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This relay module can switch high voltage / high current with a 3V logic signal from a microcontroller. There's an optocoupler on the PCB to isolate and protect your circuit from noise. Works well with 3.3V devices like a Raspberry Pi and esp8266. Rated Relay voltage / current: 240VAC / 10ALogic signal voltage: 3V
This is a breakout board for the fully integrated Hall Effect based linear ACS712 current sensor.The ACS712 gives precise current measurement for both AC and DC signals. It outputs an analog voltage output signal that varies linearly with sensed current.