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1

Hello

I am new in that area.
I have 3pi and want to read port ADC2 (reflactance sensor 2 only PC2), and to show result on display.
But there is result “0”.

When I change to read ADC7 (pot 10K), everything work. Display show from to 1023.

Can you help me?

  1. Is it correct "analog_read(2); " is ADC2
  2. Is it correct source code for power on the IR ( PORTC |= 1 << 5;)

That is my source code.

#include <pololu/orangutan.h>
int main()
{
set_analog_mode(MODE_10_BIT); // 10-bit analog-to-digital conversions
clear();
// set the port to output PC5
DDRC |= 1 << 5;
// high to power on IR on 3pi PC5
PORTC |= 1 << 5;

int sum = 0;
int samples = 0;
int avg = 0;

analog_read(2); // start initial conversion for ADC2

while(1)
{
delay_ms(10);
clear();

print_long(avg);
if (!analog_is_converting()) // if conversion is done…
{
sum += analog_conversion_result(); // get result
start_analog_conversion(2); // start next conversion
if (++samples == 20) // if 20 samples have been taken…
{
avg = sum / 20; // compute 20-sample average of ADC result
samples = 0;
sum = 0;
}
}

}

}

Thanks

2

Hello,

Please use the “Code” button when posting code so that it is not hard to read.

The 3pi does not use analog sensors, so that is the main source of your problem. Please start with the included 3pi example programs, then try modifying them to do what you want.

-Paul