estratos
Junior Member level 2
Hi!
I have a simple circuit formed by a microcontroller reading an analog voltage. This voltage is suffering from noise due to the microcontroller high speeds I guess. The issue is that when I touch the analog line with my screw drive (or any other metalic tool) the signal gets stabilized and the uC reads it correctly. I know that I should have added a low pass filter in order to avoid this kind of problems but I didn't . However, there is some place to add a bypass capacitor between the analog line and ground. I've tried several values for this capacitor (10nF, 100nF, 33pF) without sucess. I just guessed that my body acted as a capacitor connected to ground so I tried to reproduce this effect.
Any idea other than adding a RC filter?
Thanks,
Daniel.
I have a simple circuit formed by a microcontroller reading an analog voltage. This voltage is suffering from noise due to the microcontroller high speeds I guess. The issue is that when I touch the analog line with my screw drive (or any other metalic tool) the signal gets stabilized and the uC reads it correctly. I know that I should have added a low pass filter in order to avoid this kind of problems but I didn't . However, there is some place to add a bypass capacitor between the analog line and ground. I've tried several values for this capacitor (10nF, 100nF, 33pF) without sucess. I just guessed that my body acted as a capacitor connected to ground so I tried to reproduce this effect.
Any idea other than adding a RC filter?
Thanks,
Daniel.