An arduino based pager with Nokia 5110 display, receiving (possibly also sending) data via DRF1278DM

Used an Olimexino Nano, as it

• operates at 3.3v, so no levelshifter is needed for the display,
• it has an SD-Card slot "on board".
• is based on a Leonardo which means it has a 2nd serial connection so software serial is not needed.

Button one is used to switch backlight on and off, and reset/delete all messages after a long press (>1s)

Button two is used to see new Messages and iterate through new ones

Connections:

CE  | Pin 10
RST | Pin 9
DC  | Pin 11
CLK | Pin 13
DIN | Pin 12
BL  | Pin 8
VCC | 3.3V
GND | GND

GND | GND
VCC | 5V
RXD | Pin 1
TXD | PIN 0
SET | Pin 2 

Set on Pin 2 is unused right now. It should be used to trigger the wake up interrupt.