Library for dimmer application with SAMD21G18A (e.g. Arduino Zero/M0).
Supported pwm pins (only one pin on the same channel is supported, e.g. 6 or 11):
| timer | channel | recommended pin | alternative pins |
|---|---|---|---|
| Timer0 | 0 | 2 (PA14) | A3 (PA04) |
| Timer0 | 1 | 5 (PA15) | A4 (PA05) |
| Timer0 | 2 | 6 (PA20) | 10 (PA18) |
| Timer0 | 3 | 7 (PA21) | 12 (PA19) |
| Timer1 | 0 | 4 (PA08) | 1 (PA11), 8 (PA06) |
| Timer1 | 1 | 3 (PA09) | 0 (PA10), 9 (PA07) |
| Timer2 | 0 | 11 (PA16) | 6 (PA20) |
| Timer2 | 1 | 13 (PA17) | 7 (PA21) |
Listed pins are for Arduino Zero. On Arduino M0 (Pro) pins 2 and 4 are reversed!
How to use
Create an instance: normal mode (0 to max)
DimmerZero channel1(pinnumber);
or inverted mode (max to 0)
DimmerZero channel2(pinnumber, true);
Initialization instances: channel1.init(); channel2.init();
Functions
getMaxValue(): returns max possible value.
setValue(int value), where value=0..maxValue sets timer to "value" duty-cycle
setFrequency(int value), sets PWM frequency. 250, 500 and 1000 Hz are supported. Default: 1000 Hz. Call this function before init-function.
ATTENTION:
if you change frequency or invert output, you should do it for all pins on same timer. E.g. if 11 is inverted, 13 must be inverted too!