|Posted by cat's squirrel on August 9, 2012 at 11:00 AM|
I've just received my rotary encoder from Hong Kong, it will be used to measure the rotational speed of my Lenco turntables, by connecting to the spindle with a Michell clamp and CNC coupler.
Readout will be from a 5 digit rev counter. The problem is, all the necessary info is in Chinese, but I'm sure I can work it out.
Here's a pic:
Inside the encoder is a disc with 1000 slots in it. For each revolution of the turntable platter, it outputs 1000 pulses, which are counted with a rev counter, so 33.333 revolutions/minute should produce 33,333 pulses on the rev counter.
I have received the tachometer, and hooked it up to the encoder. First look gave a result of 33457, not bad at all. I just need to fit a load resistor, and construct an arm to steady the encoder.
Had a problem with the setup, it would work for about 30 seconds, then the readout would blink. Eventually, I realised that the battery I was using as a power supply was dipping to too low a voltage. Replacing it with a wall transformer (12v 1.2A) kept everything working perfectly. Should be working by the end of the week.