Accelerometer - ADXL320
Accelerometer - Ana - ADXL320
Fig. 1 Accelerometer
Description:
This board is a 2 axis accelerometer. It implements the Analog Device ADXL320 2 axis ±5g accelerometer. It outputs the value of the 2 axis as an analog value. It can read vibration (dynamic) or gravity (static acceleration). The output at 0g is typically half of the power supply.
The board can be powered from 2.5 to 5V processor board.
Specifications:
Input voltage 2.5to 5V
InterfaceAnalogic
Range±5 g
Schematic:
As the ADXL320 takes very few extra components, the schematic is extremely simple. C1 filters the power supply, C2 and C3 the output voltage for the 2 axis. The 2 axis can be measured on K1 and K2, which also provide power supply. This is it !
Fig. 2 Analog accelerometer schematic
Construction:
The PCB fits on a small single sided board. The components are soldered on the top (copper) side.
Fig. 3 Analog accelerometer layout
Start with the accelerometer U1. It is the smallest component and is a bit of a pain to solder. But if you put some tin on the tracks before, clean them well with copper mesh, it should be straight forward. Continue with the capacitors, which can be smd or classic. Finish with K1 and K2. I added a drop of glue from a glue gun to secure the chip on the board.
| I2C Keypad Component list |
|---|
| C1: 100 nF C2, C3: 4.7 nF U1: ADXL320 K1, K2: Connector AMP MT 3 pins male |
How to use / Testing:
To check the board, power it up on K1 or K2 (2.5 to 5V). When on a flat surface, you should read about half of the power supply on the outputs. Tilt the board and check the output voltage change.
To check it fully, you need a processor board running the Analog accelerometer tutorial.
Files and links:
Eagle PCB and schematics files for analog accelerometer.PDFs of PCB, layout and schematics of analog accelerometer.
PIC Tutorials for analog accelerometer.
Analog Device ADXL320 2 axis ±5g accelerometer.