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41 lines
1.2 KiB
Arduino

/*
*
* Simple (PWM) Low Frequency Oscillator (LFO)
*
Instead of using the square waves to generate oscillations in the (human) audio spectrum (20Hz-20KHz)
You can use low frequency oscillations as 'control voltage': using the PWM HIGH (+5v) and LOW (0v) to trigger other modules
and control their adjustable parameters connected to Analog pins 0,1,2 and 3
Most LFO's do reach the audible spectrum when oscillating fast enough ofcourse.
|
HIGH | ___ ___
| | | | | 50% duty cycle
LOW | ____| |____| | (50% on, 50 off) Determined by delayMicroseconds()
|
|____________________
TIME
*
*
*
*
*
*/
#define SPEAKER_PIN 11 //the output pin
void setup() {
// set pin 11 as output
pinMode(SPEAKER_PIN, OUTPUT);
}
void loop() {
digitalWrite( SPEAKER_PIN, LOW ); // 0v to pin 11
delay( analogRead(A2)*5 ); // wait*10, analogRead gives values between 0-1023, so max wait is 1sec, lets make it ~5sec by multiplying the read value * 5
digitalWrite( SPEAKER_PIN, HIGH ); // +5v to pin 11
delay( analogRead(A2)*5 ); // wait*10, analogRead gives values between 0-1023, so max wait is 1sec, lets make it ~5sec by multiplying the read value * 5
}