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46 lines
995 B
C++
46 lines
995 B
C++
/*
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*
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* Simple (PWM) Oscillator Explained
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*
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Instead of using the Tone() function, you can create a square wave oscillator by
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turning the digital pin 11 (speakerpin) on (HIGH) and off (LOW) very fast:
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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
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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 );
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delayMicroseconds( analogRead(A2) ); // wait
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digitalWrite( SPEAKER_PIN, HIGH );
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delayMicroseconds( analogRead(A2) ); // wait
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//note: delayMircoseconds wont pause your whole code like normal delay() would do
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//so, the code inside the while loop is executed simultaniously with the code in the
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//main loop. See usage in simple-poly-osc.ino
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}
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