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…

CR2032 battery discharge pattern

The Funky v1 + DS18B20 room temperature monitoring project that I installed in our living room on October 31st 2012 has stopped sending. This actually happened few days ago (Aug 10th 2013), but I just noticed it today while checking the graphs. That makes 9 months and 10 days of run time on 220 mAh…

3D printed Stevenson screen

@Dimitrios commented the other day on my Funky+DHT22 post that my readings seem to have a lot of 99.9% relative humidity readouts and suggested that it may be due to the black box that I enclosed the project. I do have some holes drilled, but probably not enough to get decent air circulation: I compared…

7 months of sending and still going

My Funky+DS18B20 temperature logging project is still running on that same CR2032 battery ever since my original post back in Oct 31st 2012, that makes it 7 months of run time so far. I have a live chart here: It is probably at the end of its life, but having said so, probably will kick…

Funky LED candle

There is probably a million LED candle projects already, so I had to give it a try too :). I used bare Funky PCB and an ATTiny84 – no need for anything else indeed.The Attiny is set to run on 1Mhz with BOD disabled, so it will keep going down to 1.8V. I soldered a…

USB on the Funky

I recently came across a neat little (literally) project called MicroFTX. It is incredibly small USB to serial adapter board based on FT230XQ (datasheet) from FTDI’s new X-Chip series. I thought it would be neat to throw in some native USB support on the Funky, so I did a small experiment. This is all work in progress…

Clocking the Funky sensor from RFM12B’s crystal

I have already expressed my thoughts on this, and of course could not resist materializing them. The main reason is that I would like to experiment with IR and RF stuff that requires precise timings. The internal oscillator’s frequency depends notably on temperature and voltage change and although it can be calibrated, I still prefer crystal. The…