DC 12V Photosensitive Diode Relay Module

Where the AS-10 photoswitch is a sealed, fixed-behavior automation device, this module exposes the same underlying light-triggered relay concept as an adjustable, board-level component - a photodiode senses light intensity, and once it crosses a threshold set by an onboard potentiometer, the relay switches its connected load directly. That adjustability is the key difference: sensitivity gets tuned to the exact ambient conditions of a specific installation rather than being fixed at the factory.

Rated for 250V AC or 30V DC at up to 10A, the relay itself handles genuinely significant loads, while the low-voltage trigger side (5V, 20mA) stays compatible with simple driving circuits or even a microcontroller output if some digital logic needs to influence the trigger threshold. Four fixed mounting holes make it straightforward to secure permanently inside an enclosure rather than leaving it loose.

Common uses are DIY automatic lighting control circuits needing an adjustable (not fixed) dusk-to-dawn trigger point, light-activated automation projects switching a relay-controlled load based on ambient brightness, and general light-sensing automation where the fixed threshold of a sealed photoswitch product isn't flexible enough.