Design of wearable battery powered online gps tracker

Design of tiny wearable GPS tracker Overall goal: - Design of wearable-, battery powered-, internet connected- gps tracker. Design guidelines (in order of importance): 1. Smallest possible PCB size. 2. Good battery life (power efficient components). 3. Cheap component list (BOM). Required functionality: - Power supply circuit for running device off battery power. - LiPo battery charging circuit for charging connected LiPo battery from charging pins. - On board MCU with at least 32Kb flash and >= 2Kb SRAM (mega32u4?). - Integrated GPRS modem module (SIM800/SIM900?). - Integrated GPS module (ublox-6?/SIM900?). - Small GSM antenna connector on PCB. - Small GPS antenna connector on PCB. - On/off button for battery power. - 3 external pins available for network status LEDs, controllable by MCU. - 2 external pins available for charging status LEDs, controlled automatically by LiPo charging circuit. - PCB mounting holes. Required electrical interfaces: - On board micro USB host interface. Used for charging LiPo battery and communicating with device firmware. - JST connector for replacable LiPo battery. - JTAG connector for debugging system firmware. - ISP connector for programming MCU. - Charging pins for +5V to charge LiPo battery. - UART interface for debugging. - (standard) SIM card holder. Maximum PCB size: - 35mmx35mm or smaller if possible. Deliverables: - Design of PCB. - 5x prototype PCB including components and postage to supplied address in Sweden. - Source files (board layout, schematics). The PCB shall bascially be a combination of these 3 olimex boards in one custom PCB: - [login to view URL] - [login to view URL] - [login to view URL] Another link for inspiration: - [login to view URL]