Hi there! I've been working on this project for a little while now and can seem to get it to work... I can't determine if my problem is in my wiring or my code... I normally would give up at this point but it's a pretty important project... Anyhow, I'll add what I'm using for wiring and post my code here also, you guys can take a look and see if you can see any problems... Basically I'm trying to get a frequency just as some type of tuner would from a microphone... Whenever I try to run the code it reads in the serial monitor "0.00 hz"
Find Wiring Here: http://postimg.org/image/6990p484l/
boolean clipping = 0;
//data storage variables
byte newData = 0;
byte prevData = 0;
//freq variables
unsigned int timer = 0;//counts period of wave
unsigned int period;
int frequency;
void setup(){
Serial.begin(9600);
pinMode(13,OUTPUT);//led indicator pin
cli();//diable interrupts
//set up continuous sampling of analog pin 0
//clear ADCSRA and ADCSRB registers
ADCSRA = 0;
ADCSRB = 0;
ADMUX |= (1 << REFS0); //set reference voltage
ADMUX |= (1 << ADLAR); //left align the ADC value- so we can read highest 8 bits from ADCH register only
ADCSRA |= (1 << ADPS2) | (1 << ADPS0); //set ADC clock with 32 prescaler- 16mHz/32=500kHz
ADCSRA |= (1 << ADATE); //enabble auto trigger
ADCSRA |= (1 << ADIE); //enable interrupts when measurement complete
ADCSRA |= (1 << ADEN); //enable ADC
ADCSRA |= (1 << ADSC); //start ADC measurements
sei();//enable interrupts
}
ISR(ADC_vect) {//when new ADC value ready
prevData = newData;//store previous value
newData = ADCH;//get value from A0
if (prevData < 127 && newData >=127){//if increasing and crossing midpoint
period = timer;//get period
timer = 0;//reset timer
}
if (newData == 0 || newData == 1023){//if clipping
PORTB |= B00100000;//set pin 13 high- turn on clipping indicator led
clipping = 1;//currently clipping
}
timer++;//increment timer at rate of 38.5kHz
}
void loop(){
if (clipping){//if currently clipping
PORTB &= B11011111;//turn off clippng indicator led
clipping = 0;
}
frequency = 38462/period;//timer rate/period
//print results
Serial.print(frequency);
Serial.println(" hz");
delay(100);
}
