Posts 6 comments on tl;dr complete version 1 build summary

tl;dr complete version 1 build summary

There are a lot of posts to trawl through in this blog if you’ve not followed it from the beginning. Hopefully this summary makes everything a bit clearer…

The first thing I did was to have a look at other cat tracking products on the market.  I found that they all have a big flaw… battery life.  I wanted GPS level accuracy and a battery life measured in months.  Nothing on the market offered that, so it was down to me to design it!

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PCBs, Posts 0 comments on Base station PCBs have arrived – time to solder!

Base station PCBs have arrived – time to solder!

Well, the boards actually arrived several weeks ago, but I’ve only just got round to doing the soldering.  As ever, I’ve ordered all my components from Farnell in the UK.

All of the passive components I’ve used are 0402 sized (0.5mm by 1.0mm).  The advantage of components this small is that you can squeeze a lot into the RF sections of the board, most notably at the output of the CC1125.  This decreases board size and improves the RF performance.  You can go much smaller than 0402 – 0201 is the next size down, followed by 01005 – only 0.2mm by 0.4mm!  Getting decent performance out of an inductor or capacitor that small will be difficult, so it’s a tradeoff between size and performance.

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Posts 3 comments on PCBs have arrived! Soldering and matching the antenna…

PCBs have arrived! Soldering and matching the antenna…

The PCBs have arrived from OSH Park!  As expected, they look good and the quality is excellent.  As an added bonus, they even fit in the case I designed them for.  Result!

Over the last couple of weeks I have also been ordering all the components from a combination of Farnell and tme.  Everything’s arrived and it’s all ready to solder into place.  I’ve also got the firmware into a state such that something should work too.

Now it’s time to get soldering!

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