Posts Tagged Li-Ion

GPS Logger V – Full hardware

Having determined the battery and power requirements, a full schematic of the GPS logger was made. Buck regulators and Li-Ion battery chargers were investigated from a variety of manufacturers. The TC105 3.3V Buck regulator and the MCP73863 4.2V Li-Ion battery charger, both from Microchip, were chosen to provide the power needs for the project. The circuit is capable of detecting if a USB port is a Charging Port and adjusting the battery charge current to suit.

GPS Logger Schematic implementing battery charging and USB Charger Port Detection

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GPS Logger IV – Power and Batteries

The prototype is at the stage of being able to successfully achieve GPS lock, log the received coordinates, waypoints and go to sleep. The power usage of the system needed to be analysed in order to specify the battery requirements. The current draw was monitored after the 3.3V regulator as the device was put into its various modes.

Looking at the current draw of the PIC, SD Card and GPS receiver Read the rest of this entry »

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