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Regarding ADC input source on STM32F3Discovery board

Question asked by Kye-Hyun Park on Nov 21, 2017
Latest reply on Nov 23, 2017 by AvaTar

Dear All,

 

I'd like to test an ADC conversion using ADC example from STM32F3Discovery's peripheral examples.

I connected ADC1 channel(PC1) and GND to external power supply directly. and It was measured a normal voltage between PC1 and GND using FLUKE Multimeter 8846A.

But, as attached the ADC value on Terminal I/O, the results are very unstable. Is that due to the bad connection for ADC input source? or I cannot catch the problem exactly. Could you please help the issue?

 

1. supplying 0V to ADC1 channel(PC1)

 

2. supplying 1.0V to ADC1 channel(PC1)

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