Arduino Mount for HP 3435A Digital Multimeter

An Arduino UNO mount for an HP 3435A DMM to enable serial logging/output as a poor man's scope over Excel DataStreamer. See this GitHub repo for more information on how this works electronically. Essentially the goal with this project is to be able to log data off this meter by reading what it is outputting to the display over serial.

For the 3D printed parts, you need three M3 threaded inserts for the Arduino UNO and corresponding screws and print all parts in PLA, exact settings don't matter much. The extra washers & caps are used to hold the charging/power distribution board if you have the variant with the lead acid battery as we opted to remove and safely dispose of our battery & mount to reduce weight (and to prevent any leaks as the battery was dead over all that time and we didn't want to replace it). If you opt to do the same, you will need those parts, but otherwise just the Arduino mount is needed (though you may have to see if the battery interferes with the mounting position at all.

You will need to make a cutout in the side of the multimeter housing with a rotary tool to prepare it for the Arduino mount and then you can solder the pins on the UNO to the corresponding pins on the main processing/driver IC (see GitHub for info on this). Once wired up, make sure the Arduino is powered/grounded even when the logging function isn't used as otherwise the display will not work properly and some segments won't light up (I assume the Arduino added into the circuit might create a floating ground issue or something).

This model was created using Autodesk Inventor.