2023-12-26 08:05 PM
Hi
Im using Stm32f429 disc1 board internal adc im using the signal generator and giving constant input but the waveform after plotting gives variation for each trail.
Solved! Go to Solution.
2023-12-27 07:24 AM - edited 2023-12-27 07:25 AM
The ADC will load the signal to some degree. It acts like a ~50 kOhm load. If your signal generator is in high impedance mode, this will affect the signal. Probably that is the issue.
Solutions:
2023-12-26 08:28 PM
Seems like a reasonable signal to me.
ADC values will not be exact, expect some amount of noise. See here for general tips to improve ADC accuracy:
2023-12-27 12:12 AM - edited 2023-12-27 12:46 AM
The input signal is shifting as soon as I connect to my stm32f429 board
2023-12-27 06:10 AM
Add more details here if you want a more specific response. What are the blue and red lines? What are you expecting them to look like and why? What does shifting mean? You say constant input, but your output looks like a wave? How is signal being generated?
2023-12-27 07:07 AM
1)A sine wave from the function generator when checked through oscilloscope before and after connecting to input of stm giving me little shift (before converting)
2)The red and blue line are output waveform after converting the adc sample.
3)I'm not able to find out where I'm going wrong
I want a fixed output whenever I measure
2023-12-27 07:24 AM - edited 2023-12-27 07:25 AM
The ADC will load the signal to some degree. It acts like a ~50 kOhm load. If your signal generator is in high impedance mode, this will affect the signal. Probably that is the issue.
Solutions: