23 May '15, 2am

Making Servos Spin Right Round Without Stopping - #arduino

Thanks! I already have ADNS-9800 and I tried the ins and outs of it but I’ve found out that although its local resolution is indeed very high (up to 8000 counts per inch), it always slips very quickly and pretty severely. I even tried achieving perfect focus and providing it with a good surface, implemented a realtime camera view for that. But it slips regardless. An interesting alternative would be to use its camera to read some kind of code for an absolute encoder, it has a theoretical maximum of about 60fps in such mode — although thanks to retarded SPI implementation in the sensor you can’t use DMA to transfer the frames, at least not on a simple micro like stm32f103. Anyway, the real problem is that with the supplied lens the focused surface area is only a tiny bit larger than 1 square millimeter and printing such a tiny code and then aligning it perfectly is just too...

Full article: http://hackaday.com/2015/05/04/making-servos-spin-right-r...

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