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- //Soldering station Software using PID
- //Thank you Alex from https://geektimes.ru/ for help with led array function
- //AllAboutCircuits.com
- //epilepsynerd.wordpress.com
- #include <PID_v1.h>
- #include <PCD8544.h>
- PCD8544 lcd;
- unsigned long updaterate = 500; //Change how fast the display updates. No lower than 500
- unsigned long lastupdate;
- int temperature = 0;
- //Define Variables we'll be connecting to
- double Setpoint, Input, Output;
- //Define the aggressive and conservative Tuning Parameters
- double aggKp = 4, aggKi = 0.2, aggKd = 1;
- double consKp = 1, consKi = 0.05, consKd = 0.25;
- //Specify the links and initial tuning parameters
- PID myPID(&Input, &Output, &Setpoint, consKp, consKi, consKd, DIRECT);
- void setup()
- {
- lcd.begin(84, 48);
- //We do not want to drive the soldering iron at 100% because it may burn, so we set it to about 85% (220/255)
- myPID.SetOutputLimits(0, 220);
- myPID.SetMode(AUTOMATIC);
- lastupdate = millis();
- Setpoint = 0;
- }
- void loop() {
- lcd.clear();
- //Read temperature
- Input = analogRead(0);
- //Transform the 10bit reading into degrees celsius
- Input = map(Input, 0, 450, 25, 350);
- //Display temperature
- if (millis() - lastupdate > updaterate) {
- lastupdate = millis();
- temperature = Input;
- }
- //Read setpoint and transform it into degrees celsius(minimum 150, maximum 350)
- double newSetpoint = analogRead(1);
- newSetpoint = map(newSetpoint, 0, 1023, 150, 350);
- //Display setpoint
- if (abs(newSetpoint - Setpoint) > 3) {
- Setpoint = newSetpoint;
- temperature = newSetpoint;
- lastupdate = millis();
- }
- double gap = abs(Setpoint - Input); //distance away from setpoint
- if (gap < 10)
- { //we're close to setpoint, use conservative tuning parameters
- myPID.SetTunings(consKp, consKi, consKd);
- }
- else
- {
- //we're far from setpoint, use aggressive tuning parameters
- myPID.SetTunings(aggKp, aggKi, aggKd);
- }
- myPID.Compute();
- //Drive the output
- analogWrite(11, Output);
- //Display the temperature
- show(temperature, newSetpoint);
- }
- void show(int value, int newspnt) {
- lcd.setCursor(0, 0);
- lcd.print("READ TEMP");
- lcd.setCursor(0, 1);
- lcd.print(value);
- lcd.setCursor(0, 2);
- lcd.print("SET TEMP");
- lcd.setCursor(0, 3);
- lcd.print(newspnt);
- delay(200);
- }
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