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CAT # PRM-1 5 out of 5 stars(1 Review) Write a Review

$ 4.60
$4.60 each
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Product Description
Photo-resistor controlled relay module. S.P.D.T. relay switches when light is sufficiently low or high. Cadmium Sulfide (CdS) photo-resistor sensor determines when a relay switches. Sensitivity adjustment potentiometer. Screw-clamp terminals for input and output. Led indicators for power (red) and relay actuation (blue).

• XH-M131 module
• 4 x 5mm CdS photocell on 9" leads plugs into board
• SPDT relay, 10A contacts. cULus.
• Input: 12 Vdc
• Output: up to 10 Amp 28-30 Vdc / 125-250 Vac
• PC board size: 1.2" x 2.1" x 0.7" H
Spec sheet available in PDF format.
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews 5 out of 5 stars(1 Review)

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Relay board uses LM393 comparator. 5 out of 5 stars

Reviewer: from Spokane, WA

Using this relay module as a false start trigger for the race starting lights I have been building using 1 watt LED lights. The ST-1172 laser module is a perfect light source and runs on 3 1.5V batteries. The CTM-70 cardboard tubes fit the CdS cell perfectly to eliminate stray light sources. Since this relay operates on 12VDC, it allows the entire system to run on battery power so we can set up anywhere. Added a LED-1 with a 680 ohm resistor between the Vcc and the NO terminal to aid in alignment of the unit. Could have used the blue LED but it was not bright enough. The starting lights are connected across the NC terminal and COM ground, so they trip the stop light if anyone starts early and breaks the laser beam.

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