Folding well and without additional components on Raspberry Pi

Folding well and without additional components on Raspberry Pi

SainSmart 2 channels relay module board 5V For Arduino PIC AVR MCU DSP Relay Module (electronics)
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Customer Review

The board works very well. After I have read in many places that one should not connect directly to the Raspberry Pi the board, I have even measured it and looked at the manufacturer.

If you take 5V from Raspberry GPIO (which then come directly from the USB power supply, so insensitive) and it lays on the VCC relay board, coming barely 3.3 V at 1 and IN 2 out and if you put this to GND, the current is small enough for the Pi. (jumper JD-VCC to VCC remains plugged)

I also found on the manufacturer's side, an image where the manufacturer has the relay board connected directly to the Pi. So the board is also well provided for.

IN1 and IN2 have to pull to GND to turn on the relay. So GPIO output must be "0", so that relay is energized.

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