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[Question] How to derive the probe in a cheap temperature sensor from ali

zzzsakul 894 9
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 20948680
    zzzsakul
    Level 7  
    Hi, once on the Internet flashed me the topic of deriving a probe from a cheap temperature and humidity sensor available on Ali for about 10 zł.
    Unfortunately, I can no longer find this post.
    The only thing left is a screen in the phone and the opinion of the user (in memory) that, however, can be done.
    I am looking for more information on this topic.
    Maybe someone could tell me more on this topic.
    First picture is a screen from the forum, the second is a sample sensor. Temperature and humidity sensor with cord Disassembled temperature and humidity sensor with interior visible. .
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  • #2 20948703
    Mastertech
    Level 27  
    You have to physically locate that sensor on the board first because the new ones are very small and I don't know if you'll have the skill to move it.
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  • #3 20948776
    zzzsakul
    Level 7  

    A must try. Could you help me with the location of this place? Because I can't see anything there
  • #4 20949246
    Mastertech
    Level 27  
    Read the code designation of component Q1, this could be a 3-pin temperature sensor.
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  • #5 20949308
    p.kaczmarek2
    Moderator Smart Home  
    Rather Q1 is not the sensor, I would bet on U2, according to this topic:
    https://www.elektroda.com/rtvforum/topic3945688.html
    Maybe it's SHT30, but I would ask for a clear photo of the sensor and to read its markings.
    Helpful post? Buy me a coffee.
  • #6 20949346
    viayner
    Level 43  
    Hi,
    The holes in the case will be helpful in locating it, they should be opposite the humidity sensor.
    The problem may be that this sensor may communicate "digitally", e.g. I2C, then "bringing it out in a working circuit will not be possible. If the response is analogue, then you can try to include the load.
    Greetings
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  • #7 20949367
    mipix
    Level 38  
    SHT30 has 2 more legs, the one in the picture has 6 pins and it will rather be CHT8305 Source information Electronic board with components and markings, including a module labeled ZTU. A circuit board with electronic components, labels, and a CHT8305 sensor.
    zzzsakul wrote:
    The first image is a screen capture from the forum, the second is a sample sensor
    These thermometers from Aliexpress, despite having a similar casing, have different boards and different sensors inside. You may find that you have a different one. Take it apart and show it.
    Removing the sensor will require precision soldering and maybe some SMD adapter in the form of a laminate so that the circuit doesn't hang on the wires.
    Attachments:
  • #8 20950116
    zzzsakul
    Level 7  

    I am uploading better quality photos.
    Close-up of an electronic circuit on a wooden background. Close-up of a blue circuit board with electronic components. Close-up of a disassembled digital thermometer with an electronic circuit on a blue PCB board. Close-up of a circuit board with visible electronic components and model number ZTU. Close-up of a circuit board with visible electronic components and markings. Close-up of a printed circuit board with visible electronic components. Close-up image of a circuit board with electronic components. Close-up image of a circuit board with electronic components.
  • #9 20950152
    Mastertech
    Level 27  
    Agree with what colleague @mipix wrote
    Also, the type of sensor does not matter because it is just a matter of moving it.
    6 feet is no mean feat, the question is at what distance you want to move it,
    because even at 30cm problems may arise.
  • #10 20950157
    zzzsakul
    Level 7  

    It is sufficient for the probe to be brought out to a few cm. Even 5 cm will be a sufficient distance.
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Topic summary

The discussion revolves around extracting a probe from a low-cost temperature and humidity sensor purchased from AliExpress. Participants emphasize the importance of identifying the correct sensor on the circuit board, with suggestions to locate components like Q1 and U2, which may correspond to temperature sensors such as SHT30 or CHT8305. The challenges of soldering and maintaining signal integrity over distances are highlighted, with recommendations for careful handling and potential use of SMD adapters. Users are encouraged to provide clear images of the sensor for better identification and assistance.
Summary generated by the language model.
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