Light Barrier

Solar-powered light barrier across the driveway

November 11, 2018

Light barrier using pulsed IR. The transmitter is based on NE555 timers and the receiver on a special-purpose IR receiver, an stm32 for control, and an rfm69 radio to transmit interruptions.

Driveway entrance chime powered by solar light barrier

October 6, 2018

Solar powered light barrier across a driveway to signal the entrance and departure of vehicles and pedestrians using a door chime. Communication between the light barrier and the chime is via RF links and MQTT.