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Topic: LCD works only when powering from arduino (Read 132 times) previous topic - next topic

astetyne

Hello,

I connected my new LCD (using I2C) to my project and it was working fine. Problem started when I tried to power LCD from separate power supply. Arduino wasnt able to send any data with I2C to LCD.

I am quite suprised because I thought sending data is independent on power supply. Am I wrong? Where can be issue?

Thanks in advance.

TheMemberFormerlyKnownAsAWOL

Did you remember to connect the grounds?
Please don't PM technical questions - post them on the forum, then everyone benefits/suffers equally

astetyne

Did you remember to connect the grounds?
Thanks! That was the problem. I didnt know about this. This was my first project on separate power supply.

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