Hi guys,
I am looking for help regarding a temperature control circuit I made for controlling temperature within a chamber. Here is how i built the circuit: mains power comes into a 12v transformer. out of the dc side of the transformer the + goes to the com2 port of a 2 channel relay and the - goes to the - of the fan. the + of the fan goes to the NO2 port of the relay. the yellow of the fan goes to pin 2 of the arduino and the blue wire of the fan goes to pin 9 of the arduino. the mains L is looped from the trnsformer to COM1 port of the relay and the mains N is looped to the - of the heater. the plus of the heater is connected to the NO1 of the relay. the +5v of the arduino is connected to the + rail of a breadboard. the gnd of the arduino is connected to the - rail of the breadboard. connected to the + rail of the breadboard is the vcc of the relay, the + of the temp sensor and the + side of a 100uF capacitor. connected to - rail of the breadboard is the gnd of the relay, the gnd of the temp sensor and the - leg of the capacitor. the analogue output of the temp sensor is connected to A0 of the arduino. sig1 of the relay is connected to pin 7 of the arduino. sig2 of the relay is connected to pin 5 of the arduino.
I have the circuit running fine with the following arduino code:
const int relayHeaterPin = 5;
const int relayFanPin = 7;
const int fanPin = 9;
const int tempPin = A0;
int fanSpeed = 0;
float tempSetpointLow = 16.0; // Temperature setpoint for heater activation
float tempSetpointHigh = 30.0; // Temperature setpoint for fan speed increase
void setup() {
pinMode(relayHeaterPin, OUTPUT);
pinMode(relayFanPin, OUTPUT);
pinMode(fanPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
float temperature = getTemperature();
Serial.print("Temperature: ");
Serial.print(temperature);
Serial.println(" C");
if (temperature < tempSetpointLow) {
digitalWrite(relayHeaterPin, HIGH); // Turn on the heater
digitalWrite(relayFanPin, HIGH); // Turn on the fan relay
fanSpeed = 20; // Set fan speed to a lower value
Serial.println("Heater is ON");
Serial.println("Fan is ON (Low Speed)");
} else if (temperature >= tempSetpointLow && temperature <= tempSetpointHigh) {
digitalWrite(relayHeaterPin, HIGH); // Turn off the heater relay
digitalWrite(relayFanPin, HIGH); // Turn on the fan relay
fanSpeed = 20; // Set fan speed to a medium value
Serial.println("Heater is ON");
Serial.println("Fan is ON (Medium Speed)");
} else if (temperature > tempSetpointHigh) {
digitalWrite(relayHeaterPin, LOW); // Turn off the heater relay
digitalWrite(relayFanPin, HIGH); // Turn on the fan relay
fanSpeed = 50; // Set fan speed to a higher value
Serial.println("Heater is OFF");
Serial.println("Fan is ON (High Speed)");
}
analogWrite(fanPin, fanSpeed);
delay(1000); // Wait for 1 second
}
float getTemperature() {
int tempReading = analogRead(tempPin);
float tempVoltage = tempReading * 5.0 / 1023.0;
float temperature = (tempVoltage - 0.5) * 100.0;
return temperature;
}
I would like to:
A: Recreate the circuit using the linx toolkit that i have installed.
OR
B: Run the circuit using the arduino code and simply use labview as a visual for representing the current temperature and also the current heater and fan status. (I have attached an attempt i made at this)
I have tried both and have been completely unsuccessful. If any could help that would be great, thanks.
