PWM Controlled Laser Diode

Muhammed

Hello,

I would like to install a laser diode, that has two wires and a requirements of 5V and 25mA (https://thepihut.com/products/line-laser-diode-5mw-650nm-red), on my Duet 2 Ethernet card.

My plan was to control this laser diode using the PWM fan2 outputs. The PWM are fed with Vin=24V because I need to use them for fans.

Is there a way to control the output voltage and set it to 5V so I can control and power the laser diode?

My initial code as I followed through the documentation will be like:

M950 P0 C"fan2" Q500   ; Define the PWM output on fan0
M42 P0 S0.5            ; Turn the PWM output on with a 50% duty cycle
.
..
...
M42 P0 S0              ; Turn the PWM output off

Can I just use the M42 command to set the PWM percentage at the corresponding value to the voltage I need? do I need to use other codes?

Sorry but I am new to these stuff and any suggestion or recommendation will be highly appreciated. Thanks!

dc42

@Muhammed connect the diode between the OUT_NEG pin of the fan port and +5V which you can pick up from the PanelDue port.

Muhammed

@dc42 said in PWM Controlled Laser Diode:

@Muhammed connect the diode between the OUT_NEG pin of the fan port and +5V which you can pick up from the PanelDue port.

So the +5V will come from the PanelDue port and the other wire will be on the ( FAN- )negative of the PWM fan port and I will still use the same code to control it through the PWM port. I hope that I understood right? will the current be enough in this case?

Thanks alot

jay_s_uk

@Muhammed correct. the paneldue port can provide more current than required for your diode

Muhammed

@jay_s_uk said in PWM Controlled Laser Diode:

@Muhammed correct. the paneldue port can provide more current than required for your diode

Great!. Thank you, I will give it a try