Axivity WAX3
From Hackstrich
The WAX3 is a wireless accelerometer that talks MiWi over 802.15.4. Source code/schematics/etc. are available at Open Movement's Google Code
| Start Byte | Length (bytes) | Description | Format |
|---|---|---|---|
| 0 | 1 | Report Type | Always 0x12 = USER_REPORT_TYPE |
| 1 | 1 | Report ID | Always 0x78 (ASCII 'x') |
| 2 | 2 | Device ID | |
| 4 | 1 | Device Status | Bit 0 = battery warning, bits 1-7 = reserved |
| 5 | 2 | Analog Sample | Top 6 bits are measurement info, bottom 10 are measurement |
| 7 | 2 | Accelerometer Info | Top two bits is G-range, next two bits is format (0=10-bit raw -> 3x10-bit + 2, 2=signed 16-bit), lowest four bits is the rate code: frequency = 3200 / (1 << (15-(n & 0x0f))) 00=±16g, 01=±8g, 10=±4g, 11=±2g |
| 9 | 2 | Sample Sequence Number | Resets on sleep |
| 11 | 1 | Number of samples left to transmit after this packet | 0xFF = 255 or more |
| 12 | 1 | Number of samples in this packet | |
| 13 | ??? | Sample Data |
