RAK2245 96 Board with pi zero

Here are the connections you need between a RAK2245 Stamp Version (use the Edge Connections) or the RAK2245 96 Boards (use the 40 pin socket). You can use the edge connection on the 96 Board version if you like.

You can find the layout on the RAK web site -
96 Board
https://downloads.rakwireless.com/en/LoRa/RAK2245-96Boards/Hardware-Specification/RAK2245-96Boards_User_Manual_V1.2.pdf
Stamp Version

Raspi             RasPi Name	RAK2245 	RAK2245        RAK Description
Physical                        Edge            96 Board
Connection		        Connections     Connector

1	           3.3 Volt     A4	        35             IO Reference
2	           5 Volt       A3              37             5 volt
4                  5 Volt       A3              37             5 Volt
6                  Gnd          A1, A2,         1, 2, 39, 40   Gnd
                                B1, B2, C1, C2,
                                C3, C4, C5 ,C6	
11                 GPIO 17      A13             6              Radio Reset
19                 SPI 0 MOSI   A8              14             SPI0_DOUT
21                 SPI 0 MISO   A10             10             SPI0_DIN
23                 SPI 0 SCLK   A11             8              SPI0_SCLK
24                 SPI 0 CE0    A9              12             SPI0_CS