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+--- Thread: Pulse Exact Frequencies (/thread-12.html)
Pulse Exact Frequencies - Jim Mac - 08-16-2023
I just wanted to post this in case it helps others..
Using arduino and H-bridge to flip polarities, it can be difficult to pulse DC square waves at exact controllable frequencies without complex timers, etc. And counting delay microseconds is hit or miss..
I figured out a way to use the "Tone Function" to control frequency of pulses. Just have to change the Hz value in the code and it's dead on.. I been playing with a resonance circuit and the frequency on the scope is exact.. Be aware- it will only work up to 31 Khz tho..
!!!!!!!!!!!!!!!!!!!!!!!!!! CODE !!!!!!!!!!!!!!!!!!!!!!!
int r1 = 6;
int r2 = 7;
int receiver = 8;
void setup(){
pinMode(r1, OUTPUT);
pinMode(r2, OUTPUT);
pinMode(receiver, INPUT);
tone(5, 1000);
}
void loop() {
if (receiver == HIGH)
{
digitalWrite(r1, LOW);
digitalWrite(r2, HIGH);
}
else
{
digitalWrite(r1, HIGH);
digitalWrite(r2, LOW);
}
}
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Now on the arduino, put a jumper from D5 to D8. And connect your H bridge PWM inputs to pins 6 and 7. Thats it....
To change frequency- find this code "tone(5, 1000);" and change 1000 to whatever hertz you want up to 31000 Hz.
Maybe someone will find this useful!