Safer Touch input, mains interference compensation...

rin67630
Posts: 58
Joined: Sun Mar 11, 2018 5:13 pm

Safer Touch input, mains interference compensation...

Postby rin67630 » Fri Apr 13, 2018 12:17 pm

The TouchInput of the ESP32 isn't exactly reliable unless you design the touchfields thoroughly with proper shielding.

If you are using -like me- board-pins soldered on a pcb breadboard you might get trouble with mains interference.
It helps to make a second read half a period later (10mS with 50Hz mains frequency, 8mS with a 60Hz mains frequency).
So interference from your mains power will be eliminated.


This way to check the touch inputs helps:

Code: Select all


byte mainScreen;
byte subScreen;
byte maxScreens[] = {3, 15, 25, 13}; //3 mainScreens, mainScreen1 has 15 subscreens, mainScreen2 has 25 subscreens ...
...
// part processed in a on second loop
  // Menu processing.
  if (touchRead(T3) < 15)   // increase screen #
  {
    delay(10);      if (touchRead(T3) < 15)
    {
      if ( mainScreen < maxScreens[0]) mainScreen ++;
      subScreen = 0;
    }
  }
  if (touchRead(T5) < 15) //  decrease screen #
  {
    delay(10);
    if (touchRead(T5) < 15)
    {
      if ( mainScreen >= 1) mainScreen --;
      subScreen = 0;
    }
  }
  if (touchRead(T6) < 15) // increase subscreen #
  {
    delay(10);
    if (touchRead(T6) < 15)
    {
      if (subScreen < maxScreens[mainScreen]) subScreen ++;

    }
  }
  if (touchRead(T4) < 15)
  {
    delay(10);
    if (touchRead(T4) < 15) // decrease subscreen #
    {
      if (subScreen >= 1) subScreen --;
    }
  }


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