Post by thread:[EE] Stepper motorasanencoder-andaccidentalmicroph

Here are a couple of waveforms, captured with the soundcard and Goldwave (a handy and free way to make a storage scope) http://home.clear.net.nz/pages/joecolquitt/nearly_good_1Hz.gif http://home.clear.net.nz/pages/joecolquitt/nearly_good_20Hz.gif Voltage span is approx 1V to 5V (ie clipping) Despite best efforts (IMHO), the low speed wave is still irregular, but I think I've seen a way around it There are definite boundaries crossed by legitimate pulses and logic would work here. As occassionally two negative excursions appear, the second can be filtered out (ignored) by the PIC

> :: friend wants one moving spotlight to highlight > :: a series of pieces in sequence > > Sounds an ideal wheeze for solar cell positioning I have a neighbour who's got some smallish solar cells, and we were talking about where to mount it and tracking for best collection. A couple of steppers with either sun-seeking or an azimuth calendar would do > programming satellite tracking He also asked about a fine control for his telescope. The optics are good, plus it has a camera attachment, but it's a really sh***y plastic tripod and fine adjustment is nigh on impossible. A pan and tilt using steppers and lead screws and a good metal base would be a huge improvement Neither of those unfortunately make use of my new-found stepper- as-encoder knowledge ;-( > curtain positioning And yes, goodness, I've made a couple of those too !!! I've a picture on a CD somewhere. That was based on a cordless drill and its re- arranged gearbox with a daylight sensor. Surprising how much tug you actually need to open and close curtains, especially long drapes