Help with laser connections and config

[Alijambo73]

I just upgraded ro a duet 3 board and i'm having a struggle to figure out the best way to connect it and then configure the firmware. It will be an addition to a router on the same machine,

The router is on the out9 using 5V pwm. I was thinking of connectiong the laser to out0 and as I have tested it i hava not seemed to figure out the correct configuration. My other option is to use out7 but im still at a loss on the config and what other files would need to bae added.

The laser is a NEJE E40 with this interface board

I have treid it using the Input A connected to the out1 on the duet 3 with the pwm/ttl conected to V_fused and the ground to ground. My preferance woud be to use Input B.

My reprap knowledge is very basic so any conection and configuration advice would be welcomed. Thanks

[dc42]

@Alijambo73 I suggest you use one of the io_out pins to feed the TTL input of that board. As the input is stated to be TTL compatible, a 3.3V signal will be more than enough.

If the laser turns on at power up then add a pull down resistor between the TTL input and ground.

[Alijambo73]

@dc42 Thanks for the idea. So I decided to use io3.out. I have this in my config.g

M452 C"io3.out" F500 R255 S1 ; configure Laser port
M563 P1 S"Laser"

is this correct? I don't see anything showing in DWC for the laser, am I missing something, are there any other files I would need to configure outside of config.g?