Simple ESP32 touch calibration for changing environment

[reddomon]

We can calculate the threshold value and different capacitance value due to changing environment. For example if you place 3 mm plastic plate onto the touch pad and restart the calibrate code esp32 recalculate the environment capacitance value.

Code: [Select all] [Expand/Collapse]

1.  
2. //touch pad defs
3. #define TOUCHPIN T8
4. #define REPEAT 32
5. #define DELAYTOUCHREPEAT 5
6.  
7. void calibrateTouch(){
8.  
9.     int  touch = 0,totalValue = 0;
10.    //calculate the avarage value
11.     for(int counter = 0;counter < REPEAT ;counter++){
12.       //noise delay
13.       delay(DELAYTOUCHREPEAT);
14.       touch = touchRead(T8);
15.       totalValue += touch;
16.      //debugging purposes
17.       Serial.println(touch);
18.       }
19.  
20.     touchTehreshold = totalValue/REPEAT;
21.     Serial.println(touchTehreshold);
22.      
23.  
24.  
25. }

GeSHi © Codebox Plus Extension