Schematic
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Use MCP73831 to charge 3.7V battery.			PLACED
Use TPS62046DGQ for 3.3V regulation.			PLACED
HM-11 bluetooth module.							PLACED
4bit mode lcd at 3.3V.							PLACED
Use current sense resistor PWR263S-20-R500F.	PLACED
Place SD card holder.							PLACED
Use solid state mosfet relay ASSR-1611-501E.	PLACED