add sensors classes: push button, potentiometer, pressure sensor

twinmax/sensors.cpp

@@ -0,0 +1,58 @@
+#include <Arduino.h>
+#include <string.h>
+#include "sensors.h"
+
+void PushButton::setup(const int pin){
+	pinMode(pin, INPUT);
+	_pin = pin;
+}
+
+bool PushButton::tick(){
+	const bool pushed = (digitalRead(_pin) == 0);
+	const bool toggle = (pushed != _pushed);
+	_pushed = pushed;
+
+	if( toggle && pushed ){ // button has been pressed
+		_pushStart = millis();
+	}
+
+	return toggle;
+}
+
+bool PushButton::tap(){
+	const bool toggle = tick();
+
+	// released and last less than hold threshold
+	return toggle && !_pushed && (millis()-_pushStart) < HOLD_MS_THRESHOLD;
+}
+
+bool PushButton::hold(){
+	const bool toggle = tick();
+
+	// released and last at ;east hold threshold
+	return toggle && !_pushed && (millis()-_pushStart) >= HOLD_MS_THRESHOLD;
+}
+
+
+
+
+void Potentiometer::setup(const int pin){
+	pinMode(pin, INPUT);
+	_pin = pin;
+}
+
+short Potentiometer::range(){
+	return 1023 - analogRead(_pin);
+}
+
+
+
+// pressure sensors
+void Pressure::setup(const int pin){
+	pinMode(pin, INPUT);
+	_pin = pin;
+}
+
+short Pressure::value(){
+	return analogRead(_pin);
+}

twinmax/sensors.h

@@ -0,0 +1,44 @@
+#ifndef _SENSORS_H_DEF_
+#define _SENSORS_H_DEF_
+
+	#define HOLD_MS_THRESHOLD	2000
+
+	// push button non-blocking state
+	class PushButton {
+		public:
+			void setup(const int pin);
+			bool tap(); // button has been pushed for a short amount of time
+			bool hold(); // button has been pushed for at least HOLD_MS_THRESHOLD milliseconds
+
+		private:
+			// returns whether the button state changed
+			bool tick();
+
+
+			// value of millis() when the button is down
+			unsigned long _pushStart { 0 };
+			bool _pushed { false };
+			int _pin { 0 };
+	};
+
+	// potentiometer value
+	class Potentiometer {
+		public:
+			void setup(const int pin);
+			short range();
+
+		private:
+			int _pin { 0 };
+	};
+
+	// pressure sensors
+	class Pressure {
+		public:
+			void setup(const int pin);
+			short value();
+
+		private:
+			int _pin { 0 };
+	};
+
+#endif