Create FunctionalButtonDrivingExternalVariables.ino

examples/FunctionalButton/FunctionalButtonDrivingExternalVariables.ino

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+/**
+ * FunctionalButtonDrivingExternalVariables.ino- Example for the OneButtonLibrary library.
+ * This is a sample sketch to show how to use OneClick library functionally on ESP32,ESP8266... 
+ * It is a modification of the example FunctionalButton.ino which allow the following: 
+ *     a - Passing external variable pointer to be incremented or decremented
+ *     b - incrementing or decrementing (bool)
+ *     c - increment mode: 0 = floored and pointer values are capped between the 0 and max_increment, or 1 = pointers values are capped between 0 and 255
+ *     d - max_increment
+ * Of course, the class can be modified to accept int rather than uint8_t as pointer value and max increment
+ *
+ * The example consider 4 buttons to scroll left to right in different menu and up and down to increase/decrease a duty cycle later use for a PWM fan
+ * The pwm fan can be increase gradualy or faster by long press, similarly to a digital watch
+ * Proposed by Sylvain Boyer, sylvanoMTL, Oct. 2024
+ * Tested on a ESP32-devKitC
+ */
+#include <Arduino.h>
+#include <OneButton.h>
+
+
+extern uint8_t main_menu = 0;
+extern uint8_t dutycycle = 20;   //default duty cycle set to 20 on boot
+
+class Button{
+private:
+  OneButton button;
+  uint8_t* value_ptr;   // Pointer to global value (main_menu or dutycycle)
+  bool increment;       //0 = decrement, 1 = increment
+  bool increment_mode;  //0 = floored, 1 = circular
+  uint8_t max_increment;
+public:
+  explicit Button(uint8_t pin, uint8_t* value, bool increment, bool increment_mode,uint8_t max_increment):button(pin), value_ptr(value) {
+    button.attachClick([](void *scope) { ((Button *) scope)->Clicked(); }, this);
+    button.attachDoubleClick([](void *scope) { ((Button *) scope)->DoubleClicked();}, this);
+    button.attachLongPressStart([](void *scope) { ((Button *) scope)->LongPressed();}, this);
+    button.setPressMs(2000);
+    button.attachDuringLongPress([](void *scope) { ((Button *) scope)->DuringLongPress();}, this);
+    this->increment = increment;
+    this->increment_mode = increment_mode;
+    this->max_increment = max_increment;
+  }
+  void Clicked(){
+    IncrementOnClick();
+    Serial.print("The modified value is: "); Serial.println(*value_ptr);
+  }
+
+  void IncrementOnClick(){
+    if (increment == 0){
+      if (!((increment_mode==0) && (*value_ptr)==0)){(*value_ptr)--;}  // Decrement global main_menu
+      else { Serial.println("I am doing nothing");}// do nothing
+    }
+    else if (increment == 1){
+      if (!((increment_mode==0) && (*value_ptr)==max_increment)){ (*value_ptr)++;  } // Increment global main_menu        
+      else{Serial.println("I am doing nothing");}// do nothing
+    }
+  }
+
+  void DoubleClicked(){
+    Serial.println("DoubleClick");
+  }
+  void LongPressed(){
+    Serial.println("LongPress and the value is");
+    Serial.println(*value_ptr);
+  }
+
+  void DuringLongPress(){
+    if(Button::button.getPressedMs()<10000){
+      IncrementOnClick();
+      delay(1000);
+    }
+    else if(Button::button.getPressedMs()>=10000){
+      IncrementOnClick();
+      delay(100);
+    }
+    Serial.println(*value_ptr);
+  }
+
+  void handle(){
+    Button::button.tick();
+  }
+};
+
+
+Button scrollUpButton(0,&dutycycle,true,false,100); //Up
+Button scrollDownButton(15,&dutycycle,false,false,100); //Down
+Button scrollLeftButton(2,&main_menu,false,false,5); //Left
+Button scrollRightButton(16,&main_menu,true,false,5); //Right
+
+void setup() {
+  Serial.begin(115200);
+}
+
+void loop() {
+  scrollUpButton.handle();
+  scrollDownButton.handle();
+  scrollLeftButton.handle();
+  scrollRightButton.handle();
+}