Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up

otaku521 · 14 Jan 2020, 15:37

@dc42 updated wiring

otaku521 · 16 Jan 2020, 02:40

Dear everyone,
is the above correct? (wiring and config)
much appreciated

Thx
Tony

DeltaCon · 29 Apr 2020, 09:32

@otaku521 said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

hooking it to fan... will it still work with g1 sxxxx like commands? if so how to declare it? can you help? how to invert the pin config? using "i1"?

Yes 12v plug goes directly to 12v supply

Did you ever get this question answered? I find myself having the same question. Since Duet boards can be jumpered to give 5V on the fan output, that seems like an ideal method for connecting a laser. But there is so much contradicting information about this topic. Having g1 sXXX comands (Grbl style) is by far preferable indeed.

dc42 · 29 Apr 2020, 09:43

@otaku521 said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

Dear everyone,
is the above correct? (wiring and config)
much appreciated

Did you get this working? The only think I can see wrong is that you have used the heater 7 output on the breakout board, but P6 (instead of P7) in the M452 command in config.g.

@DeltaCon said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:
Since Duet boards can be jumpered to give 5V on the fan output, that seems like an ideal method for connecting a laser.

Except that the laser would be on at power up, until the Duet executes the command to configure that fan and turn it off.

Another (safer) way to drive a laser would be to pick up the 5V signal from the gate of one of the heater output mosfets; but this would void the warranty on the Duet.

But there is so much contradicting information about this topic. Having g1 sXXX comands (Grbl style) is by far preferable indeed.

Yes, which is why RRF supports those commands.

DeltaCon · 29 Apr 2020, 10:09

@dc42 said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

Another (safer) way to drive a laser would be to pick up the 5V signal from the gate of one of the heater output mosfets; but this would void the warranty on the Duet.

Thanks DC, I will look into that.

Perhaps it would be a nice idea, in a future revision of the board, to add a set of pins, shared with a heater, specifically for connecting a laser. There are quite many questions on the forum about lasers, and it would prevent people from using lesser safe methods or voiding warranty.

Some years ago I upgraded ma RMaxv2 with a duet board and trashed the Rambo. Now I am building a laser CNC machine, I thought I could reuse that Rambo board, but this Arduino, Marlin and Grbl stuff is really terrible to wrap your head around once you are used to Duet configurations

dc42 · 29 Apr 2020, 10:13

@DeltaCon said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

Perhaps it would be a nice idea, in a future revision of the board, to add a set of pins, shared with a heater, specifically for connecting a laser. There are quite many questions on the forum about lasers, and it would prevent people from using lesser safe methods or voiding warranty.

We have done this on the Duet 3 main board starting from revision 1.0.

DeltaCon · 29 Apr 2020, 10:31

@dc42 said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

We have done this on the Duet 3 main board starting from revision 1.0.

That's great, but I don't think I can get a Duet 3 for the price of a Maestro plus a JST connector (meaning that this is a BIG stepup pricewise). Apart from the laser connection, a Maestro is by far powerful enough to handle a simple XYYZ machine I think.

dc42 · 29 Apr 2020, 10:34

@DeltaCon said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

@dc42 said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

We have done this on the Duet 3 main board starting from revision 1.0.

That's great, but I don't think I can get a Duet 3 for the price of a Maestro plus a JST connector (meaning that this is a BIG stepup pricewise). Apart from the laser connection, a Maestro is by far powerful enough to handle a simple XYYZ machine I think.

The replacement for the Maestro that we have started designing will have a suitable output for driving lasers with TTL-compatible inputs.

DeltaCon · 29 Apr 2020, 10:40

@dc42 said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

The replacement for the Maestro that we have started designing will have a suitable output for driving lasers with TTL-compatible inputs.

That's good news!
I would not hold my breath would I?

dc42 · 29 Apr 2020, 10:42

@DeltaCon said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

@dc42 said in Duet2Wifi Laser Diode (2pin Power + 2 pin TTL type) hook up:

The replacement for the Maestro that we have started designing will have a suitable output for driving lasers with TTL-compatible inputs.

That's good news!
I would not hold my breath would I?

No, it will be several months before it is in production. It will almost certainly cost more than the current Maestro, but it will have a higher specification.