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…

3D modelling of PCB designs

@Gadjet from http://www.gadjet.co.uk/ showed off some nice 3D renderings of his projects the other day in JeeLab’s forums and had me all excited about it. He used EagleUp, some nice peace of software that turns your Eagle PCB layouts into Google Sketchup models. Here’s how the latest SuperFunky looks (note the added micro USB port) Page views:…

Super ‘Funky’

Tobias’s original ‘Funky’ had voltage regulator, that I removed in my version in favor of a voltage step-up circuit. How about having both on the Funky and you will decide which one to use depending on the concrete application? Well, I managed to squeeze in a voltage regulator, while keeping the step-up circuit. Another change that I…

Interfacing ‘Funky’ to Raspberry Pi

I am finding myself using Funkys for all of my recent projects, so I am thinking of discontinuing the TinySensor. I think the better approach would be to have various ‘shields’ for the Funky rather having hardware on board that anyone will rarely use, for example the SD card option, the voltage divider or the…

Clocking ATTiny84 from RFM12B (thinking outloud)

I have been thinking on the possibilities to use external clock source for my ATTiny84 projects for some obvious reasons. Using the internal oscillator works great in most cases, but may not be so accurate in some applications (IR,RF) as it depends on the VCC and temperature. You can measure both in the code and adjust…