SensorDigitalInput review (#412)

Author: user2684

README.md

@@ -583,6 +583,14 @@ Each sensor class may expose additional methods.
 	void computeACNoise();
 ~~~
 
+* SensorDigitalInput
+~~~c
+	// Invert the value to report. E.g. report 1 if value is LOW, report 0 if HIGH (default: false) 
+	void setInvertValueToReport(bool value);
+	// Set optional internal pull up/down
+	void setInitialValue(int value);
+~~~	
+
 * SensorDigitalOutput / SensorRelay / SensorLatchingRelay1Pin / SensorLatchingRelay2Pins
 ~~~c
     // [104] when legacy mode is enabled expect a REQ message to trigger, otherwise the default SET (default: false)

sensors/SensorDigitalInput.h

@@ -23,23 +23,40 @@
 SensorDigitalInput: read the digital input of the configured pin
 */
 class SensorDigitalInput: public Sensor {
+protected:
+	bool _invert_value_to_report = false;
+	int _initial_value = -1;
 public:
 	SensorDigitalInput(int8_t pin, uint8_t child_id = 255): Sensor(pin) {
 		_name = "DIGITAL_I";
 		children.allocateBlocks(1);
 		new Child(this,INT,nodeManager.getAvailableChildId(child_id),S_CUSTOM,V_CUSTOM,_name);
 	};
+	
+	// Invert the value to report. E.g. report 1 if value is LOW, report 0 if HIGH (default: false) 
+	void setInvertValueToReport(bool value) {
+		_invert_value_to_report = value;
+	};
+	
+	// Set optional internal pull up/down
+	void setInitialValue(int value) {
+		_initial_value = value;
+	};
 
 	// define what to do during setup
 	void onSetup() {
 		// set the pin for input
 		pinMode(_pin, INPUT);
+		// set internal pull up/down
+		if (_initial_value > -1) digitalWrite(_pin,_initial_value);
 	};
 
 	// define what to do during loop
 	void onLoop(Child* child) {
 		// read the value
 		int value = digitalRead(_pin);
+		// invert the value if needed
+		if (_invert_value_to_report) value = !value;
 		// store the value
 		child->setValue(value);
 	};