Requirements
- Deck of cards form factor: 3" x 3" x 1"
- Long Battery Life
- Configurable update frequency
- 1 day @ once per 30 seconds
- 1 month @ once per 15 minutes
- Multi-month standby with wake on motion
- Configurable update frequency
- Local data logging
- PC-based software
- Configuration
- Offline data viewing
Technical Specifications
| Part | Price | Datasheet |
|---|---|---|
| Inventek ISM300F2 — 20 Channel GPS High Altitude Capable | $32.95 | (pdf) (NMEA Spec) |
| Taoglas AP.10D.01 — GPS Patch Antenna, 10mm | $21.05 | (pdf) |
| ADF7012 — Frequency Agile FSK Transmitter IC | $4.28 | (pdf) |
| MRF1513 — 3 Watt RF Power Amplifier | $7.67 | (pdf) |
| ATMega324PA — Microcontroller | $5.77 | (pdf) |
| LT3489 — Boost converter for 3.7V → 8V | $3.90 | (pdf) |
| 16Mbit Atmel Dataflash Storage | $2.26 | (pdf) |
| 3 Axis I2C Accelerometer | $1.21 | (pdf) (setup) |
| USB communication | $4.50 | |
| LiPo Battery Charger | $0.94 | |
| SMA antenna connector | $3.92 | |
| Aluminum Enclosure (80mm x 71mm x 19mm) | $7.42 | (pdf) |
| 3.7v 2000mAh LiPo battery | ~$10 | |
| Temperature Stable Reference Oscillators | $6.41 |
PCB Design
The printed circuit board version 1.0 was developed in Altium and fabricated by Advanced Circuits.
Here is a PDF of the schematic and board: PDF