* Use dual LDO
* Add I2C EEPROM
* Update RESET switch
* Add bulk cap to STM VCC
* Add diode on debug VCC
* Add bead for sensor filter
* Use separate USART
* Remove power switch and its decoupling cap
* Resize the mounting holes to 2mm
* Connect the switch to NRST instead of BOOT0
* Change RGB LED footprint to PLCC-6
* Change switch footprint
* Add extra pads to usb connector
* Remove crystal and load caps, use ceramic resonator