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===== UT71B Interface =====

The digital multimeter series UT71 from [[http://www.uni-trend.com/en/|Uni-Trend]]

{{:tech:ut71b.png?nolink&200 |}} 

provides a cheap measurement solution with reasonable accuracy. The set includes an USB Interface Cable and a Windows based software. Unfortunately the USB Interface doesn't work with Mac OS X. But the optical interface can be easily soldered for less than 5.00 €. 

^ Qty ^ Part ^ Cost ^
|1| PL2303HX or similar {{ :tech:pl2303hx.jpg?nolink&50|}}| 3.00 € |
|1| IR-Fototransistor {{:tech:fototransistor.jpg?nolink&50|}}| 0.10 € |
|1| IR-LED {{:tech:ir_led.jpg?nolink&50|}} | 0.10 € |
|1| 4k7 {{:tech:r_0805.jpg?nolink&50|}}| 0.10 € |
|1| 1K0 {{:tech:r_0805.jpg?nolink&50|}}| 0.10 € |
|1| PCB (very small piece) {{:tech:lochraster.jpg?nolink&50|}}| 0.50 € |
|1| Housing (3D print or laser cut) {{:tech:housing.png?nolink&50|}} | 0.50 € |

==== Schematic ====

{{:tech:ut71_if_schematic.png?200 |}}

The USB to Serial converter PL2303HX provides 4 wires for the signals GND, +5V, RxD and TxD as shown in the schematic
The TxD diode is optional and not supported by the software (yet). 

==== Housing ====

{{:tech:housing.png?nolink&200 |}}
I used a laser cut housing based on 2mm white acryl. The design was prepared with Inkscape. 
Depending on the thickness of your wiring you may not need all layers. In my example I only used 4 pieces.
{{:tech:ir_usb_adapter.svg.zip|SVG file}} 


==== Assembly ====

Cut and engrave on your laser cutter of choice. Prepare the small piece of PCB (perfboard). Glue the IR transistor (dark blue)and the IR LED. The flat part should be on the left for each. Solder the parts and the SMD resistors as shown on the picture. Last but not least connect the four wire of the PL2303HX.   

{{:tech:img_0030.jpg?direct&400 |}}
{{:tech:img_0553.jpg?direct&200|}} {{:tech:img_0552.jpg?direct&200|}}
==== Software ====
{{ :tech:sw_main_window.png?direct&200 |}}

The S/W is written with [[https://www.xojo.com|XOJO]] to support all major OS (Windows, OS X, Linux).
As I have just now only a license for OS X I can't provide binaries for Windows and Linux.

The S/W has mainly the same functionality as the original one.

^ Version ^ Remark ^ OS ^ File ^
| V0.10 | Initial Version | Mac OS X 10.9+ | {{:tech:ut71ab_ifp_v010.zip|}} |

==== Donate ====

If you like the software feel free to donate :-)

<html>
  <form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
  <input type="hidden" name="cmd" value="_s-xclick">
  <input type="hidden" name="hosted_button_id" value="SWLDEN27V3VPL">
  <input type="image" src="https://www.paypalobjects.com/de_DE/DE/i/btn/btn_donateCC_LG.gif" border="0" name="submit"  alt="Jetzt einfach, schnell und sicher online bezahlen – mit PayPal.">
  <img alt="" border="0" src="https://www.paypalobjects.com/de_DE/i/scr/pixel.gif" width="1" height="1">
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