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This is a light controlled relay, you can set the relay on/off when the luminance is higher/lower th..
A Relay is a digital switch to control much higher voltages and currents than your normal Arduino bo..
A Relay Module 10A 8 Channel is a digital switch to control much higher voltages and currents than y..
The Relay Large Current Module 30A is the most common used module in actually application such as ho..