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who-ha Posted - Apr 23 2007 : 01:42:29 AM
I was wondering how to hook up the speed-o-meter, tachometer ect to my computer. I can do the programming myself. I just need help with the hardware, and possibly an example on how to communicate with the device via qbasic.

Thanks.
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Aaron Cake Posted - Apr 23 2007 : 09:25:44 AM
Both the tach and speedometer are likely going to be PWM (for speedometer) or just a sine/square wave of varying frequency (for the tach). The easiest thing to do would be to build a small microcontroller based circuit (take your pick of easy micros to work with...ie. BasicSTAMP) to measure the actual frequency and then send that in a data stream to the PCs serial port. That will be easy to read in QBasic.

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