HI, I was previously running with GRBL and got full laser power at 5V

Lasers
, ,
21

@StephaneBUISSON
https://drive.google.com/open?id=0B5_IWI68ZqZTZzVyRHB1RlRLeTg
Is this hat you mean?

If not, please correct it

22

+Peter van der Walt https://drive.google.com/open?id=0B5_IWI68ZqZTcF9BVUd4OHBUbUE

like this?

Can’t I directly connect WP to GND, that’s what I did when running with smoothie?

How can I calculate the laser PWM frequency?

23

+Peter van der Walt My configuration is same as yours and I already setup a laser fire pin.

But 3.3V pwm at LV side only giving me 3.6V PWm at HV siide. I measured all the voltage using DMM

HV -GND= 4.98V
LV-GND = 3.3V
LV1-GND = 3.3V (S1 COMMAND)
HV1-GND = 3.6V

https://drive.google.com/open?id=0B5_IWI68ZqZTbEp1TGVQOVFzWm8

This is my current connection please take a look at this

24

+Peter van der Walt
Did you check my connection, I want someone to make sure connection is correct except for wp through some protection, I will set up it as soon as I get a water flow sensor
https://drive.google.com/open? id=0B5_IWI68ZqZTbEp1TGVQOVFzWm8

How can I calculate the PWM freq?

25

+Peter van der Walt @StephaneBUISSON
I figured out what’s the problem.

10K pull up resistor on the HV side of logic level converter was too large in my case. I figured this out by doing,

  1. connected 5V to IN terminal by a wire , measured voltage across it. Got 4.95 on DMM.
  2. Connected 10K between IN and 5V got 3.7V if TL is not grounded and 4.04 when grounded. What I need is 5V when TL is LOW.
  3. Connected 1K between in 5V and IN , got 4.8V at both TL disconnected from GND and at TL is LOW

I think this is due to the high input impedance of IN terminal

https://learn.sparkfun.com/tutorials/pull-up-resistors

So replaced 10K with 1k in logic level converter and I’m getting around 4.8V for S1(100% duty cycle)

Also ordered https://www.sparkfun.com/products/11771 and CD4050 .
I’ll check those too

26

good to know, thx

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This is the level shifter I purchased

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@Alex_Krause did you check the voltage b/w IN and GND?

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+Peter van der Walt https://drive.google.com/folderview?id=0B5_IWI68ZqZTTlZyeEx0aDdmRGc&usp=drive_web

Sorry I didn’t see that request

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https://drive.google.com/open?id=0B5_IWI68ZqZTMEllamlZX3lQWVE

Do I have to remove # from all the lines?

31

@Athul_S_Nair ​ on my laser PSU? Not sure where you want me to check

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@Alex_Krause yeah between IN and GND for S1 command

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It’s labeled as 5v on the PSU but I haven’t thrown a multimeter on it yet

34

@Alex_Krause
can you check it?

35

In the idle state or under movement?

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@Alex_Krause Idle state it would be 0, I want know the voltage when doing a job with full laser power(S1)

37

I can check but I have an analog machine don’t want to go above 15ma for the sake of keeping my tube operational

38

@15 ma I get 3.48v @10ma I get 3.63v @ 5ma I get 4.18v @ 1ma I get 4.78v… I have to test the output of the potentiometer to get my reading my terminals are covered in hot glue on the PSU

39

@Alex_Krause Those current readings are form your laser machine?
I mean current taken by the tube ?

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@Athul_S_Nair ​ it looks like my In pin is pulled Low for more power