[Guide] Using Grbl to debug your homing switches

[LarryM]

@JamiePhillips

Do you have your Arduino Serial Monitor configured as requested in this thread?
(and also what is the response that you get from the ? command?)

Using Grbl - Direct Communication

Direct access to grbl. You can interact with grbl directly to isolate problems at the low level. To do so, you need to use a terminal type program to issue commands and get responses from the serial port that has the Arduino attached. Some of the programs are HyperTerminal, Putty, UGS (limited access), and the Serial Monitor in the Arduino IDE, among others. Make sure that you have the correct settings for the program that you use. The COM port where the Arduino is attached should have the …