Hi!,
I am learning ADC with a butterfly trying to get a 10 bit value, but the max i can get is a reading of 187.
I have 3 volts supplied from one of the output pins wired to a 10k pot. With no load with a 10 bit value shouldn't my readings be close to 1024?
My max values of 180-190 are always stored in ADCL. I can't figure out how to read ADCH, i'm ashamed to admit that i've been trying all day. Someone?
:?
here is my modified stolen code:
void ADC_init(char input)
{
ADMUX = input; // external AREF and ADCx
ADCSRA = (1<<ADEN) | (1<<ADPS1) | (1<<ADPS0);
// Take a dummy reading , which basically allows the ADC
// to hack up any hairballs before we take any real readings
input = ADC_read();
}
int ADC_read(void)
{
char i;
int ADC_temp;
int ADCr = 0;
sbi(PORTF, PF3); // mt sbi(PORTF, PORTF3); // Enable the VCP (VC-peripheral)
sbi(DDRF, DDF3); // sbi(DDRF, PORTF3);
sbi(ADCSRA, ADEN); // Enable the ADC
//do a dummy readout first
ADCSRA |= (1<<ADSC); // do single conversion
while(!(ADCSRA & 0x10)); // wait for conversion done, ADIF flag active
for(i=0;i<40;i++) // do the ADC conversion 8 times for better accuracy
{
ADCSRA |= (1<<ADSC); // do single conversion
while(!(ADCSRA & 0x10)); // wait for conversion done, ADIF flag active
ADC_temp = ADCL; // read out ADCL register
}
cbi(PORTF,PF3); // mt cbi(PORTF, PORTF3); // disable the VCP
cbi(DDRF,DDF3); // mt cbi(DDRF, PORTF3);
cbi(ADCSRA, ADEN); // disable the ADC
return ADC_temp;
}
void getVolt1()
{
char voltintpart[]= {'0','0','0','\0'};
char voltfractpart[]= {'0','0','0','\0'};
int intpart = 0;
int fractpart = 0;
int ADCresult = 0;
// int test = 65555;
ADCresult = ADC_read();
itoa(ADCresult, voltintpart, 10);
sendString("The reading is ");
sendString(voltintpart);
ADCresult=ADCH;
itoa(ADCresult, voltintpart, 10);
sendString("The reading is ");
sendString(voltintpart);
}
