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Acceleration Monitor using ADXL202 and AVR

The schematic show that the AccelR8 only uses 3 IC's. An AVR 8515 microcontroller do the calculation work and controls the other circuits. An MAX603 controls voltage and power-on/power-off. And the chip that makes it all possible, the ADXL202 from Analog Devices measures the acceleration.

This chip is a small wonder. It uses a tiny micro machined polysilicon structure on the silicon wafer. The structure is part of a capacitor, so deflection of the structure (by acceleration) can be measured.

The ADXL202 can measure acceleration in two axes, and if you have a Microsoft Freestyle Gamepad, you already have an ADXL202 !

In this case, we only use one of the axes, and the ADXL202 outputs this data as a variable duty-cycle squarewave. The 8515 calculates the acceleration by measuring the pulsewidth/period relationship. The acceleration is then used in further calculations, and the resulting data is show on the display.

Acceleration Monitor using ADXL202 and AVR Diagram
Click on Circuit for better view

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