# FAQ **URL:** https://forum.sensor.community/c/faq/5.md [Latest](https://forum.sensor.community/latest.md) · [Categories](https://forum.sensor.community/categories.md) --- ## [About the FAQ category](https://forum.sensor.community/t/about-the-faq-category/16)
**Author:** [@Lukas](https://forum.sensor.community/u/Lukas)\ **Replies:** 0
Answers in the FAQ sections serve the general interested in the global Sensor.Community sensor network, its individual SensorKits and how to make best use of the generated Open Data. Beside this, feel free to join and be… --- ## [NETTIGO data into influxDB v3](https://forum.sensor.community/t/nettigo-data-into-influxdb-v3/8444)
**Author:** [@mdoubkova](https://forum.sensor.community/u/mdoubkova)\ **Replies:** 0\ **Last updated:** [October 1, 2026, 7:31am UTC](https://forum.sensor.community/t/nettigo-data-into-influxdb-v3/8444 "2026-10-01T07:31:18Z")
Dear all, I thought that this topic may be of interest for many of you who uses Nettigo kits (and potentially also other particulate matter kits). Within AIRCONNECTS project in Austria ( AIRCONNECTS – Armengaud Innovate… --- ## [README: when you see “Your sensor ID is already registered”](https://forum.sensor.community/t/readme-when-you-see-your-sensor-id-is-already-registered/7050)
**Author:** [@metron6](https://forum.sensor.community/u/metron6)\ **Replies:** 15\ **Last updated:** [September 27, 2026, 8:53pm UTC](https://forum.sensor.community/t/readme-when-you-see-your-sensor-id-is-already-registered/7050 "2026-09-27T20:53:30Z")
When you try to register your sensor and see the message: “Your sensor ID is already registered” This means your sensor ID already exists in the database. Common reasons are: You registered it before and deleted it,… --- ## [Export / Download all sensor data](https://forum.sensor.community/t/export-download-all-sensor-data/8436)
**Author:** [@Hans](https://forum.sensor.community/u/Hans)\ **Replies:** 3\ **Last updated:** [September 21, 2026, 10:55am UTC](https://forum.sensor.community/t/export-download-all-sensor-data/8436 "2026-09-21T10:55:23Z")
Hi everyone, I recently moved but wanted to leave a copy and a plot of the air quality of my previous apartment at the Wiki of my previous house. However I cannot figure out how to download the raw data. This is the mad… --- ## [I accidentally deleted my sensor and now I can’t register it again](https://forum.sensor.community/t/i-accidentally-deleted-my-sensor-and-now-i-can-t-register-it-again/8381)
**Author:** [@Damian](https://forum.sensor.community/u/Damian)\ **Replies:** 6\ **Last updated:** [July 29, 2026, 5:55am UTC](https://forum.sensor.community/t/i-accidentally-deleted-my-sensor-and-now-i-can-t-register-it-again/8381 "2026-07-29T05:55:25Z")
Hello, I accidentally deleted my sensor and now I can’t register it again. Could you please release the Sensor ID / ChipID or restore the registration? Sensor ID / ChipID: 6784409 Board: ESP8266 Thank you! --- ## [Deleted Sensor Mistakenly](https://forum.sensor.community/t/deleted-sensor-mistakenly/1432)
**Author:** [@zrrh](https://forum.sensor.community/u/zrrh)\ **Replies:** 98\ **Last updated:** [July 23, 2026, 7:14pm UTC](https://forum.sensor.community/t/deleted-sensor-mistakenly/1432 "2026-07-23T19:14:27Z")
Hi, I deleted my sensor by mistake and I cannot register it again - how can I register it and upload my data? Thanks :slight\_smile: --- ## [Android App no more available?](https://forum.sensor.community/t/android-app-no-more-available/8386)
**Author:** [@CasaviaDiaz](https://forum.sensor.community/u/CasaviaDiaz)\ **Replies:** 5\ **Last updated:** [June 8, 2026, 6:30pm UTC](https://forum.sensor.community/t/android-app-no-more-available/8386 "2026-06-08T18:30:45Z")
Hi everyone, I have a sensor in Trieste on my terrace facing the beautiful Adriatc see ubut too many cruiseships, also. I changed mobile phone and I see the Android app “Luftdaten” is no more available on Google Play. I … --- ## [Register a sensor with a custom firmware](https://forum.sensor.community/t/register-a-sensor-with-a-custom-firmware/8372)
**Author:** [@matteovisotto](https://forum.sensor.community/u/matteovisotto)\ **Replies:** 4\ **Last updated:** [April 11, 2026, 1:55pm UTC](https://forum.sensor.community/t/register-a-sensor-with-a-custom-firmware/8372 "2026-04-11T13:55:47Z")
Hi everyone, I built my custom sensor (AHT20 BMP280 SPS30 BH1750 and ICS43434) with my own custom firmware. I would like to push data to api.sensor.community but I do not now how to register the sensor. How can I regist… --- ## [Release Registered Sensor](https://forum.sensor.community/t/release-registered-sensor/2617)
**Author:** [@mgorfer](https://forum.sensor.community/u/mgorfer)\ **Replies:** 19\ **Last updated:** [April 4, 2026, 9:51am UTC](https://forum.sensor.community/t/release-registered-sensor/2617 "2026-04-04T09:51:41Z")
I have a used sensor from a friend which I would like to register under my account I already emailed contact@sensor.community and posted in Sensor ID is already registered Would it be possible to release esp8266-71788… --- ## [Reregister/Unregister Sensor?](https://forum.sensor.community/t/reregister-unregister-sensor/494)
**Author:** [@nils](https://forum.sensor.community/u/nils)\ **Replies:** 43\ **Last updated:** [March 28, 2026, 5:18pm UTC](https://forum.sensor.community/t/reregister-unregister-sensor/494 "2026-03-28T17:18:57Z")
I took down my old sensor some time ago and want to set it up at a new location. It still seems to be working fine, but i cant register it under a new account and change its geolocation since its already registered (When… --- ## [Where is the Server Data](https://forum.sensor.community/t/where-is-the-server-data/2934)
**Author:** [@Charlie\_Pierce](https://forum.sensor.community/u/Charlie_Pierce)\ **Replies:** 10\ **Last updated:** [March 16, 2026, 6:13am UTC](https://forum.sensor.community/t/where-is-the-server-data/2934 "2026-03-16T06:13:52Z")
It was my understanding that every data point was saved on servers in Germany. The data was accessed by: https://api-rrd.madavi.de/csvfiles.php?sensor=esp8266-1004961 (where 1004961 is the chip identification). It seems … --- ## [This sensor ID is already registered](https://forum.sensor.community/t/this-sensor-id-is-already-registered/2931)
**Author:** [@Franpom](https://forum.sensor.community/u/Franpom)\ **Replies:** 47\ **Last updated:** [February 21, 2026, 7:18pm UTC](https://forum.sensor.community/t/this-sensor-id-is-already-registered/2931 "2026-02-21T19:18:54Z")
Hello I replaced my DTH11 sensor with a BMP280, so I no longer had my temperature and humidity data. So I deleted my sensor to check it but I got a message: My sensor ID: 4296827 controller: ESP8266 Can you help me? … --- ## [Nettigo - SDS011 general air quality index](https://forum.sensor.community/t/nettigo-sds011-general-air-quality-index/8280)
**Author:** [@Kimbo](https://forum.sensor.community/u/Kimbo)\ **Replies:** 0\ **Last updated:** [February 9, 2026, 4:27pm UTC](https://forum.sensor.community/t/nettigo-sds011-general-air-quality-index/8280 "2026-02-09T16:27:28Z")
Installed today the Nettigo Air monitor kit with SDS011 and BME280. Home assistant found this device and I added it. There is an entity which is called “general air quality index” as you see here: For me it is not c… --- ## [Sensor isn't sending data](https://forum.sensor.community/t/sensor-isnt-sending-data/8264)
**Author:** [@sabrina](https://forum.sensor.community/u/sabrina)\ **Replies:** 4\ **Last updated:** [February 1, 2026, 2:08pm UTC](https://forum.sensor.community/t/sensor-isnt-sending-data/8264 "2026-02-01T14:08:54Z")
Hello, I’ve tried to reinstall my sensor (after quite some time). I can see it is connected to my wifi but I see no data on grafana website (PM sensors - Dashboards - Grafana). What could I’ve done wrong ? Thanks for y… --- ## [Sds011 vs. sps30](https://forum.sensor.community/t/sds011-vs-sps30/8243)
**Author:** [@luftikus](https://forum.sensor.community/u/luftikus)\ **Replies:** 2\ **Last updated:** [December 19, 2025, 9:50am UTC](https://forum.sensor.community/t/sds011-vs-sps30/8243 "2025-12-19T09:50:01Z")
Welcher Feinstaubsensor ist mehr empfehlenswert? Wie gut sind die Daten vom sds011? Die Behörden zweifeln die Messungen an. Ich habe den sds011 verbaut. --- ## [Sensor not on Map](https://forum.sensor.community/t/sensor-not-on-map/8242)
**Author:** [@MarioB](https://forum.sensor.community/u/MarioB)\ **Replies:** 1\ **Last updated:** [December 17, 2025, 1:45pm UTC](https://forum.sensor.community/t/sensor-not-on-map/8242 "2025-12-17T13:45:14Z")
Hello, I can’t see my sensor on map but on Grafana is it OK. ID: esp8266-4273455 thanks for help Mario --- ## [Connecting new Rasp Pi/Enviro+ to Sensor Community](https://forum.sensor.community/t/connecting-new-rasp-pi-enviro-to-sensor-community/1377)
**Author:** [@GoudieBerry](https://forum.sensor.community/u/GoudieBerry)\ **Replies:** 7\ **Last updated:** [December 7, 2025, 2:31am UTC](https://forum.sensor.community/t/connecting-new-rasp-pi-enviro-to-sensor-community/1377 "2025-12-07T02:31:50Z")
All, I’m a newbie but I’ve gone through the normal simple explanations for errors and I can’t find out what’s wrong. I’ve successfully loaded the appropriate scripts onto the Pi and I’m getting output onto my MacBook T… --- ## [Pas de sensor sur la carte](https://forum.sensor.community/t/pas-de-sensor-sur-la-carte/8218)
**Author:** [@Marcel\_Pilloud](https://forum.sensor.community/u/Marcel_Pilloud)\ **Replies:** 3\ **Last updated:** [November 30, 2025, 10:50am UTC](https://forum.sensor.community/t/pas-de-sensor-sur-la-carte/8218 "2025-11-30T10:50:37Z")
Bonjour, mon appareil n’apparaît pas sur la carte ? No.11118674 Merci ! --- ## [Device already registered (NebuleAir)](https://forum.sensor.community/t/device-already-registered-nebuleair/8184)
**Author:** [@TytouLamadou](https://forum.sensor.community/u/TytouLamadou)\ **Replies:** 9\ **Last updated:** [November 19, 2025, 6:56am UTC](https://forum.sensor.community/t/device-already-registered-nebuleair/8184 "2025-11-19T06:56:08Z")
Hi, I’ve just installed a NebuleAir device which has a BME280 and Tera Sensor Next PM. I try to register it but got the ‘Device already registered’ error. its ID is: 10FECA1815AC Could you please support me? With kin… --- ## [Can't connect with my new sensor](https://forum.sensor.community/t/cant-connect-with-my-new-sensor/8180)
**Author:** [@Walter82](https://forum.sensor.community/u/Walter82)\ **Replies:** 1\ **Last updated:** [November 17, 2025, 2:50pm UTC](https://forum.sensor.community/t/cant-connect-with-my-new-sensor/8180 "2025-11-17T14:50:50Z")
Hello, i’am new en I got my first 2.5 sensor. I have read the installation page and follow the steps but I can’t get the sensor running online. I have also the problem that mij sensor id already is registered. I delete… --- ## [No WIFI signal after restart](https://forum.sensor.community/t/no-wifi-signal-after-restart/7009)
**Author:** [@hohemazb](https://forum.sensor.community/u/hohemazb)\ **Replies:** 19\ **Last updated:** [September 24, 2025, 4:09pm UTC](https://forum.sensor.community/t/no-wifi-signal-after-restart/7009 "2025-09-24T16:09:53Z")
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 po… --- ## [How to set a timezone?](https://forum.sensor.community/t/how-to-set-a-timezone/7091)
**Author:** [@Olli](https://forum.sensor.community/u/Olli)\ **Replies:** 5\ **Last updated:** [September 23, 2025, 8:30pm UTC](https://forum.sensor.community/t/how-to-set-a-timezone/7091 "2025-09-23T20:30:19Z")
Hello, My Sensor collects the time from 176.9.44.212 (0.pool.ntp.org), and this time is 2 hrs behind our time… Is there a way to correct this? Thx for help! --- ## [My sensor isn´t online anymore](https://forum.sensor.community/t/my-sensor-isn-t-online-anymore/7078)
**Author:** [@MCogliati](https://forum.sensor.community/u/MCogliati)\ **Replies:** 2\ **Last updated:** [September 8, 2025, 8:21pm UTC](https://forum.sensor.community/t/my-sensor-isn-t-online-anymore/7078 "2025-09-08T20:21:14Z")
My sensor hasn’t been visible on the network for a day. Any idea why? It seems to be working correctly. ID: 2925659 (c4d8d52ca45b). --- ## [Certificate expired](https://forum.sensor.community/t/certificate-expired/7027)
**Author:** [@ursmii](https://forum.sensor.community/u/ursmii)\ **Replies:** 12\ **Last updated:** [August 29, 2025, 12:44pm UTC](https://forum.sensor.community/t/certificate-expired/7027 "2025-08-29T12:44:09Z")
Websites prove their identity via certificates, which are valid for a set time period. The certificate for api-rrd.madavi.de:3000 expired on 19.08.2025. Error code: SEC\_ERROR\_EXPIRED\_CERTIFICATE --- ## [Question about solar power the sensor and 4G/LTE communication](https://forum.sensor.community/t/question-about-solar-power-the-sensor-and-4g-lte-communication/1773)
**Author:** [@Frens](https://forum.sensor.community/u/Frens)\ **Replies:** 9\ **Last updated:** [August 19, 2025, 8:19am UTC](https://forum.sensor.community/t/question-about-solar-power-the-sensor-and-4g-lte-communication/1773 "2025-08-19T08:19:51Z")
Hello forum members. I am new here and love what you all are accomplishing. I have electrical / electronics background and in my spare time I am working on a food forest . Now I want to put 2 air quality and sound sen… --- ## [Kein W-LAN-Signal nach Neustart](https://forum.sensor.community/t/kein-w-lan-signal-nach-neustart/7005)
**Author:** [@hohemazb](https://forum.sensor.community/u/hohemazb)\ **Replies:** 0\ **Last updated:** [August 6, 2025, 7:39pm UTC](https://forum.sensor.community/t/kein-w-lan-signal-nach-neustart/7005 "2025-08-06T19:39:23Z")
Ich habe seit 5 Jahren einen Feinstaubsensor in Betrieb und das funktionierte auch gut (bis auf gelegentliche Unterbrechungen der Stromversorgung). Nun bin ich umgezogen und möchte das System am neuen Standort wieder in… --- ## [Trying to register a new SDS011 sensor but it is already registered](https://forum.sensor.community/t/trying-to-register-a-new-sds011-sensor-but-it-is-already-registered/4271)
**Author:** [@kras](https://forum.sensor.community/u/kras)\ **Replies:** 20\ **Last updated:** [July 29, 2025, 10:50am UTC](https://forum.sensor.community/t/trying-to-register-a-new-sds011-sensor-but-it-is-already-registered/4271 "2025-07-29T10:50:36Z")
Hello I am trying to register a new sensor as far as I understand I get the sensor this way: Then I tried with this recommendation by GPT: response = b'\\xaa\\xc0\\x86\\x01\\x16\\x03\\x71\\x77\\x88\\xab' # Extract the device… --- ## [Can´t register my Sensor](https://forum.sensor.community/t/can-t-register-my-sensor/6956)
**Author:** [@bader357](https://forum.sensor.community/u/bader357)\ **Replies:** 2\ **Last updated:** [July 5, 2025, 6:15am UTC](https://forum.sensor.community/t/can-t-register-my-sensor/6956 "2025-07-05T06:15:29Z")
Hi Rick My problem, I can´t register my sensor. Can you re-register it please. ID: 9629323 MCU: 8266 Thank you --- ## [Mass Flowmeter VS Oval Gear Flowmeter, which one is better for monitoring palm oil](https://forum.sensor.community/t/mass-flowmeter-vs-oval-gear-flowmeter-which-one-is-better-for-monitoring-palm-oil/6942)
**Author:** [@Holykell](https://forum.sensor.community/u/Holykell)\ **Replies:** 0\ **Last updated:** [June 27, 2025, 1:59am UTC](https://forum.sensor.community/t/mass-flowmeter-vs-oval-gear-flowmeter-which-one-is-better-for-monitoring-palm-oil/6942 "2025-06-27T01:59:23Z")
In the palm oil industry, accurate flow measurement plays a critical role in production control, trade settlement, and quality assurance. Among so many types of flow meters, mass Coriolis flow meters and oval gear flow m… --- ## [Sensor already registered#01](https://forum.sensor.community/t/sensor-already-registered-01/3115)
**Author:** [@Egomnet](https://forum.sensor.community/u/Egomnet)\ **Replies:** 1\ **Last updated:** [June 16, 2025, 7:06am UTC](https://forum.sensor.community/t/sensor-already-registered-01/3115 "2025-06-16T07:06:39Z")
Hello, I missconfigured my sensor added the wrong sensor type, so i deleted it from my acount so i can re-add it. After searchin trough the forums i figured it just deletes it from my account the sensor is still register… [Next page](https://forum.sensor.community/c/faq/5.md?page=1)