Ideal for use with Arduino and other microcontrollers, this relay module uses data signals to selectively switch two 5V relays, each capable of handling 10A loads. Onboard LED indicators light when a relay is switched. Screw terminals for relay outputs. 0.1" header for voltage and signal input. 50 x 39 x 18mm. 4-relay module also available, CAT# RLM-4.
Spec sheet available in PDF format.
Customer Reviews
(2 Reviews)
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Connection info... most of it 
Reviewer:
A viewer
from PELHAM, AL USA
No doc. comes with it. I got this to work as follows:
5vdc to the Vcc terminal
Gnd to the Gnd terminal (obviously)
Relay is actuated by pulling the in1 or in2 terminal low (to gnd.)
I have not determined what the jumper does, other than to operate as described above the jumper must be Vcc-Vcc.
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