Cooling fan sim

[Mnemonics101]

Here you will see the cooling fan simulation using and Arduino uno a transistor and a mini motor with fan blades

//CONFIG =====================================================================================
#define aref_voltage 3.3 // we tie 3.3V to ARef and measure it with a multimeter!

//TMP36 Pin Variables
int tempPin = 0; // TMP36 Center lead to Analog Pin [A1-A7] (Elegoo Nano v.3)
int tempReading; // the analog reading from the sensor

//Relay Pin Variable
int relayPin = 2; // Relay Singnal lead to Digital Pin [D2-D12] (Elegoo Nano v.3)

//Tempurature Range
// Its good to provide a buffer for efficiency, if the temp bounces from 79-81 constantly
// it will turn on and off the fan constantly. So set a minimum temperature that the fan
// can cool the are too before it starts checking for max temperature.

float maxTemperature = 80.00; // The Max Temperature allowed
float minTemperature = 75.00; // The Min Temperature allowed

//=============================================================================================
void setup() {
// We’ll send debugging information via the Serial monitor
Serial.begin(9600);

// If you want to set the aref to something other than 5v
analogReference(EXTERNAL); // Feed the 3.3v cable back into the AREF pin

// Pin Setup/Register
pinMode(relayPin, OUTPUT);
}

void loop() {
// put your main code here, to run repeatedly:
float temperature = getTemperature();
if(temperature >= maxTemperature){
powerOnRelay();
} else if (temperature <= minTemperature) { powerOffRelay(); } delay(1000); // Check tempertature every second } void powerOnRelay() { digitalWrite(relayPin, HIGH); Serial.println("Relay On"); } void powerOffRelay() { digitalWrite(relayPin, LOW); Serial.println("Relay Off"); } float getTemperature(){ tempReading = analogRead(tempPin); float voltage = tempReading * aref_voltage; voltage /= 1024.0; // now print out the temperature float temperatureC = (voltage - 0.5) * 100 ; //converting from 10 mv per degree wit 500 mV offset to degrees ((volatge - 500mV) times 100) //Serial.print(temperatureC); Serial.println(" degrees C"); // For debuging purpouses // now convert to Fahrenheight float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0; Serial.print(temperatureF); Serial.println(" degrees F"); // Choose which tempurature you would like to use. return temperatureF; //Fahrenheight //return temperatureC; // Celcius }

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