Posts 2 comments on Choosing a Power Source

Choosing a Power Source

The last thing I need to work out before getting on with the schematic is which battery chemistry I’m going to use.  The most important thing at this point isn’t necessarily identifying the exact battery I want to use, I need to just know the voltage, such that I can design the circuit to suit.

In order to work out the ideal battery chemistry, I need to work out how much each component draws, both in sleep mode and at its peak.

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Posts 1 comment on Choosing a Microcontroller

Choosing a Microcontroller

We’re having a bit of a heat-wave at the minute in the UK!  It has been over 30°C (86°F) for 2 days in a row.  We can’t cope.  It’s too hot.  Buttons particularly is not impressed.  The coolest place he’s found is on top of the water butt – as you can see in the picture.

Anyway, as everyone knows, the best thing to do when it’s nice and sunny outside is sit inside on a computer and look at Microcontrollers.

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Posts 0 comments on Why not just buy a GPS cat tracker?

Why not just buy a GPS cat tracker?

The simple answer is battery life.

My requirements for a cat tracker are:

  1. Very long battery life (around 3 months).  I don’t want to be changing batteries all the time.  The one day I forget to change the battery will be the day when Buttons decides to go an investigate next door’s shed, I know it.
  2. GPS-level accuracy.
  3. The ability to remotely find out where your cat currently is, allowing you to find him if he’s lost.
  4. Small enough and light enough for a cat to carry around (obviously!).

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