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42 lines
1.3 KiB
C++

/*
LED PWM
Uses 2 pots to control the duty cycle of a Pulse Width Modulation
<---- pot 0 ----> <---- pot 0 ---->
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| | |
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<-- pot 1 --> <--- ...
*/
#define LED (13)
#define POT_1 (0)
#define POT_2 (1)
int delay_on;
int delay_off;
void setup() {
// initialize the digital pin as an output.
// Pin 13 has an LED connected on the nano board:
pinMode(LED, OUTPUT);
}
void loop() {
// We read the value of the pots at the beginning of the loop
// and store them as integer variables (declared at the top)
//delay_on = analogRead(POT_1);
//delay_off = analogRead(POT_2);
//
// But in meergranen PCB 1.0, the pots are wired the wrong way
// So we need to adjust that :)
delay_on = 1023 - analogRead(POT_1);
delay_off = 1023 - analogRead(POT_2);
// Parameters for the PWM
digitalWrite(LED, HIGH); // turn the LED on
delay(delay_on); // wait for delay_on ms
digitalWrite(LED, LOW); // turn the LED off
delay(delay_off); // wait for delay_off ms
}