already 4 units in Raspberry with PiFace in use

already 4 units in Raspberry with PiFace in use

SainSmart 2 channels relay module board 5V For Arduino PIC AVR MCU DSP Relay Module (electronics)
Buy at Amazon.com

Customer Review

and all relays function properly.

Turn my irrigation and garden lighting now already
properly for months.

For this price you can not manufacture such boards but ???

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