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userhead hb9tmc
Replies （9）
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: Unfortunately the readings went back to zero again.
    I'll leave this now and will try to write the firmware if this is possible.
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: Unfortunately the readings went back to zero again.
    I'll leave this now and will try to write the firmware if this is possible.
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: Now that's support, than you :)
    Ok, I already wondered why they have a RX pin. The device is functioning well, as far as I can tell. The laser works, the photodiode works. Just the output is wrong.

    Yes, I have the adapters.

    Thanks,
    Stef

    edit:
    I've resoldered the photodiode because the soldering joints didn't looked too good on a close inspection. Now the values seem pretty normal.
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: Now that's support, than you :)
    Ok, I already wondered why they have a RX pin. The device is functioning well, as far as I can tell. The laser works, the photodiode works. Just the output is wrong.

    Yes, I have the adapters.

    Thanks,
    Stef

    edit:
    I've resoldered the photodiode because the soldering joints didn't looked too good on a close inspection. Now the values seem pretty normal.
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: I just checked the shipping costs; sending it back to HK would cost almost as much as a new one.
    Schematic would be helpful though.
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: I just checked the shipping costs; sending it back to HK would cost almost as much as a new one.
    Schematic would be helpful though.
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: Yes, the sensor was working well. I've included a diagram in the gallery as well as photos from the PCB:
    http://imgur.com/a/sQGTH

    After disassembling and putting it back together (without changing anything) the readings are now higher than zero, but still too low (3-4µg/m³).

    I found some more pictures and experiences here:
    http://aqicn.org/sensor/pms1003/de/
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: Yes, the sensor was working well. I've included a diagram in the gallery as well as photos from the PCB:
    http://imgur.com/a/sQGTH

    After disassembling and putting it back together (without changing anything) the readings are now higher than zero, but still too low (3-4µg/m³).

    I found some more pictures and experiences here:
    http://aqicn.org/sensor/pms1003/de/
  • Topic: pm2.5 sensor SEN0177: concentration shows 0, density is low
    You Reply: Hi,

    I have been running the SEN0177 dust sensor for some days. Today when i started it up, the three concentration data fields (PM1, 2.5 and 10) were 00 00 00, while the density fields are relatively low, example for the 31 bytes after the start byte:

    Code: Select all
    4D 0 1C 0 0 0 0 0 0 0 0 0 0 0 0 0 39 0 13 0 3 0 0 0 0 0 0 51 0 1 4B
    4D 0 1C 0 0 0 0 0 0 0 0 0 0 0 0 0 39 0 13 0 3 0 0 0 0 0 0 51 0 1 4B 
    4D 0 1C 0 0 0 0 0 0 0 0 0 0 0 0 0 39 0 13 0 1 0 0 0 0 0 0 51 0 1 49
    4D 0 1C 0 0 0 0 0 0 0 0 0 0 0 0 0 36 0 12 0 0 0 0 0 0 0 0 51 0 1 44
    4D 0 1C 0 0 0 0 0 0 0 0 0 0 0 0 0 36 0 12 0 0 0 0 0 0 0 0 51 0 1 44


    The checksums are correct, so the sensor is giving wrong values. What can I do about that?
    When I blow into the aperture, sometimes there are concentration readings for some seconds but then they go back to 0 again.

    Do i lose warranty if I open the sensor? There is maybe just something stuck in the refraction chamber.