Use GPIO 17/27 depending on architecture

internal/hw/gpio.go

@@ -7,16 +7,6 @@ import (
 )
 
 const (
-	pinDoorOpen    = 17
-	pinFanPower    = 22
-	pinCoolerPower = 23
-	pinHeaterPower = 24
-	pinLightsPower = 25
-
-	// GPIO21 is located at pin 13 on RPi 1B rev 1. Rev 2 and never boards
-	// has GPIO27 here.
-	pinOneWirePower = 21
-
 	off = 0
 	on  = 1
 )

internal/hw/pins_arm.go

@@ -0,0 +1,15 @@
+//go:build arm
+
+package hw
+
+const (
+	pinDoorOpen    = 17
+	pinFanPower    = 22
+	pinCoolerPower = 23
+	pinHeaterPower = 24
+	pinLightsPower = 25
+
+	// GPIO21 is located at pin 13 on RPi 1B rev 1. Rev 2 and never boards
+	// has GPIO27 here.
+	pinOneWirePower = 21
+)

internal/hw/pins_others.go

@@ -0,0 +1,15 @@
+//go:build !arm
+
+package hw
+
+const (
+	pinDoorOpen    = 17
+	pinFanPower    = 22
+	pinCoolerPower = 23
+	pinHeaterPower = 24
+	pinLightsPower = 25
+
+	// GPIO21 is located at pin 13 on RPi 1B rev 1. Rev 2 and never boards
+	// has GPIO27 here.
+	pinOneWirePower = 27
+)