (100*dimming); // For 60Hz =>65
delayMicroseconds(dimtime); // Off cycle
digitalWrite(PWM, HIGH); // triac firing
delayMicroseconds(20); // triac On propogation delay (for 60Hz use 8.33)
digitalWrite(PWM, LOW); // triac Off
}
}
void loop() {
if (!client.connected()) {
reconnect();
}
else {
client.loop();
}
}