Create ds1822-temperaturecontrol.ino

Author: beniroquai

ESP32/ds1822-temperaturecontrol/ds1822-temperaturecontrol.ino

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+#include <OneWire.h>
+#include <DallasTemperature.h>
+#include <Arduino.h>
+
+// GPIO where the DS18B20 is connected to
+const int oneWireBus = GPIO_NUM_25;     
+
+
+ int8_t LASER_1 = GPIO_NUM_12;
+ int8_t LASER_2 = GPIO_NUM_4;
+ int8_t LASER_3 = GPIO_NUM_2;
+     
+
+// Setup a oneWire instance to communicate with any OneWire devices
+OneWire oneWire(oneWireBus);
+
+// Pass our oneWire reference to Dallas Temperature sensor 
+DallasTemperature sensors(&oneWire);
+
+// PID constants
+const float Kp = 2.0;
+const float Ki = 0.5;
+const float Kd = 1.0;
+
+// PID variables
+float previousError = 0;
+float integral = 0;
+
+// Desired temperature
+const float setpoint = 30.0;  // for example, 50°C
+
+// LEDC variables
+const int freq = 5000;
+const int ledChannel = 0;
+const int resolution = 8;
+const int heaterPin = 27;  // PWM pin connected to the heater
+
+// Get the current temperature
+// Here you'll want to replace this with your actual temperature reading logic
+float getTemperature() {
+  // Dummy implementation, replace with your sensor's logic
+  sensors.requestTemperatures(); 
+  return sensors.getTempCByIndex(0);  
+}
+
+void setup() {
+  Serial.begin(115200);
+  sensors.begin();
+  // Setup LEDC for heater control
+  ledcSetup(ledChannel, freq, resolution);
+  ledcAttachPin(heaterPin, ledChannel);
+}
+
+void loop() {
+
+  float currentTemperature = getTemperature();
+  float error = setpoint - currentTemperature;
+
+  integral += error;
+  float derivative = error - previousError;
+
+  // Calculate PID output
+  float output = Kp * error + Ki * integral + Kd * derivative;
+
+  // Ensure output is within the range [0, 255] for the 8-bit PWM resolution
+  output = constrain(output, 0, 255);
+
+  // Set the PWM signal
+  ledcWrite(ledChannel, (int)output);
+
+  // Update the previous error
+  previousError = error;
+
+  // Print values for debugging (optional)
+  Serial.print("Current Temperature: "); Serial.print(currentTemperature);
+  Serial.print(" °C | PWM Output: "); Serial.println(output);
+
+  delay(1000);
+}