ULUG Hackaton

July 25, 2014

A few weeks ago my local LUG(which I've been a member of since the start) organized a so called "mini hackaton". We try to do this every three months or so, they're very popular. There's something special with getting together with other nerds and working on projects, be it software or hardware, for a day and chat.

I worked on this: Timerbox a small board with a relay, two buttons, a rotary encoder and an LCD that I've designed. The ┬ÁCU is an Attiny 4313. I managed to get the LCD working quite well with a library written by user alan2k on AVRfreaks.net. This library is based on the library by Peter Fleury modified by Martin Thomas and Andreas Heinzen. It removes most of the "unnecessary" functions like scrolling but adds a very crucial setting for my PCB; disabling/enabling the RW-line. My PCB has the RW-line tied to be write-only, since I very rarely will care if the display says it's done or not, I'll handle it with delays instead.

I did however miss some things on the board, as you always do with 0.1-versions. As you can see the relay is "on stilts", that's because I forgot to change pad size when I did the footprint. I also tied the relays coil pin to +5V instead of +12V for some reason, I don't know what I was thinking there. But it's just version 0.1, 0.2 will be a lot better :)

A programming adapter for AVRs

I've just placed an order at [SeeedStudio][sed] for some PCBs that I've designed in [KiCAD][kic].It's a very simple circuit consisting of...… Continue reading

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