Laser Control panel

An intuitive interface for grbl Laser Cutters with automated safety monitoring using an arduino Mega

Features

• Automatic halting grbl when safety is compromized (like lid opened, tube too hot, water stopped flowing, emergency stop triggered)
• Laser can only be enabled is all safety is met
• Physical buttons to pause and resume a job
• Screen and lightbar to monitor laser tube temprature

Laser Contol Panel IRL	Demo of automatic halting as lid opens

Wiring the arduino mega

Output control buttons

Item	button pin	led pin	output pin	output type
Laser enable	35	24	22	Direct connection to laser PSU
Stepper motor enable	37	26	8	Direct connection to stepper driver
Air assist enable	39	28	A8	Relay board
Exhaust fan	41	30	A9	Relay board
Water cooling pump	43	32	A10	Relay board
Position indication light	45	34	7	Direct connection powering 5v laser diodes
Internal lighting	47	36	A15	Relay board

GRBL controls

Item	button input pin	output signal pin
Continue	49	9
Feed hold	51	11
Soft reset	53	10

Halted indicator led  --> pin 46  
GRBL stepper control output ( GRBL pin 8) --> pin 12

Safety input signal

Item	input pin	status led pin
Cooling water flow	4	38
Top door/cover switch	5	40
Front door/cover switch	6	42
Emergency stop	3	44

Temperature monitoring

Temperature leds:
red     --> 48
orange  --> 50
green   --> 52

ds18b20 one wire bus  --> 2

Others

Relay control main power in  --> pin A12

LCD-screen with i2c backpack is connected --> at scl and sda  
Screen backlight --> pin 13

Wiring

Wiring buttons and leds etc	Laser cutter wiring

If you would like some schematics open an issue and i might put some time into that. But i expect most of it to be straight forward enough, and you might need to modify some stuff to best suit your machine.