You’ve lost me. If your led won’t lase, then there is an issue with the led or the wiring. This works, I’ve done it. 
It’s also how other controllers drive your lps. It should directly drive your laser module in RF mode.
So I don’t follow what you’re talking about.
Sorry I should have explained better.
I cannot get my CO2 to lase using PWM, so I have to use the 0-5v CO2 setting in Lightburn.
However my LED requires PWM.
I have got a Voltage to PWM unit using a NE555 timer chip, but it does not start to sent a PWM until atleast 1.6v. I would like more range than that.
The other consideration is how fast or the frequency of the PWM signal is. Higher gives better cutting, and lower gives better engraving. This determines how long the laser is on at each point.
But because the unit I have is one set frequency, even though I can change the input voltage so that the duty cycle to the LED changes.
Currently I am investigating programing an Arduino so I can select the frequence depenting on task.. however 99% of the time I will be engraving, and using the output from the Rudia (0-5v) to change the PWM duty cycle.
I hope to have a very simple add on for CO2 lasers that anyone can do to get the very best of both worlds with their lasers.
Dave
I don’t think we’re communicating.
The pwm from the Ruida should drive your laser module directly without any other manipulation. Something is not right, it should work.
You need to find out why it’s not working correctly. The signals to these are very simple so it should be easy to figure out. Do you have just a voltmeter or a scope?
You are doing way too much manipulation of the signals that it not needed. Keep the KISS principle in mind when designing of this stuff.
Set the pwm frequency to 1kHz. This should work for any diode laser. At least until you make it work, then you can do what you wish.
Make sense?
Ok.. I have a 130W CO2 tube in my laser. This is perfect for cutting, but not so much for more delicate engraving..
So I want to add a LED Laser to the configuration so that I can utilise the 2 laser output capabulities of the Rudia 6445.
However the LED needs PWM.. Yes the Rudia can give that.. however I cannot get my tube to lase with PWM.. It wants a 0-5v signal.
So to use the other laser channel I need something that can convert the 0-5v to PWM just for the LED, since Lightburn does not allow you to mix and match tube types.
So..
Laser 1 is CO2 using the 0-5v output and the LOW signal to turn on the laser.
Laser 2 is LED, using the 0-5v output and converting it to PWM for the LED.
And as an advantage I can have several frequencies on the PWM to give better effects for engraving.
Hope this helps.
A Ruida generates pwm the entire time it’s executing a layer.
Then you have something screwed up.
The IN terminal of the lps will function as a dc or a pwm input. A 5V ttl signal will work just fine driving your led.
My laser is wired from the Ruida to the PWM input (IN) of the lps.
What you’re doing is setting this up so you have a tube and an RF mixed. The RF represents a digital laser, like your led. It would be much more simple to just change the mode to RF.
All of this is there.
If you don’t change it to RF, then the pwm will be generated continuously if you change it’s mode. You’ll have to figure out how to handle the L input of the lps.
Hi.
Ok - I have posted my work on a new topic. You might enjoy this. Thank you ALL for your help
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