College Of Computing at Georgia Tech have a great DIY Bluetooth accelerometer with source and schematic included.
Overview:
This is a small wireless sensor platform providing a bluetooth SPP link to three axes of accelerometer data. The accelerometers are sampled by a PIC microcontroller (onboard ADC) at roughly 100Hz (rate can be changed via firmware). Data from the ADC conversion is sent to a remote computer using the PIC's UART in conjunction with a drop-in bluetooth serial part. Even with two dual-axis accelerometers onboard there are up to 17 free I/O lines and two additional ADC channels depending on the device configuration. Three sockets provide access to all PIC signals. Over-the-air programming allows for easy firmware updates and rapid prototyping without the need to have a PIC programmer or special cable. Schematics, parts lists, and firmware sources are available online.
Feature List:
- Bluetooth serial port profile (SPP) for standardized interface
- 3-Axis accelerometer data, 3.9mg resolution (ADXL202JE)
- Reprogrammable PIC (16LF873-04I)
- 17 free I/O lines
- In-Circuit programming connector
- Over-the-air programming via bootloader
- Battery life ~60hrs on 840mAh 3.7v battery, full TX mode
- 13mA @ 3.7v TX mode, 3mA @ 3.7v standby
- Very Simple Firmware
- 35mm X 35mm X 5mm
Contextual Computing Group: Bluetooth Accelerometer - Link
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