DIY Laser Power Meter v2.0 by Kalmito (Arduino+OPHIR 20C/150C)

Hi everyone,

I’d like to show my self-built LPM (Laser Power Meter) that I made for Ophir heads. My goal was to build a simple, easy-to-use, portable, battery-powered meter that works well on its own and can also handle multiple sensor heads.

The unit is based on an Arduino + ADS1115 + 128x128 OLED display, and it is controlled with 5 buttons. The screen continuously shows the current power, peak value, average value, battery voltage, and also a graph of the measurement history.

At the moment, I have added support for these two Ophir heads:

• OPHIR 20C-A-1-Y
• OPHIR 150C-A-.1-C

After startup, the connected head can be selected from a menu, and the meter uses the appropriate scaling for it. It was important to me to keep the operation simple, so I tried to make both the menu and the display as clean and straightforward as possible.

Main features:

• Current power display in mW / W
• PEAK value display
• AVG value display
• Graphical history display
• Cursor-based review of measured points
• Battery icon
• Ophir head selection menu
• Audible feedback for some functions
• Serial data output compatible with the Peregrine software

Controls in short:

• F / B buttons for moving up and down in the menu
• OK button for selecting the connected head
• During measurement, the left / right buttons can be used to move through the graph
• Long button press for delete / reset function

One advantage of the meter is that it can be used not only as a standalone device, but also connected to a PC, where it works with the Peregrine software, so the measured data can also be monitored and logged on a computer.

The power supply is battery-based, with a charging module included, so the unit is fully portable. The whole system is built into a case to make it practical for workshop use as well as portable use.

The goal was not to replace an original Ophir meter, but to build a stable, practical, self-made LPM that can properly handle the Ophir heads I already have. For my hobby use and workshop use, it turned out very well.

Questions and comments are welcome.


PICTURES: Drive
VIDEO: Video

I love this, great job!

beautiful work