Weather station

Electronics Club

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I’ve been running an electronics club as an extra mural activity for students at my2013-11-14 09.10.38 school for several years now. We started off building simple kits such as Velleman, Kemo and RSE who are based in JHB ( but we have now started to branch out and build our own circuits. Students have built LED signs, radios and recently started to use Arduinos ( to build more complex projects such as a tweeting weather station ( One circuit I really want to get the new students to build is the joule thief. I’d never heard of it before I came across it on The joule thief works in a very simple way. Basically take a used battery and the joule thief will build up a store of electrical energy in its toroid and release it as a pulse at a much higher voltage than the dead battery could – perfect for lighting up LEDs. At 40,000 times a second your eye can’t see the pulses, you simply see a working LED. I built a messy working version to test it out and have ordered all the parts of ebay. Let’s see if the students can build it – watch this space…