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//https://edisonsciencecorner.blogspot.com/2020/06/blog-post_18.html
//https://edisonsciencecorner.blogspot.com/2020/06/blog-post_18.html
//https://edisonsciencecorner.blogspot.com/2020/06/blog-post_18.html
//code credits makezine.com
byte TP = 0b10101010; // Every other port receives the inverted signal
void setup() {
DDRC = 0b11111111; // Set all analog ports to be outputs
// Initialize Timer1
noInterrupts(); // Disable interrupts
TCCR1A = 0;
TCCR1B = 0;
TCNT1 = 0;
OCR1A = 200; // Set compare register (16MHz / 200 = 80kHz square wave -> 40kHz full wave)
TCCR1B |= (1 << WGM12); // CTC mode
TCCR1B |= (1 << CS10); // Set prescaler to 1 ==> no prescaling
TIMSK1 |= (1 << OCIE1A); // Enable compare timer interrupt
interrupts(); // Enable interrupts
}
ISR(TIMER1_COMPA_vect) {
PORTC = TP; // Send the value of TP to the outputs
TP = ~TP; // Invert TP for the next run
}
void loop() {
// Nothing left to do here :)
}
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