Touch pin as button for ESP32

tasmota/support_button.ino

@@ -24,6 +24,10 @@
 \*********************************************************************************************/
 
 #define MAX_RELAY_BUTTON1       5  // Max number of relay controlled by BUTTON1
+#ifdef ESP32
+#define TOUCH_PIN_THRESHOLD     12 // Smaller value will treated as button press
+#define TOUCH_HIT_THRESHOLD     3  // successful hits to filter out noise
+#endif // ESP32
 
 const char kMultiPress[] PROGMEM =
   "|SINGLE|DOUBLE|TRIPLE|QUAD|PENTA|";
@@ -40,6 +44,10 @@ struct BUTTON {
   uint8_t dual_receive_count = 0;            // Sonoff dual input flag
   uint8_t no_pullup_mask = 0;                // key no pullup flag (1 = no pullup)
   uint8_t inverted_mask = 0;                 // Key inverted flag (1 = inverted)
+#ifdef ESP32  
+  uint8_t touch_mask = 0;                    // Touch flag (1 = inverted)
+  uint8_t touch_hits[MAX_KEYS] = { 0 };      // Hits in a row to filter out noise
+#endif // ESP32
   uint8_t present = 0;                       // Number of buttons found flag
   uint8_t adc = 99;                          // ADC0 button number
 } Button;
@@ -55,7 +63,12 @@ void ButtonInvertFlag(uint8 button_bit)
 {
   bitSet(Button.inverted_mask, button_bit);
 }
-
+#ifdef ESP32
+void ButtonTouchFlag(uint8 button_bit)
+{
+  bitSet(Button.touch_mask, button_bit);
+}
+#endif // ESP32
 void ButtonInit(void)
 {
   Button.present = 0;
@@ -131,11 +144,32 @@ void ButtonHandler(void)
       }
     }
     else
-#endif  // ESP8266
     if (PinUsed(GPIO_KEY1, button_index)) {
       button_present = 1;
       button = (digitalRead(Pin(GPIO_KEY1, button_index)) != bitRead(Button.inverted_mask, button_index));
     }
+#else
+    if (PinUsed(GPIO_KEY1, button_index)) {
+      button_present = 1;
+      if (bitRead(Button.touch_mask, button_index)){ // Touch
+        uint32_t _value = touchRead(Pin(GPIO_KEY1, button_index));
+        button = NOT_PRESSED;
+        if (_value != 0){ // probably read-error
+          if(_value < TOUCH_PIN_THRESHOLD){
+            if(++Button.touch_hits[button_index]>TOUCH_HIT_THRESHOLD){
+              button = PRESSED;
+              AddLog_P2(LOG_LEVEL_DEBUG, PSTR("Touch value: %u hits: %u"), _value, Button.touch_hits[button_index]);
+            }
+          }
+          else Button.touch_hits[button_index] = 0;
+        }
+        else Button.touch_hits[button_index] = 0;
+      }
+      else{                                          // Normal button
+        button = (digitalRead(Pin(GPIO_KEY1, button_index)) != bitRead(Button.inverted_mask, button_index));
+      }
+    }
+#endif  // ESP8266
 #ifndef USE_ADC_VCC
     if (Button.adc == button_index) {
       button_present = 1;
@@ -147,7 +181,6 @@ void ButtonHandler(void)
       }
     }
 #endif  // USE_ADC_VCC
-
     if (button_present) {
       XdrvMailbox.index = button_index;
       XdrvMailbox.payload = button;

tasmota/support_tasmota.ino

@@ -1472,6 +1472,12 @@ void GpioInit(void)
         ButtonInvertFlag(mpin - AGPIO(GPIO_KEY1_INV_NP));  //  0 .. 3
         mpin -= (AGPIO(GPIO_KEY1_INV_NP) - AGPIO(GPIO_KEY1));
       }
+#ifdef ESP32
+      else if ((mpin >= AGPIO(GPIO_KEY1_TC)) && (mpin < (AGPIO(GPIO_KEY1_TC) + MAX_KEYS))) {
+        ButtonTouchFlag(mpin - AGPIO(GPIO_KEY1_TC));  //  0 .. 3
+        mpin -= (AGPIO(GPIO_KEY1_TC) - AGPIO(GPIO_KEY1));
+      }
+#endif //ESP32
       else if ((mpin >= AGPIO(GPIO_REL1_INV)) && (mpin < (AGPIO(GPIO_REL1_INV) + MAX_RELAYS))) {
         bitSet(rel_inverted, mpin - AGPIO(GPIO_REL1_INV));
         mpin -= (AGPIO(GPIO_REL1_INV) - AGPIO(GPIO_REL1));

tasmota/tasmota_template_ESP32.h

@@ -44,7 +44,7 @@
 
 enum UserSelectablePins {
   GPIO_NONE,                           // Not used
-  GPIO_KEY1, GPIO_KEY1_NP, GPIO_KEY1_INV, GPIO_KEY1_INV_NP,  // 4 x Button
+  GPIO_KEY1, GPIO_KEY1_NP, GPIO_KEY1_INV, GPIO_KEY1_INV_NP, GPIO_KEY1_TC, // 4 x Button + Touch
   GPIO_SWT1, GPIO_SWT1_NP,             // 8 x User connected external switches
   GPIO_REL1, GPIO_REL1_INV,            // 8 x Relays
   GPIO_LED1, GPIO_LED1_INV,            // 4 x Leds
@@ -138,7 +138,7 @@ enum ProgramSelectablePins {
 // Text in webpage Module Parameters and commands GPIOS and GPIO
 const char kSensorNames[] PROGMEM =
   D_SENSOR_NONE "|"
-  D_SENSOR_BUTTON "|" D_SENSOR_BUTTON "_n|" D_SENSOR_BUTTON "_i|" D_SENSOR_BUTTON "_in|"
+  D_SENSOR_BUTTON "|" D_SENSOR_BUTTON "_n|" D_SENSOR_BUTTON "_i|" D_SENSOR_BUTTON "_in|" D_SENSOR_BUTTON "_tc|"
   D_SENSOR_SWITCH "|" D_SENSOR_SWITCH "_n|"
   D_SENSOR_RELAY "|" D_SENSOR_RELAY "_i|"
   D_SENSOR_LED "|" D_SENSOR_LED "_i|"
@@ -230,6 +230,7 @@ const uint16_t kGpioNiceList[] PROGMEM = {
   AGPIO(GPIO_KEY1_NP) + MAX_KEYS,
   AGPIO(GPIO_KEY1_INV) + MAX_KEYS,
   AGPIO(GPIO_KEY1_INV_NP) + MAX_KEYS,
+  AGPIO(GPIO_KEY1_TC) + MAX_KEYS,
   AGPIO(GPIO_SWT1) + MAX_SWITCHES,      // User connected external switches
   AGPIO(GPIO_SWT1_NP) + MAX_SWITCHES,
   AGPIO(GPIO_REL1) + MAX_RELAYS,        // Relays
@@ -549,6 +550,7 @@ const uint16_t kGpioNiceList[] PROGMEM = {
 #define MAX_GPIO_PIN       40   // Number of supported GPIO
 #define MIN_FLASH_PINS     4    // Number of flash chip pins unusable for configuration (GPIO6, 7, 8 and 11)
 #define MAX_USER_PINS      36   // MAX_GPIO_PIN - MIN_FLASH_PINS
+// #define MAX_TOUCH_PINS     10   // Number of supported TOUCH PINS
 #define WEMOS_MODULE       0    // Wemos module
 
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