### Author:  [@Pink](https://forum.sensor.community/u/Pink)
#### Post date: [March 6, 2023, 6:31pm UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/1 "2023-03-06T18:31:45Z")
Hello. I am trying to set up an Air Quality Monitoring System with an NodeEMCU v3 - esp8266, an BME280 and a Sensirion SPS30.
I flashed the firmware 0.3.2 with the airRohr-Flashing Tool onto the Node and connectet it with my WiFi. After that i connected the BME280 like it is shown in the instructions from the sensor.community webpage.
I also connected the Sensirion SPS30 with the help of a JST ZH connector from “berrybase” like the way the SDS011 is connected, but i didn’t connect the Pin 4 “SEL” from the SPS30 sensor. My Powersupply is the official Rasperry Pi Poweradapter.
After plugging in the system i can see the BME280 is working fine, but i don’t get any data from the SPS30. In the errorbox in the software it shows:
“WiFi\_0/-66/0”
“OTA Return\_200”
“Sensirion SPS30\_0”
I didn’t find any solution in the forum. Could someone help me with my problem? Maybe I connected something wrong? Unfortunately I don’t know what to do with the error “0”.
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [March 7, 2023, 8:02am UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/2 "2023-03-07T08:02:47Z")
SPS30 is I2C not UART.
Please check here:
>
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### Author:  [@fredvduin](https://forum.sensor.community/u/fredvduin)
#### Post date: [March 7, 2023, 8:28am UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/3 "2023-03-07T08:28:08Z")
I use IIC and connect Pin4 to GND
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### Author:  [@Pink](https://forum.sensor.community/u/Pink)
#### Post date: [March 7, 2023, 10:21am UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/4 "2023-03-07T10:21:18Z")
Many many thanks! Now I get values from the SPS30 sensor. I guess I still need to connect the BME280 via pins D3 and D4 as well, as instructed, or is there a way without soldering the wires together?
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### Author:  [@pjg](https://forum.sensor.community/u/pjg)
#### Post date: [March 7, 2023, 1:53pm UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/5 "2023-03-07T13:53:01Z")
There is no way. You have to solder or imagine a system with further pins on a small board.
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### Author:  [@fredvduin](https://forum.sensor.community/u/fredvduin)
#### Post date: [March 7, 2023, 2:54pm UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/6 "2023-03-07T14:54:15Z")
Agree, best is solder, for temporary or when I can not solder, I use sometimes “Heat Shrink Butt Crimp/Ali”
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### Author:  [@Pink](https://forum.sensor.community/u/Pink)
#### Post date: [March 13, 2023, 9:35am UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/7 "2023-03-13T09:35:04Z")
Ok, then I’ll solder it together, it just has to work and doesn’t have to win a beauty contest. Thank you very much for the quick help!
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### Author:  [@Olli](https://forum.sensor.community/u/Olli)
#### Post date: [October 19, 2025, 1:36pm UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/8 "2025-10-19T13:36:45Z")
are the two sensors connected paralelly?
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### Author:  [@fredvduin](https://forum.sensor.community/u/fredvduin)
#### Post date: [October 22, 2025, 8:46am UTC](https://forum.sensor.community/t/sps30-does-not-work/1913/9 "2025-10-22T08:46:15Z")
Yes, both sensors are IIC