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relay module interfacing with arduino code and circuit diagam
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![SOLVED] 5v 8 channel relay board - external power source problem. - General Electronics - Arduino Forum](https://europe1.discourse-cdn.com/arduino/optimized/4X/0/7/4/0745b340b2c652009cdfe4895c3608e4d8015770_2_375x500.jpeg "SOLVED] 5v 8 channel relay board - external power source problem. - General Electronics - Arduino Forum")
SOLVED] 5v 8 channel relay board - external power source problem. - General Electronics - Arduino Forum
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