SlowPWM v1.0 - added optional 10/12bits analog resolution

Author: wkoch

README.md

@@ -10,13 +10,24 @@ Include the library in your sketch:
 
     #include <SlowPWM.h>
 
-### Constructor
+### Constructors
 
-This will create a SlowPWM object with a custom duty-cycle:
+There are 2 constructors which differ by analog resolution.
+
+#### Default
+
+This will create a SlowPWM object with a custom duty-cycle and 10bit analog resolution:
 
     SlowPWM myPWM(1000, A1, 10);
     // 1000ms duty-cycle, input pin: A1, output pin: 10
 
+#### 12bits Analog Resolution
+
+The same as above, but with 12 bits analog resolution:
+
+    SlowPWM myPWM(1000, A1, 10, 12);
+    // 1000ms duty-cycle, input pin: A1, output pin: 10, 12bits.
+
 ### Functions
 
 SlowPWM has 3 functions.

SlowPWM.cpp

@@ -18,6 +18,18 @@ SlowPWM::SlowPWM(unsigned long duty_cycle, byte input, byte output) {
   _output = output;
   _start = 0;
   _status = _active = false;
+  _res = 1023;
+}
+
+SlowPWM::SlowPWM(unsigned long duty_cycle, byte input, byte output, byte bits) {
+  pinMode(input, INPUT);
+  pinMode(output, OUTPUT);
+  _duty_cycle = duty_cycle;
+  _input = input;
+  _output = output;
+  _start = 0;
+  _status = _active = false;
+  bits == 12 ? _res = 4095 : _res = 1023;
 }
 
 void SlowPWM::on() {
@@ -31,7 +43,7 @@ void SlowPWM::update() {
   _now = millis();
   if (_status) {
     if (_start >= _end || _start == 0) {
-      _high = _start + map(analogRead(_input), 0, 1023, 0, _duty_cycle);
+      _high = _start + map(analogRead(_input), 0, _res, 0, _duty_cycle);
       _end  = _start + _duty_cycle;
       if (_start == 0) {_start = _now;}
     }

SlowPWM.h

@@ -13,11 +13,14 @@
 class SlowPWM {
   public:
     SlowPWM(unsigned long duty_cycle, byte input, byte output);
+    SlowPWM(unsigned long duty_cycle, byte input, byte output, byte bits);
+
     void on();
     void off();
     void update();
   private:
     unsigned long _duty_cycle, _start, _high, _end, _now;
+    int _res;
     byte _input, _output;
     boolean _status, _active;
 };