# SDS011 refuses to work with latest firmware NRZ-2024-135

**URL:** https://forum.sensor.community/t/sds011-refuses-to-work-with-latest-firmware-nrz-2024-135/7017
**Category:** Scientific Discourse
**Created:** [August 13, 2025, 10:04am UTC](https://forum.sensor.community/t/sds011-refuses-to-work-with-latest-firmware-nrz-2024-135/7017 "2025-08-13T10:04:41Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![kmm59](https://forum.sensor.community/letter_avatar_proxy/v4/letter/k/5f8ce5/32.png) [@kmm59](https://forum.sensor.community/u/kmm59)
#### Post date: [August 13, 2025, 10:04am UTC](https://forum.sensor.community/t/sds011-refuses-to-work-with-latest-firmware-nrz-2024-135/7017/1 "2025-08-13T10:04:41Z")

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Hi team, my sds011 sensor has worked for some weeks in the past but currently it does not work anymore with firmware NRZ-2024-135. I have checked to flash the esp-8266 with the SDS011 example SW from the Arduino IDE and with this SW the sensor works like a charm.  
Back to the “airrohr” SW the sensor refuses to work (no data available in the device sensor status view). The BME280 instead works correctly.  
Here is the output of the debug info (minicom):

airRohr: NRZ-2024-135/DE  
mounting FS…  
opened config file…  
parsing json: Ok  
No Next PM… serialSDS 9600 8N1  
output debug text to displays…  
Connecting to Myxxx  
…SNTP synced: Wed Aug 13 09:47:06 2025

twoStageOTAUpdate  
output debug text to displays…  
.  
WiFi connected, IP is: 192.168.178.48  
Starting Webserver… 192.168.178.48

ChipId: 3437487

## MAC Id: a020a63473af

Read SDS…:  
Stopping SDS011…  
Read BMx280…  
Trying BMx280 sensor on 77 … not found  
Trying BMx280 sensor on 76 … found  
Send to :  
sensor.community

> **[Madavi](https://www.madavi.de/)**

Auto-Update active…  
Temperature (°C): 25.15  
Pressure (hPa): 98820.84  
Humidity (%): 49.21

Any idea what to check or to do ?

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<div class="post-metadata">

### Author: ![ricki-z](https://forum.sensor.community/user_avatar/forum.sensor.community/ricki-z/32/215_2.png) [@ricki-z](https://forum.sensor.community/u/ricki-z)
#### Post date: [August 14, 2025, 10:47pm UTC](https://forum.sensor.community/t/sds011-refuses-to-work-with-latest-firmware-nrz-2024-135/7017/2 "2025-08-14T22:47:02Z")

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Please check the GPIO pins connected to the SDS011.  
Most examples use different pins than our firmware. The schematics can be found in our build instructions.