3dpBurner2 voltage/current Meter

by villamany, published

3dpBurner2 voltage/current Meter by villamany Oct 5, 2015



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Simple box for a voltage/current meter. I designed this for the 3dpBurner2 3D printed laser cutter/engraver ( http://www.3dpburner.blogspot.com ), but it can be used for any other project.

Print on STL position without supports. I use it on the 12v main power line. I dont like the idea to use on the laser side due the meter can contain capacitors and could spikes the diode.

It´s ready to be fixed by using M3 stuff, double side tape or hot glue (i use double side foamy tape).

The meter i used comes with thin red and black wires and thick red, black and yellow wires.
See pictures for assembling (on some others the yellow wire comes blue instead).

Take care, usually there are two meter types with similar aspect, one for direct measuring 0-10A (this one) and another for measuring 10-100A where an external shunt is a need (not suitable for 3dpBurner consumption <10A)

There is a similar but temperature meter here: http://www.thingiverse.com/thing:1419583

UPDATED 16/MAR/2016 Added new version "meterVolCur.STL", the recommended one to print.

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I have a puestion, where (which input) should I plug in yellow 0V cord and red +12 cord on the laser driver?

Yes. From power supply black/red to the meter. And all loads connected to yellow (0v) and red (12v).
The black only goes from power supply to meter.

0V yellow, and red + 12V cable to where we connect. Is that the laser driver will connect to 12 V input. Can you give information.

Check your supplier documentation. I use mine on the main 12v line as pictured.


What does this display at full load of the laser ?

With me 0.18 A what is wrong because the decimal place would by one to the right .
1.8 A is correct

Yes, 1.5-2A is ok for ndb7875 and 2 or 3 motors. Maybe your meter is not ok.

I got 2 pieces one was mA Display 180 mA
The second was a 0.18 A display 10A

If you it is correct to 1.8 A ?

According to VA meters , the laser is set at 1.76 A , only the displays show the not feel right.

Put a link to the exact meters you got. The exact ones please.

maybe wifi is better ! but would involve changing arduino uno to a mega

i see on the photo has bluetooth. Please share it. Thanks

Oct 20, 2015 - Modified Oct 20, 2015
villamany - in reply to quocanhcgd

Yes!, i hope to share a tutorial soon on 3dpBurner blog. Basically you need an HC05 type bluetooth module with breadboard, an FTDI type device or similar for configuring it and do a small mod (jumper) on the CNC shield board for powering Arduino from 12v instead USB. Note the bluetooth is only capable of vectorial works due to his latency. For grayscale raster engravings you still need the USB cable.