I had operated a particulate matter sensor (SDS011+ BME280) for 5 years and it worked well.
Now I moved to a different flat in the same city and want to put it into operation again at the new site. Connected with the power supply, the fan runs periodically and the blue LED is on. However, I get no WIFI signal, even after waiting for a longer time. I flashed the firmware (Windows 10: https://firmware.sensor.community/airrohr/flashing-tool/airRohr-firmware-flasher-0.3.2-Windows_amd64.exe ) but still no WIFI. What could I do?
Thanks for any helpful clue.
If the fan runs periodically, it means new WiFi is well set up.
Have you updated the adress in devices.sensor.community ?
Has the Wifi the Same credentials as before ?
If not the sensor’s own WiFi should appear for 5 minutes.
I don’t receive any WIFI signal although the device is placed close to my WIFI router.
I’m not sure what you mean with not receiving any WIFI signal but I’ll assume that it means that the sensor won’t connect to your local Wifi-network.
If, after a restart or powerup the device can’t connect to a previously or not yet configured Wifi-network it will switch to AP mode. If that happens you should see a Wifi-network called airrohr-6229057 or similar for 10 minutes. During those 10 minutes you can connect to the airrohr-6229057 network (when asked for a password use airrohrcfg). You should then be able to (re)configure the sensor including the connection to the available Wifi-networks on your location. See also the instructions at Sensor Community
Note that after the 10 minutes AP-mode the sensor will go to ‘client’-mode again and will start doing the periodic measurements, even if it can’t connect to the configured Wifi-network. So even without working Wifi the fan will run every 145 seconds and the sensor will try but fail to upload data (blue led flashing).
I expected to see a WIFI signal such as airrohr-xxxxxxx but that did not happen. Not within a 10 min period of time after startup nor later.
I suspect a defect of the WIFI unit. Therefore, I ordered a new ESP8266. Perhaps this will help.
Perhaps you already did that but you could also try to flash the firmware again with the option Erase flash.