<![CDATA[EXT. I/O 2 Unit ADC Input Problem]]>Hi all,

I just got my hands on a Ext. I/O 2 Unit to read 3 potentiometers. I and using the official ADC Input example code from here (https://github.com/m5stack/M5Unit-EXTIO2/blob/main/examples/Unit_EXTIO2_M5Core/ADC_INPUT/ADC_INPUT.ino)

It reads the data, but the number went to 4095 (max value) before the potentiometer is fully turned. Actually, if I position the knob right at the middle, it show 3160 on the screen. What did I do wrong? How can I have it cover the whole rotation?

many thanks,

]]>https://community.m5stack.com/topic/6310/ext-i-o-2-unit-adc-input-problemRSS for NodeWed, 29 Apr 2026 06:20:51 GMTMon, 08 Apr 2024 02:10:22 GMT60<![CDATA[Reply to EXT. I/O 2 Unit ADC Input Problem on Mon, 08 Apr 2024 03:16:35 GMT]]>@ghettokon Sounds like you have an 'audio curve' non-linear volume control pot!
If it is a linear pot, then you either use a voltage divider or add resistors to the top pin or bottom pin as required to get centre.
If 'volume control pot' then you will have to characterize the signal in your code.

]]>https://community.m5stack.com/post/24716https://community.m5stack.com/post/24716Mon, 08 Apr 2024 03:16:35 GMT