Hooray! My new custom circuit boards for my battery impedance tester project just arrived. Now I can start assembling a prototype and get some code going on the micro (Picaxe 20X2). I should be able to achieve 350 micro-ohm resolution, which should be good as most of the batteries I intend to test are 4000 uOhms and greater when new. This should give me a good idea of the battery health. I intend to cycle the 1 Ohm load across the battery and measure the voltage drop with the 12-bit ADC. I haven't decided if I'm going to ramp it up PWM style or just switch it on, read voltage, then back off. I will have to try both ways and see what works best.
Thanks for posting your work. It is refreshing to see there are still some red-blooded electronic enthusiast and tinkerers.
ReplyDeleteI personally like your paper and pencil schematics, reminds me of the famous Forrest Mims notebooks sold at Radio Shack.
Thanks! Glad you like the projects. I have tried using schematic drawing programs to moderate success in the past, but I feel that the quickest way to flesh out the idea in my head is just drawing it out on graph paper. Then sometimes I formalize it into a computerized schematic later on...
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