Reply to "How do you wire a Geeetech 6-Channel Relay Switch?"

stan2004OGR Forum Member

Professor Chaos posted:
Are you successfully switching the relays on and off? You should be able to tell by listening for the click.
Your 5V DC power supply should be connected to VCC and GND. These boards are active-low, meaning you activate the relays by switching GND from your DC supply to inputs 1-6.

Consolidated Leo posted:
Here is a wiki page that gives some basic information on the relay module. Active low is correct. The 5 volt power is also correct. NO is normally open, NC is normally closed, and COM is the common to both. When the relay is activated, COM connects to NO; when not actived, COM connects to NC. Activate the relay by connecting the input pin to GROUND.

How did you guys conclude these are "active low"? As I read the wiki page, it suggests the inputs are active-high.

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