Use ID constant in ruggeduino example

trickeydan · trickeydan · commit 67e9a3dee558 · 2021-10-30T15:58:49.000+01:00
diff --git a/programming/sr/ruggeduinos/custom_firmware.md b/programming/sr/ruggeduinos/custom_firmware.md
@@ -136,7 +136,7 @@ from sr.robot import *
 
 RUGGEDUINO_ID = "752303138333517171B1"
 
-R = Robot(ignored_ruggeduinos=["752303138333517171B1"])
+R = Robot(ignored_ruggeduinos=[RUGGEDUINO_ID])
 
 ser = serial.Serial(R.ignored_ruggeduinos[RUGGEDUINO_ID])
 
