Add ESP32 touch sensors as button alternative (#1190)

* Add touch option to button handler

* Check if touch is pressed in setup

* Add TOUCHPIN build env and override example

Co-authored-by: Aircoookie <dev.aircoookie@gmail.com>

platformio.ini

@@ -334,6 +334,14 @@ lib_ignore =
   ESPAsyncTCP
   ESPAsyncUDP
 
+[env:custom32_TOUCHPIN_T0]
+board = esp32dev
+platform = espressif32@1.12.4
+build_flags = ${common.build_flags_esp32} -D TOUCHPIN=T0
+lib_ignore =
+  ESPAsyncTCP
+  ESPAsyncUDP
+
 [env:wemos_shield_esp32]
 board = esp32dev
 platform = espressif32@1.12.4

platformio_override.ini.example

@@ -21,6 +21,7 @@ build_flags = ${common.build_flags_esp8266}
 ; PIN defines - uncomment and change, if needed:
 ;   -D LEDPIN=2
 ;   -D BTNPIN=0
+;   -D TOUCHPIN=T0
 ;   -D IR_PIN=4
 ;   -D RLYPIN=12
 ;   -D RLYMDE=1

wled00/button.cpp

@@ -15,13 +15,24 @@ void shortPressAction()
   }
 }
 
+bool isButtonPressed()
+{
+  #ifdef BTNPIN
+    if (digitalRead(BTNPIN) == LOW) return true;
+  #endif
+  #ifdef TOUCHPIN
+    if (touchRead(TOUCHPIN) <= TOUCH_THRESHOLD) return true;
+  #endif
+  return false;
+}
+
 
 void handleButton()
 {
-#ifdef BTNPIN
+#if defined(BTNPIN) || defined(TOUCHPIN)
   if (!buttonEnabled) return;
-  
-  if (digitalRead(BTNPIN) == LOW) //pressed
+
+  if (isButtonPressed()) //pressed
   {
     if (!buttonPressedBefore) buttonPressedTime = millis();
     buttonPressedBefore = true;
@@ -37,7 +48,7 @@ void handleButton()
       }
     }
   }
-  else if (digitalRead(BTNPIN) == HIGH && buttonPressedBefore) //released
+  else if (!isButtonPressed() && buttonPressedBefore) //released
   {
     long dur = millis() - buttonPressedTime;
     if (dur < 50) {buttonPressedBefore = false; return;} //too short "press", debounce

wled00/const.h

@@ -126,6 +126,8 @@
 
 #define ABL_MILLIAMPS_DEFAULT 850; // auto lower brightness to stay close to milliampere limit
 
+#define TOUCH_THRESHOLD 32 // limit to recognize a touch, higher value means more sensitive
+
 // Size of buffer for API JSON object (increase for more segments)
 #ifdef ESP8266
   #define JSON_BUFFER_SIZE 9216

wled00/fcn_declare.h

@@ -21,6 +21,7 @@ void updateBlynk();
 
 //button.cpp
 void shortPressAction();
+bool isButtonPressed();
 void handleButton();
 void handleIO();
 

wled00/wled.cpp

@@ -250,8 +250,8 @@ void WLED::beginStrip()
 #endif
 
   // disable button if it is "pressed" unintentionally
-#ifdef BTNPIN
-  if (digitalRead(BTNPIN) == LOW)
+#if defined(BTNPIN) || defined(TOUCHPIN)
+  if (isButtonPressed())
     buttonEnabled = false;
 #else
   buttonEnabled = false;