8 years, 1 month ago.

I have trouble with the analog input

I have trouble to read the adc...

I have a pot between GND and Vout on a LPC1768 board. The middle pin of the pot is to p17 on LPC1768.

I have tried to use:

AnalogIn pot(p17);

printf("%d", pot.read_u16() >> 4); printf("%f", (float)pot);

its work fine, but the voltage must be over 60-70mV before the LPC1768 is respond with a value over 0.

Like there is a offset.... before the ADC is start.

Can somebody tell me, what i do wrong?

I measure the voltage from the pot with at multimeter.

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