1. Theory of Operation and Hardware Design

2. PIC18F45K20 Microcontroller use at least 9 channels of ATD conversion with 2 more used for reference voltage 1 SPI used for SD interfacing 2 TTL pins for RS232 interfacing Operating Voltage: 1.8V to 3.6V 1.6-12 mA

3. Could not find tri-axis accelerometers available with required g measurement range, so two x-axis and 1 z-axis accelerometers will be paired. The Matchport has an embedded web server and output pins programmable from embedded software interface. Accelerometers Freescale MMA1212 and MMA2301 Accelerometers  x-axis and z-axis Operating voltage: 5 V Operating Current: 3-6 mA Analog output between 0.5V and 4.5V Matchport b/g Wireless Adapter Operating voltage: 3.3 V Operating Current: 20-223 mA Connected to microcontroller via RS232

4. The SD card will be interfaced with SPI using the integrated SPI on the PIC18 microcontroller. SD Card Connect through SPI  4 pin interface Operating voltage: 3.3 V

5. Maxim MAX8856 Battery Recharger USB or AC input 3.5-4.2V SYS output Maxim DS2784 Fuel Gauge Operating voltage: 2.5-4.6V Ultralife UBBP01 Lithium Ion Battery 3.7 V rechargeable 1800 mAh