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reference/waveshare_SX1268_LoRa_HAT/README.md

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+# LoRA HAT pins
+This is derived from the schematics; showing the 5 specific pins used (only)
+
+```text
+looking down, Pin1 is top left, Pin40 bottom right
+
+        3v3  -- o o -- 5v
+                o o -- 5v
+                o o -- GND
+    AUX  ------ o o ------ TX (set to USB serial via jumpers on HAT)
+         GND -- o o ------ RX (set to USB serial via jumpers on HAT)
+             -- o o --
+    M1   ------ o o -- GND
+    M0   ------ o o --
+         3v3 -- o o --
+             -- o o -- GND
+             -- o o --
+             -- o o --
+         GND -- o o --
+             -- o o --
+             -- o o -- GND
+             -- o o --
+             -- o o -- GND
+             -- o o --
+             -- o o --
+         GND -- o o --
+
+```
+The three fixed pins used by the HAT are 7,13 and 15.
+These map as follows:
+* `AUX` is on `PB7`
+* `M1` is on `PD22`
+* `M0` is on `PB0`
+
+The Serial (TX,RX) is deselected via onboard jumpers, a secondary serial will be jumpered to the module TX/RX instead.
+
+## References
+#### Lora HAT
+https://www.waveshare.com/wiki/SX1262_868M_LoRa_HAT