Automatic Dawn to Dusk Sensor Board with Relay and LDR for Solar Based Street Light

The automatic dawn to dusk sensor board detects ambient light using an LDR (light dependent resistor) and switches a relay (an electrically controlled switch) automatically. It runs on a 12V DC supply and can control loads up to 240Vac, so it directly switches mains-powered street lights or garden lamps without any extra circuit. The automatic dawn to dusk sensor turns the relay on at dark and off at dawn with no manual input needed.

One non-obvious detail is that standby current stays below 1.5mA in light-activated mode, which matters for battery-backed or solar installations where every milliamp counts. The honest limitation is that sensitivity depends on LDR placement and surrounding reflections, so mount it away from direct artificial light. Electricians, facility managers for garden, street, and security lighting automation. Connect 12V supply and load to screw terminals and it works from first power-on. StemVolt provides sensor with trusted quality, ensuring reliable performance and easy usability.

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Features:

• Supply voltage of 12V DC powers the board from standard SMPS or battery sources
• Relay active current under 46mA drives the onboard relay without any external transistor
• Maximum output load up to 240Vac allows direct switching of mains-connected light fittings
• Screw terminal block connections accept wires without soldering for quick installation

Technical Specifications:

Applications:

• A colony street light project uses this to switch the fitting with no timer needed
• An automatic dawn to dusk sensor board controls a security floodlight at a gate entry
• A solar-powered pathway light uses the low standby current mode to extend battery life

Package Includes:

• 1 x Automatic Dawn to Dusk Sensor Board