Analog pin can't read properly

Other Hardware General Electronics
1

I use Wemos D1 R2 mini, I use it to read data from RFID and send it to firebase rtdb, my problem is when I build the menu and I used multiple buttons (connected to A0 pin). I got a weird ADC value the value is around from 0 to 300, but when I remove the RFID reader the value got normal again. my question is, How do I get value from the analog pin properly so I can get true or false value from my push button? I hope someone can help me.

This is my pin out and multiple buttons schema
The all resistor value is 220 ohm

WhatsApp Image 2022-08-03 at 23.43.49
WhatsApp Image 2022-08-03 at 23.43.491280×945 40.7 KB

2

In the diagram you posted, the analog input appears to be "floating", which leads to random ADC values when no button is pressed.

Add a resistor to ground, as shown in this tutorial: https://www.instructables.com/How-to-Multiple-Buttons-on-1-Analog-Pin-Arduino-Tu/

3

Please do not cross post.

4

sorry, my previous post is archived by the system but when I write this post my previous post was not hidden again I'll remove my previous post.

5

Not with a Wemos, which has a 100k:220k divider permanently connected to A0.

A Wemos is a 3.3volt device, so power your divider from 3.3volt, not 5volt.
Leo..