Here’s a demo of the MMA7455L 3-axis accelerometer in SPI mode using the Bus Pirate. We’ve got this sensor on a breakout board for $15.
The MMA7455L has:
- 2/4/8g selectable measurement range
- 10bit or 8bit output
- force and pulse detection with interrupt
- I2C and SPI interface
- 3.3volts
Get the MMA7455L breakout board for $15 at Seeed Studio. That’s about $5 cheaper than other accelerometer breakouts we’ve seen recently.