Using the Fluke 189's built-in IR serial interface you can send and receive data. I didn't want to spend $60 on a fancy Fluke IR serial cable, so I thought why not make a WiFi interface!

Combine a phototransistor, and IR LED and a cheap (about $3) ESP8266 ESP-01 WiFi module and you can read the meter remotely from any web browser. Technically you can even control parts of the meter!

This was a fun project that I put way too much time into. The goal was to make it as cheaply as possible.

Arduino code provided for the ESP8266. If you have any questions, feel free to ask.

https://youtu.be/k6FPeUcDfpc

Full parts list: toggle switch 10K ohm resistor 470 ohm resistor IR LED photo transistor ESP8266 ESP-01 LM1117-3.3v regulator

Some notes: You might have better results with a smaller resistor than 10K. I think I switched to a 4.7K. The IR components I used are Cylewet CYT1057: https://www.amazon.com/gp/product/B06VY25N8J/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 (I think my receiver is actually a photodiode, not a phototransistor)

You may wish to build an alternate circuit: https://www.eevblog.com/forum/testgear/fluke-187-making-an-ir-cable/ https://www.eevblog.com/forum/testgear/fluke-187-making-an-ir-cable/?action=dlattach;attach=429206;image

20200530 -- updated code to better handle the serial data