After playing around with the first Prototype of LoPSy (LoRa Paging System ;-) ) and the first range test went well, I wanted to start with a new hardware revision.

The first hardware prototype contained a Nokia display, AI-Thinker Ra-02 433 MHz LoRa module and an ATmega328 µC. 

For the new hardware revision I would like to replace the mentioned components and add few more functions.

Some requirements:

• SMPS instead of linear regulator
• 1-cell LiPo charger IC

• ATSAMD21 microcontroller (compatibility with Arduino Zero MKR (and Adafruit Feather?))
• Get rid of the Nokia Display
• uSD-card
• tiny pager motor
• buzzer
• to be defined...