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en:tech:ut71 [2022/11/30 11:49] – [Downloads] bullaren:tech:ut71 [2026/08/12 12:15] (current) – external edit 127.0.0.1
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 The digital multimeter series UT71 from [[http://www.uni-trend.com/en/|Uni-Trend]] The digital multimeter series UT71 from [[http://www.uni-trend.com/en/|Uni-Trend]]
  
-{{:tech:ut71b.png?nolink&200 |}} +{{:media:tech:ut71: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 €.  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 ^ ^ Qty ^ Part ^ Cost ^
-| 1 | PL2303HX or similar  {{:tech:pl2303hx.jpg?nolink&50 |}} | 3.00 € | +| 1 | PL2303HX or similar  {{:media:tech:ut71:pl2303hx.jpg?nolink&50 |}} | 3.00 € | 
-| 1 | IR-Fototransistor {{:tech:fototransistor.jpg?nolink&50 |}} | 0.10 € | +| 1 | IR-Fototransistor {{:media:tech:ut71:fototransistor.jpg?nolink&50 |}} | 0.10 € | 
-| 1 | IR-LED {{:tech:ir_led.jpg?nolink&50 |}} | 0.10 € | +| 1 | IR-LED {{:media:tech:ut71:ir_led.jpg?nolink&50 |}} | 0.10 € | 
-| 1 | 4k7 {{:tech:r_0805.jpg?nolink&50 |}} | 0.10 € | +| 1 | 4k7 {{:media:tech:ut71:r_0805.jpg?nolink&50 |}} | 0.10 € | 
-| 1 | 1K0 {{:tech:r_0805.jpg?nolink&50 |}} | 0.10 € | +| 1 | 1K0 {{:media:tech:ut71:r_0805.jpg?nolink&50 |}} | 0.10 € | 
-| 1 | PCB (very small piece) {{:tech:lochraster.jpg?nolink&50 |}} | 0.50 € | +| 1 | PCB (very small piece) {{:media:tech:3d_huxley:lochraster.jpg?nolink&50 |}} | 0.50 € | 
-| 1 | Housing (3D print or laser cut) {{:tech:housing.png?nolink&50 |}} | 0.50 € |+| 1 | Housing (3D print or laser cut) {{:media:tech:ut71:housing.png?nolink&50 |}} | 0.50 € |
  
 ===== Schematic ===== ===== Schematic =====
  
-{{:tech:ut71_if_schematic.png?200 |}}+{{:media:tech:ut71: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 USB to Serial converter PL2303HX provides 4 wires for the signals GND, +5V, RxD and TxD as shown in the schematic
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 ===== Housing ===== ===== Housing =====
  
-{{:tech:housing.png?nolink&200 |}}+{{:media:tech:ut71:housing.png?nolink&200 |}}
 I used a laser cut housing based on 2mm white acryl. The design was prepared with Inkscape.  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. Depending on the thickness of your wiring you may not need all layers. In my example I only used 4 pieces.
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 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.    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 |}} +{{:media:tech:ut71:img_0030.jpg?direct&400 |}} 
-{{:tech:img_0553.jpg?direct&200|}} {{:tech:img_0552.jpg?direct&200|}}+{{:media:tech:ut71:img_0553.jpg?direct&200|}} {{:media:tech:ut71:img_0552.jpg?direct&200|}}
  
  
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 The logic analyser revealed the following signal frame: The logic analyser revealed the following signal frame:
  
-{{ :tech:ut71ab_frame.png?direct&600 |UT71 frame}}+{{ :media:tech:ut71:ut71ab_frame.png?direct&600 |UT71 frame}}
  
 As we can see the multimeter sends 11 Bytes with 2400 Baud, 7 bits and ODD parity in ASCII format every approx. 650ms. With our built hardware we are now able to use a standard UART-program to analyse the protocol further. After some long iterations (and a lot of coffees) the eleven bytes have following meaning:  As we can see the multimeter sends 11 Bytes with 2400 Baud, 7 bits and ODD parity in ASCII format every approx. 650ms. With our built hardware we are now able to use a standard UART-program to analyse the protocol further. After some long iterations (and a lot of coffees) the eleven bytes have following meaning: 
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 <WRAP group> <WRAP group>
 <WRAP half column> <WRAP half column>
-{{ :tech:ut71_app.png?direct&300|UT71 App}}+{{ :media:tech:ut71:ut71_app.png?direct&300|UT71 App}}
 </WRAP> </WRAP>
 <WRAP half column> <WRAP half column>
-{{:tech:ut71_app_table.png?direct&250 |record table}}+{{:media:tech:ut71:ut71_app_table.png?direct&250 |record table}}
 </WRAP> </WRAP>
 </WRAP> </WRAP>
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 ===== Downloads ===== ===== Downloads =====
  
-  * {{:tech:ir_usb_adapter.svg.zip|Housing (SVG file)}}  +  * {{:media:tech:3d_huxley:ir_usb_adapter.svg.zip|Housing (SVG file)}}  
-  * {{ :tech:ut71_app.zip| UT71 Measurement Tool (.py)}}+  * {{ :media:tech:ut71:ut71_app.zip| UT71 Measurement Tool (.py)}}
 ===== Donate ===== ===== Donate =====
  
en/tech/ut71.1669808942.txt.gz · Last modified: by bullar

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