AccelR8, A Homemade G-meter


Jesper has created an automotive performance meter using a handful of ICs. The key chip is the ADXL202 from Analog Devices. It measures acceleration while the AVR 8515 keeps track of time and does all of the calculations. All you need to do is enter the weight of the vehicle and the meter will calculate your 0-60 mph time, 60-0 braking distance, and maximum horsepower. There is a complete schematic on Jesper’s site, but the code still needs to have a few bugs worked out. This project is essentially a reproduction of the first generation G-TECH/Pro meter (bunnie has a picture of the original board). The new generation G-TECH meters are fun to play with and do interesting things like determining the engine RPM by measuring the noise in the electrical system.

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