ADC_read()

[GUEST]

I have use this function to read the voltage value from channel 0. I don't know that if I use
float value;
value = adc_read();

printf("%f", value);

after this executed it will return 2.5 or something else if my apply 2.5 V to channel 0. Can anyone help?

[rberek]

adc_read does not return a float value, it returns a hex value. If you have selected an 8-bit ADC, then it will return 0xFF if the pin is 5V and 0x00 if there is 0V on the pin, etc.. You have to perform the math on the hex value to turn it back into a voltage.
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