ADC print value accuracy?

RE: ADC print value accuracy?

MartinBL — Sun, 12 Jun 2016 13:29:08 GMT

Normally there is no need for a pull-down resistor. That would just mess with your results. But for the record, the pull up/down resistors are between 11kOhm and 16kOhm on all GPIOs.

RE: ADC print value accuracy?

Sri_guy — Sat, 11 Jun 2016 15:34:14 GMT

Thanks,

Also do you have to use a pull down resistor connected to Analog Pin? If so, what resistance?

RE: ADC print value accuracy?

Kapil Rawat — Sat, 11 Jun 2016 07:12:22 GMT

Hi see this thread adc Also see attached file ADC_Config.pdf

I think in your config.

First thing is to use ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling for Analog pin as input. The ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling is to use the VCC supply input
Second multiply with 1.2 instant of 3.6 ( value = (value * 3.6) / 1024) because you are using 1.2 reference voltage.