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…

Funky v3 and YAPM project files now on github

I have published the Eagle design files for the Funky v3 and YAPM projects here and here respectively for anyone interested to try them out. A quick re-cap – Funky v3 is a miniature low power battery operated Arduino Leonardo with radio module, and the YAPM is a cheap power monitor project. The Funky v3…

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…

Keypad as USB keyboard

I fiddled with a new keypad today, this is not the first time I have a keypad project, but this time I want it to act as a USB keyboard instead. This is a convenient way to enter numeric data and I have some project ideas in the pipeline that will need a keypad. The…

I am a @quantifiedself

I accidentally landed on a site called ‘quantified self’ last month and immediately realized I am doing lots of lifelogging myself. I track my commutes, log my weight, my body temperature when sick, my hot water usage habits, visitors to my home, coffee drinking. Power usage tracking  and habitat monitoring provide useful insights on my…