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41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
/*
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*
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* Simple (PWM) Low Frequency Oscillator (LFO)
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*
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Instead of using the square waves to generate oscillations in the (human) audio spectrum (20Hz-20KHz)
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You can use low frequency oscillations as 'control voltage': using the PWM HIGH (+5v) and LOW (0v) to trigger other modules
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and control their adjustable parameters connected to Analog pins 0,1,2 and 3
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Most LFO's do reach the audible spectrum when oscillating fast enough ofcourse.
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HIGH | ___ ___
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| | | | | 50% duty cycle
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LOW | ____| |____| | (50% on, 50 off) Determined by delayMicroseconds()
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|____________________
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TIME
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*
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*
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*
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*
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*
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*/
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#define SPEAKER_PIN 11 //the output pin
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void setup() {
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// set pin 11 as output
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pinMode(SPEAKER_PIN, OUTPUT);
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}
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void loop() {
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digitalWrite( SPEAKER_PIN, LOW ); // 0v to pin 11
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delay( analogRead(A2)*5 ); // wait*200, analogRead gives values between 0-1023, so max wait is 1sec, lets make it ~5sec by multiplying the read value * 5
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digitalWrite( SPEAKER_PIN, HIGH ); // +5v to pin 11
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delay( analogRead(A2)*5 ); // wait*200, analogRead gives values between 0-1023, so max wait is 1sec, lets make it ~5sec by multiplying the read value * 5
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}
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