Hello, world

I use Google Analytics on this blog to track visits and have collected statistics for couple years now. I toyed with these a bit today to see where are the visitors from, just out of curiosity and for no particular other reason. I used Tableau to generate the below stats, it connects to Google Analytics directly and has…

The YAPM PCB is done

It has been a while since my last post, I have a new job and little time left for hobby stuff 🙂 Anyway, I have put together the PCB for the Yet Another Power Monitor (YAPM) project and was able to do some preliminary tests over the weekend. To re-cap: the YAPM is a low cost…

Funky v3 PCB populated

As I mentioned the other day, I have Funky v3 PCBs waiting to be populated/tested. I did finally have some time to do that, here is how they look: I plan to use this particular one to run tests, so I soldered double-row female headers on the side headers: I tested it briefly, it works…

OLED status display on the RFM2Pi board

I added a 6 pin port on the RFM2Pi board that can be used for a number of applications. The port has GND, D3, D7, D6 and VCC routed, and by no coincidence matches perfectly the pinout of the Digole 0.96″ OLED Serial display that I toyed with previously. The OLED PCB is exactly the…

Funky v3

I have made a major reshuffling of the Funky v2, added 8 more pins to the side headers while keeping the form factor. I had to go for ‘pads’ instead of through-hole to make this possible:     The newly routed pins are D9, D7, D12, D6, A3, A4, D0 and D1; The on-board LED…

Yet another power monitor

I seem to be doing power monitoring projects a lot, started with this one, then moved on to this, then this and now I am again putting up a power monitor.. This particular will be using a small transformer with two secondary windings: one will be used to power the circuitry and the other for…

Analysis of electricity usage per year

I started collecting electricity usage data in April 2012, and wanted to check how am I doing this year compared to last year. Of course, as of today, only few months overlap (May-August), but still that will give me some idea if all my energy use optimizations have effect. I started by exporting the daily kWh…

Thoughts on AVR ADC accuracy

I was thinking about the accuracy of the battery measurements the other day, are these accurate or not? I measured the battery using Fluke 27 multimeter and compared that to the readout using the internal bangap method and found a small difference. Googling on the subject revealed that the supposedly 1.1V internal bandgap reference can actually vary.…