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Progress Update

Today i started creating the schematic in Eagle.  I placed an sample order from Microchip to get some PIC16F4550. 

Parts i’m currently looking for:
- A voltage regulator which will boost the output of a 3V lithium coin to 3.3V and will automatically disable if the device is connected to the computer via USB.  If connected to USB then the computer will supply the 3.3V.  Thefore, the voltage regulator should ideally have an active low enable pin. 

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