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February 2005, Issue 175

Flexible Wireless Telemetry System


by B. Sobczyk, V. Formica, W. Sebastian, & K. Wertz
Start Mavric-II Board Sensor Board LCD Panel Board Sensor & Thermocouples Two-Axis Accelerometer Radio Radio Packet Stategy Data Logging Adaptable System Sources and PDF

DATA LOGGING

We saved the best part of the project for last. We created easy-to-use data-logging software, which includes custom ActiveX controls, custom graphics, and flexible data logging. The software provides a four-tab view of the entire system in easy-to-read gauges. It logs to a simple text file with the ability to save runs, simulate saved runs, and convert them to comma-delimited value files that Excel and MATLAB can use to graph the data. 

The PC software takes care of scaling the sensor data to actual values. This allows you to save the configuration for a sensor after it’s properly calibrated. The system linearly maps the raw data contained in the packets to actual values through a linear function. This file takes care of all the differences between the sensor’s values, frees up the microcontroller from doing conversions, and allows the system to calibrate and change easily.