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Gravity Plug v1

The Gravity Plug is a small board containing a MEMS-based 3-axis accelerometer, connected via I2C. The standard Plug uses the Bosch Sensorted BMA020 chip, the ‘T’ version uses a later BMA150 chip. This version adds access to the integrated temperature sensor.

The range of the accelerometer can be adjusted between ±2g .. ±8g.

Configuration

There is nothing to configure. The accelerometer on this plug responds to a fixed I2C address of 0x38.

Header Pinouts

Design Info

Dimensions: 21.1 x 24.1 mm
CadSoft EAGLE design files: see below.

This board uses the conventions of a JeePlug and can be used with the ports on a JeeNode. It can also be used with other boards and MCU’s, if you hook it up properly and adapt the interface code for it.

How to Get It

http://jeelabs.com/products/gravity-plug

Marking note

For economy, the standard and ‘T’ version use the same PCB. In the ‘T’ version case, the silk screen chip label BMA020 does not match the BMA150 chip installed . Both versions use the same support library - the temperature value returned only has meaning for the ‘T’ version.

Related Weblog Posts


gp1.DSC_1262.jpg (8.26 KB) myra, 2012-07-17 13:26

gp1._00000180.png (23.2 KB) myra, 2012-07-17 13:26

jlpcb-081.pdf (9.1 KB) myra, 2012-07-17 16:14

jlpcb-081.brd (8.52 KB) myra, 2012-07-17 16:14

jlpcb-081.sch (11.4 KB) myra, 2012-07-17 16:14

jlpcb-081.png (61 KB) myra, 2012-07-17 16:14