How to write a program for sensor.

Oct 23, 2009

Is the problem interface or programming?
by: Anonymous

The programming for ADC is relatively straightforward. You turn on the ADC module, wait so many clock cycles, and read the result. I assume your problem will be more with conditioning the very small signal from the strain gauge and getting that into the MCU. Assuming a resistance bridge is used with your gauge try feeding that to an instrumentation amplifier built with 3 opamps. High input impedance and high CMRR are very useful characteristics of op amps for this application. Using one will get you some amplification, filter out a lot of noise, and also bring a differential analogue signal to a single ended signal which can be hooked up to an analogue input on the MCU or further amplified if needed.

One suggestion for the programming. Keep the converted reading in its binary format as long as possible if you need to do any manipulation. Real numbers are memory hogs and take more processing time.

How to write a program for sensor.

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How to write a program for sensor.