Installing Laser / Driver Board into CNC Controller Box

00:02 Ok so the next stage of this controller box project or build, is to add one of these step-down voltage regulators to drive the laser driver board.

01:45 Ok so the first thing I’m going to do is wire up the power cable to this step down voltage regulator, and I’m going to wire it up the same way I did the GRBL shield with the option of using a e-stop to cut power to it, and also therefore the driver, the laser driver.

03:03 Ok so I’ll just show you the first part and I’m not going to wire this up yet but this is what it should look like. You have the two terminals that go from the power supply unit into the voltage regulator via what will be the e-stop. And literally connect this way around from there to there.

03:27 The laser originally came with this power supply unit and Big Clive done a review of the power adaptor and it’s pretty scary. I don’t think I’m going to use this with anything ever but what I would like to try and do is utilise the power connection and this half of the cable.

04:55 I am now going to set the voltage output to 12v and I do this by using the voltmeter to give me a reading, and terming one of the pots on the board.

05:46 I’m just soldering the aviation panel mounts now and wiring everything up.

08:03 So I ran into a new problem where the driver board was powering the laser even though the selection switch was set to the middle position. It seemed whatever I had done to compensate for my relay module being of the active low variety was causing another problem with the driver board. Nathan lent me a 10k pull-up resistor and suggested wiring it between the 5v terminal and the single enable pin on the TTL input on the driver board. This seemed to work and produced a valid logic level, whatever that means, but when I plugged the USB cable into the laptop whatever I’d done had reversed and the laser came back on.

09:59 I’m not sure why this is designed the way it is, and if anyone know the correct way of inverting this please do share that information in the comments.  I think I am a step closer to the having a controller which can swap between a laser and relay spindle although the real test will when sending a file to the machine.

10:25 I’ll save how I did all of that for another video but I’m just going to show you that it now works.


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