From 86705a30ea6424dfcc5fbb242a646976fbedb0d1 Mon Sep 17 00:00:00 2001
From: The Apple Chronicles <52100844+L-Delorme@users.noreply.github.com>
Date: Mon, 16 Nov 2020 15:58:12 +0100
Subject: [PATCH] Fan controller files

---
 Fan_Controller/QuadrATX_85/QuadrATX_85.ino    | 82 ++++++++++++++++
 .../QuadrATX_85_arduino.ino                   | 97 +++++++++++++++++++
 2 files changed, 179 insertions(+)
 create mode 100644 Fan_Controller/QuadrATX_85/QuadrATX_85.ino
 create mode 100644 Fan_Controller/QuadrATX_85_arduino/QuadrATX_85_arduino.ino

diff --git a/Fan_Controller/QuadrATX_85/QuadrATX_85.ino b/Fan_Controller/QuadrATX_85/QuadrATX_85.ino
new file mode 100644
index 0000000..6cd37a9
--- /dev/null
+++ b/Fan_Controller/QuadrATX_85/QuadrATX_85.ino
@@ -0,0 +1,82 @@
+// QuadrATX fan speed controller //
+//     The Apple Chronicles     //
+//            v0.45             //
+
+
+// NOTES:
+// set board to 8MHz!!!
+// configure Arduino as ISP
+
+
+// variables declaration
+int SensorPin = A1;  // pin 7
+int PWMPin = PB0;   // pin 5
+int PotPin = A2; // pin 3
+int LEDPin = PB1; // pin 6
+int SensorVal; // "temperature" from NTC
+int PWMVal;   // fan PWM output "speed"
+int PotVal;   // real potentiometer value, to define the cold/normal operation fan speed.
+int PotValmapped;  // lowest position shall correspond to the absolute minimum speed (see below) and not OFF, new potentiometer value
+int MinSpeed=64; // absolute minimum speed, 0=0% and 255=100%, currently set to 25%, corresponds to lowest pot value
+
+// Calibration variables
+int NTCcold=512; // corresponds to ambient temperature, 10K for a 10k NTC @25°C
+int NTChot=110; // corresponds to highest temperature before LED lights up, about 1.3K for a 10k NTC @80°C
+int PotMin=0; // corresponds to lowest position on potentiometer
+int PotMax=1023; // corresponds to highest position on potentiometer
+
+
+// setup code, to run once
+void setup() {
+
+  // avoid fan stall at startup
+  delay(1000); 
+  
+  //set PWM frequency of PB0 (Pin 5, ATTiny85, fan output) to 31,250 Hz.
+  TCCR0B = TCCR0B & 0b11111000 | 0b001;
+
+  // define pin modes ATTiny85
+  pinMode(SensorPin, INPUT);
+  pinMode(PotPin, INPUT);
+  pinMode(PWMPin, OUTPUT);
+  pinMode(LEDPin, OUTPUT);
+
+  // Set fan to full speed for one second at startup (prevents stall)
+  analogWrite(PWMPin, 255);
+  
+  delay(1200);
+}
+
+
+// main code, to run repeatedly
+void loop() {
+
+  //read NTC sensor value
+  SensorVal = analogRead(SensorPin);
+   if( (SensorVal > NTCcold) && (SensorVal < 1000) ){ // in case ambient temperature is lower than 25°C
+    SensorVal = NTCcold;} 
+   if( (SensorVal > NTCcold) && (SensorVal > 1000) ){ // NTC failure (open circuit)
+    SensorVal = NTChot-1;} 
+  
+  //read pot value
+  PotVal = analogRead(PotPin);
+
+  // map and assign pot/pwm values. 0 to 255 corresponds to 0 to 100%
+  PotValmapped = map(PotVal, PotMin, PotMax, MinSpeed, 254); // change potentiometer characteristic, lowest position corresponds to absolute minimum speed
+  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
+
+  // Overheating indicator
+  if (SensorVal<NTChot){ 
+    PWMVal=255; // full speed
+    digitalWrite(LEDPin, HIGH); // LED ON
+  }
+  else {
+    digitalWrite(LEDPin, LOW); // LED OFF
+  }
+
+  //write the PWM value to the pwm output pin
+  analogWrite(PWMPin, PWMVal);
+
+  delay(1000); // updates every second
+
+}
diff --git a/Fan_Controller/QuadrATX_85_arduino/QuadrATX_85_arduino.ino b/Fan_Controller/QuadrATX_85_arduino/QuadrATX_85_arduino.ino
new file mode 100644
index 0000000..945ba3c
--- /dev/null
+++ b/Fan_Controller/QuadrATX_85_arduino/QuadrATX_85_arduino.ino
@@ -0,0 +1,97 @@
+// QuadrATX fan speed controller //
+//     The Apple Chronicles     //
+//           v0.30A            //
+
+
+// NOTES:
+// arduino version
+
+
+// variables declaration
+int SensorPin = A0;  // pin 7
+int PWMPin = 3;   // pin 5
+int PotPin = A1; // pin 3
+int LEDPin = 8; // pin 6
+//int SpeedPin = PB3; // pin 2
+int SensorVal; // "temperature" from NTC
+int PWMVal;   // fan PWM output "speed"
+int PotVal;   // real potentiometer value, to define the cold/normal operation fan speed.
+int PotValmapped;  // lowest position shall correspond to the absolute minimum speed (see below) and not OFF, new potentiometer value
+int MinSpeed=64; // absolute minimum speed, 0=0% and 255=100%, currently set to 25%, corresponds to lowest pot value
+
+// Calibration variables
+int NTCcold=512; // corresponds to ambient temperature, 10K for a 10k NTC @25°C
+int NTChot=110; // corresponds to highest temperature before LED lights up, about 1.3K for a 10k NTC @80°C
+int PotMin=0; // corresponds to lowest position on potentiometer
+int PotMax=1023; // corresponds to highest position on potentiometer
+
+
+// setup code, to run once
+void setup() {
+  // set PWM frequency of PB0 (Pin 5, ATTiny85, fan output) to 31,250 Hz.
+  //TCCR0B = TCCR0B & 0b11111000 | 0b001;
+
+  // define pin modes ATTiny85
+  pinMode(SensorPin, INPUT);
+  pinMode(PotPin, INPUT);
+  pinMode(PWMPin, OUTPUT);
+  pinMode(LEDPin, OUTPUT);
+  //pinMode(SpeedPin, OUTPUT);
+
+  Serial.begin(9600);
+
+  // Set fan to full speed for one second at startup (prevents stall)
+  analogWrite(PWMPin, 255);
+  
+  delay(1000);
+}
+
+
+// main code, to run repeatedly
+void loop() {
+
+  //read NTC sensor value
+  SensorVal = analogRead(SensorPin);
+   if( (SensorVal > NTCcold) && (SensorVal < 1000) ){ // in case ambient temperature is lower than 25°C
+    SensorVal = NTCcold;} 
+   if( (SensorVal > NTCcold) && (SensorVal > 1000) ){ // NTC failure (open circuit)
+    SensorVal = NTChot-1;} 
+  
+  //read pot value
+  PotVal = analogRead(PotPin);
+
+  // map and assign pot/pwm values. 0 to 255 corresponds to 0 to 100%
+  PotValmapped = map(PotVal, PotMin, PotMax, MinSpeed, 254); // change potentiometer characteristic, lowest position corresponds to absolute minimum speed
+  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
+
+  // Overheating indicator
+  if (SensorVal<NTChot){ ///////////////////////// ATTENTION
+    PWMVal=255; // full speed
+    digitalWrite(LEDPin, HIGH); // LED ON
+  }
+  else {
+    digitalWrite(LEDPin, LOW); // LED OFF
+  }
+
+  //write the PWM value to the pwm output pin
+  analogWrite(PWMPin, PWMVal);
+
+  //basic RPM indicator
+  //analogWrite(SpeedPin, PWMVal);
+
+    // CONSOLE
+  Serial.println("NTC Value");
+  Serial.println(SensorVal);
+  Serial.println(" "); // carriage return
+  Serial.println("Pot Value");
+  Serial.println(PotVal);
+  Serial.println(" "); // carriage return
+  Serial.println("Pot mapped");
+  Serial.println(PotValmapped);
+  Serial.println(" "); // carriage return
+  Serial.println("PWMVAL");
+  Serial.println(PWMVal);
+  Serial.println(" "); // carriage return
+  delay(1000); // console and serial will be removed for final release.
+
+}