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Topic: power isue with I2C (Read 75 times) previous topic - next topic

javiercasalins

Hello everybody

The situation is the following:

I have and Arduino Mega (Master) connected via I2C to a Arduino Uno (Slave). If the Arduino Mega is powered via USB, the slave works perfect. However if a power the Mega through the Jack (12 Volts) the slave donĀ“t do nothing.

Can somebody give me a hint about this.

Thank you very much

Wawa

Did you also join master/slave grounds?

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