I need to re-work on this part. I tried to use a Relay I/O board and a timer and was tying to find out laser usage time but then figured out that the laser output rate was faster than the relay board could responible. The laser may fire about 45s and I could get get a few seconds showing on the counter. I lost money for renting the machine to a customer doing knife engraving in my shop

. Lucky though it wasn't a big time. I charged him flat rate

He used my 60W to engrave some logo on his stainless knife (surface has some sort of coating on it).
So, I need to think think and may need to design a simple triggering circuitry to make it work better
Marco