Detecting AC

I sometimes have home automation projects that require detecting AC voltage (on/off only), previously have experimented with non-contact AC detection. Here is another approach that may be more suitable for low-power AC detection node: using a NE2 neon lamp and an LDR     The bulb will reduce LDR’s resistance and the circuit will read…

My dog as smart wireless DVR sensor

I live in a small village ~25km from Sofia, Bulgaria and commute daily to the city. My house’s alarm system would occasionally ring me and I would rush back home to see if all is fine, that can be pretty inconvenient. For that reason, I installed a basic home security CCTV surveillance DVR system, so…

Clapping to control RF power sockets

I did a fun experiment this evening, clap controlling RF power sockets using Funky v2‘s radio module and a sound sensor breakout module. The latter is pretty cheap one, respectively low quality and performance:   It has couple outputs: analog and digital one. The digital output goes HIGH upon audio signal from the microphone reaching…