Fan controller files
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The Apple Chronicles
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// QuadrATX fan speed controller //
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// The Apple Chronicles //
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// v0.45 //
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// NOTES:
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// set board to 8MHz!!!
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// configure Arduino as ISP
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// variables declaration
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int SensorPin = A1; // pin 7
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int PWMPin = PB0; // pin 5
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int PotPin = A2; // pin 3
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int LEDPin = PB1; // pin 6
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int SensorVal; // "temperature" from NTC
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int PWMVal; // fan PWM output "speed"
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int PotVal; // real potentiometer value, to define the cold/normal operation fan speed.
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int PotValmapped; // lowest position shall correspond to the absolute minimum speed (see below) and not OFF, new potentiometer value
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int MinSpeed=64; // absolute minimum speed, 0=0% and 255=100%, currently set to 25%, corresponds to lowest pot value
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// Calibration variables
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int NTCcold=512; // corresponds to ambient temperature, 10K for a 10k NTC @25°C
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int NTChot=110; // corresponds to highest temperature before LED lights up, about 1.3K for a 10k NTC @80°C
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int PotMin=0; // corresponds to lowest position on potentiometer
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int PotMax=1023; // corresponds to highest position on potentiometer
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// setup code, to run once
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void setup() {
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// avoid fan stall at startup
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delay(1000);
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//set PWM frequency of PB0 (Pin 5, ATTiny85, fan output) to 31,250 Hz.
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TCCR0B = TCCR0B & 0b11111000 | 0b001;
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// define pin modes ATTiny85
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pinMode(SensorPin, INPUT);
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pinMode(PotPin, INPUT);
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pinMode(PWMPin, OUTPUT);
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pinMode(LEDPin, OUTPUT);
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// Set fan to full speed for one second at startup (prevents stall)
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analogWrite(PWMPin, 255);
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delay(1200);
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}
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// main code, to run repeatedly
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void loop() {
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//read NTC sensor value
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SensorVal = analogRead(SensorPin);
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if( (SensorVal > NTCcold) && (SensorVal < 1000) ){ // in case ambient temperature is lower than 25°C
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SensorVal = NTCcold;}
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if( (SensorVal > NTCcold) && (SensorVal > 1000) ){ // NTC failure (open circuit)
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SensorVal = NTChot-1;}
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//read pot value
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PotVal = analogRead(PotPin);
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// map and assign pot/pwm values. 0 to 255 corresponds to 0 to 100%
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PotValmapped = map(PotVal, PotMin, PotMax, MinSpeed, 254); // change potentiometer characteristic, lowest position corresponds to absolute minimum speed
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PWMVal = map(SensorVal, NTCcold, NTChot, PotValmapped, 255); // linear fan curve from ambient to LED lighting up. PotValmapped is the minimum fan speed set by the potentiometer
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// Overheating indicator
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if (SensorVal<NTChot){
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PWMVal=255; // full speed
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digitalWrite(LEDPin, HIGH); // LED ON
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}
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else {
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digitalWrite(LEDPin, LOW); // LED OFF
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}
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//write the PWM value to the pwm output pin
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analogWrite(PWMPin, PWMVal);
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delay(1000); // updates every second
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}
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@ -0,0 +1,97 @@
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// QuadrATX fan speed controller //
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// The Apple Chronicles //
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// v0.30A //
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// NOTES:
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// arduino version
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// variables declaration
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int SensorPin = A0; // pin 7
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int PWMPin = 3; // pin 5
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int PotPin = A1; // pin 3
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int LEDPin = 8; // pin 6
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//int SpeedPin = PB3; // pin 2
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int SensorVal; // "temperature" from NTC
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int PWMVal; // fan PWM output "speed"
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int PotVal; // real potentiometer value, to define the cold/normal operation fan speed.
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int PotValmapped; // lowest position shall correspond to the absolute minimum speed (see below) and not OFF, new potentiometer value
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int MinSpeed=64; // absolute minimum speed, 0=0% and 255=100%, currently set to 25%, corresponds to lowest pot value
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// Calibration variables
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int NTCcold=512; // corresponds to ambient temperature, 10K for a 10k NTC @25°C
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int NTChot=110; // corresponds to highest temperature before LED lights up, about 1.3K for a 10k NTC @80°C
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int PotMin=0; // corresponds to lowest position on potentiometer
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int PotMax=1023; // corresponds to highest position on potentiometer
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// setup code, to run once
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void setup() {
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// set PWM frequency of PB0 (Pin 5, ATTiny85, fan output) to 31,250 Hz.
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//TCCR0B = TCCR0B & 0b11111000 | 0b001;
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// define pin modes ATTiny85
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pinMode(SensorPin, INPUT);
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pinMode(PotPin, INPUT);
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pinMode(PWMPin, OUTPUT);
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pinMode(LEDPin, OUTPUT);
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//pinMode(SpeedPin, OUTPUT);
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Serial.begin(9600);
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// Set fan to full speed for one second at startup (prevents stall)
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analogWrite(PWMPin, 255);
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delay(1000);
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}
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// main code, to run repeatedly
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void loop() {
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//read NTC sensor value
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SensorVal = analogRead(SensorPin);
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if( (SensorVal > NTCcold) && (SensorVal < 1000) ){ // in case ambient temperature is lower than 25°C
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SensorVal = NTCcold;}
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if( (SensorVal > NTCcold) && (SensorVal > 1000) ){ // NTC failure (open circuit)
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SensorVal = NTChot-1;}
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//read pot value
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PotVal = analogRead(PotPin);
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// map and assign pot/pwm values. 0 to 255 corresponds to 0 to 100%
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PotValmapped = map(PotVal, PotMin, PotMax, MinSpeed, 254); // change potentiometer characteristic, lowest position corresponds to absolute minimum speed
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PWMVal = map(SensorVal, NTCcold, NTChot, PotValmapped, 255); // linear fan curve from ambient to LED lighting up. PotValmapped is the minimum fan speed set by the potentiometer
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// Overheating indicator
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if (SensorVal<NTChot){ ///////////////////////// ATTENTION
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PWMVal=255; // full speed
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digitalWrite(LEDPin, HIGH); // LED ON
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}
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else {
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digitalWrite(LEDPin, LOW); // LED OFF
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}
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//write the PWM value to the pwm output pin
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analogWrite(PWMPin, PWMVal);
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//basic RPM indicator
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//analogWrite(SpeedPin, PWMVal);
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// CONSOLE
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Serial.println("NTC Value");
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Serial.println(SensorVal);
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Serial.println(" "); // carriage return
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Serial.println("Pot Value");
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Serial.println(PotVal);
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Serial.println(" "); // carriage return
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Serial.println("Pot mapped");
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Serial.println(PotValmapped);
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Serial.println(" "); // carriage return
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Serial.println("PWMVAL");
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Serial.println(PWMVal);
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Serial.println(" "); // carriage return
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delay(1000); // console and serial will be removed for final release.
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}
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