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Electronics => Projects, Designs, and Technical Stuff => Topic started by: mrjoda on June 06, 2016, 08:16:03 pm

Title: Fluke 187 IR cable
Post by: mrjoda on June 06, 2016, 08:16:03 pm

Hi friends

I bought F187 for a few bucks so... here is my DIY fluke IR USB cable attachment.

Circuit is basic connection of FTDI FT232RL with one LM393 at output/input. Powered from USB. I saw this schematic somewhere on internet but i dont have link.

PCB is little bit fancy. It has 13,7x23,20mm double sided.

The body of connector is 3D printed from PLA.

gerbers and steps are included down.

i works with flukeview form with no issues.

Title: Re: Fluke 187 IR cable
Post by: BravoV on June 07, 2016, 02:26:38 am

Nice  :-+, thanks for sharing, I like the idea of the 3D printed connector body.  :clap:

Title: Fluke 187 IR cable
Post by: serggio on June 10, 2016, 06:47:57 pm

Disaster...
Seems that people absolutely not understand schematic and just try to do copy-past solution where comparator was used for drive emitting diode and convert photodiode level. http://kimboricha.blogspot.ru/2013/12/build-usb-to-fluke-189-irinfrared.html (http://kimboricha.blogspot.ru/2013/12/build-usb-to-fluke-189-irinfrared.html)
Now carefully look at your schematic where you use 10k/10k R1/R3 divider. What reverence voltage you will have on inverted input on comparator? I assume that this will be 5/2 = 2,5 V
And what role LM393 here in your schematic, when you can easy exclude it and connect your emitting and receiving diodes directly to Rx and Tx line?  :clap:

Title: Re: Fluke 187 IR cable
Post by: michal82 on June 17, 2017, 08:51:31 pm

Hello
At what wavelength did you use the transmitter and receiver.
800nm, 880nm or 950nm?

Title: Re: Fluke 187 IR cable
Post by: serggio on June 17, 2017, 09:09:57 pm

950 will work, 880 will work, don't worry about it