Power from 9V battery not working?

Other Hardware General Electronics
1

Hi guys how are you? Trying to understand what is wrong here if you can help I appreciate. So this is a ES8266 in a breadboard with external power supply. I am trying to power all this from 9V battery. The LCD turns on however seems the arduino is not working properly.

When I connect the arduino to my PC USB everything else works well, however if I disconnect and connect into the USB port that is powered by the battery, the arduino does not work. (LCD still turns on but no data come through).

WhatsApp Image 2022-05-19 at 2.36.47 PM
WhatsApp Image 2022-05-19 at 2.36.47 PM2048×1152 373 KB

Does that mean 9V battery cannot supply enough power to my project? Thanks.

2

Have you tried connecting it with any adapter connected to external power supply. If it works then probably you'll be needing a battery with more power supply.

4

Oh nice catch ! I just tried with it connected to the power supply on my wall and still DIDN'T work !! That is so confusing ! When I connect the USB to computer it works immediately!

5

TBH I am a newbie to this. The above part just popped into my mind so I suggested it. Are the power connections done properly? Check in the code the pins that you mentioned are correct or not.

1 Like
6

Hello rafrox
Take a DMM and trace the power supply on the PCB of the Arduino.
Have a nice day and enjoy coding in C++.
Дайте миру шанс!

7

I made it work. The thing is I had to connect an extra cable from 3V pin in the arduino to the breadboard "+" signal, so now all working thanks guys !

8

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