Using Cheap Chinese Calipers as encoders

[arniepj]

I have read the 52 bits of data out of a Mitutoyo dial indicator with a pic.The clock signal is tied to an interrupt pin and the data is read into a 52 bit array.The data can then be manipulated however necessary.The Chinese calipers while different, can probably read in a similar manner.

[Archangel]

Thanks arniepj,
So if I got this right, output the clock and data pins through a couple of comparators or OPAmps, to get levels up to 5 volt levels, and hook the clock pin to an interrupt on change pin then read the data into array, sounds simple enough, I have to read up on getting the data out of an array, in a way I can use and understand it.

Thanks
JS

[arniepj]

I used a 16F877 with the data tied directly to portb.1 and the clock tied directly to portb.0.Enabling the weak pull up resistors was all that was needed.I believe the signal voltage levels were on par with the caliper levels.Looking at the link waveforms,I would start by capturing the pause in between the clock pulse groups as an indicator to start clocking the data.

[Archangel]

Thank You.