hyg-usb_firmware
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hyg_usb is a Temperature and Hygrometry USB sensor based on a PIC 16F1455 
with a SI7021 ( see http://www.macareux-labs.com for details and schematics )

It comes with this firmware ( a simple USB stack in C ) preinstalled so you can
start using it with a cli interface.

But above all, it's a sensor you can HACK with just a pic programmer such as 
pickit2 or pickit3. We hope you'll find this useful : have fun !!!