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SKU: WMMI211 This product is a replacement of: VM211,VM211SE Check our full Whadda product transition list Category: Skills: , ,
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14-day unmodified return policy


Ever wondered how good the air quality is in your living room? Or do you need proof of why you fall asleep in a non-ventilated meeting room after 3 hours? Look no further! This DIY experimental kit has all the answers!

The Earth Listener is an Arduino based sensor device that reads multiple environmental values to indicate the air quality. This kit is assembled in 15 minutes and you don’t need a soldering iron! Just connect the parts and wires, put everything in the case and connect it to a 5V USB socket. The Mega development board is pre-programmed and shows eCO2, TVOC (particles in the air), barometric pressure, temperature and humidity values onto the TFT touchscreen. To top thing off, the Earth Listener also contains a lightning detection sensor. If lightning (or electronic discharge) is detected, the Earth Listener will give an alarm tone and log how far the lightning is located. Since everything is open source, you can add an additional 6 sensors to the Earth Listener via the sensor shield. Logging is possible via the micro SD card (not included).

*Arduino compatible 3 colour RGB SMD LED module not included:

This product is a replacement of: VM211,VM211SE


  • Easy assembly and operation: The Earth Listener is assembled in just 15 minutes and requires no soldering. This makes it an excellent option for both electronics beginners and experienced hobbyists.
  • Comprehensive environmental monitoring : The Earth Listener measures essential environmental values such as eCO², TVOC, air pressure, temperature, and humidity. Gathering this information is crucial for an in-depth understanding of air quality in a space, contributing to a healthier living or working environment.
  • Lightning detection: When the sensor detects lightning or electrical discharges (up to a distance of 40 km), an alert signal is activated.
  • Data recording and storage: All data can be stored on an SD card (not included). This can be particularly useful for monitoring changes in air quality over a specific period or evaluating the effectiveness of measures aimed at improving air quality.
  • Made in Belgium: Whadda is a unique brand of the Belgian Velleman Group that offers DIY projects for hobbyists or makers interested in diving into electronics, programming, and mechanics.
  • RGB SMD LED module with 5050 chip for Arduino projects (5410329729905)
  • For stable eCO² and TVOC measurements, the Earth Listener requires an initial run-in period of 48 hours and at least 20 minutes of recording.
  • This experimentation kit is designed exclusively for indicative purposes. The interpretation of collected data should take into account the specific conditions of the environment. Proper ventilation of your living space is essential.


  • Product basic info:
    • Instruction manual languages: English
    • Primary colours: Brown
    • Primary detailed colours: Wood
    • Depth unit: 13.5 cm
    • Height unit: 8.4 cm
    • Width unit: 4.1 cm
    • Weight unit: 215 g
  • Technical data:
    • Specifications kits & modules: <ul> <li>measures eCO2, TVOC, barometric pressure, temperature and humidity</li> <li>detects lightning or electronic discharge</li> <li>2.8-inch color touch screen</li> <li>logging function on SD card (SD not included)</li> <li>hardware with pre-programmed software for a plug-and-play, ready-to-use experience</li> <li>open source and fully Arduino based, easy to expand and modify</li> <li>stylish wooden enclosure or special edition see-through plexi case (VM211SE)</li> <ul></ul></ul>
    • Specifications extra kits & modules: <ul> <li>development board: <ul> <li>microcontroller: ATmega2560</li> <li>operating voltage: 5 VDC (USB) – power supply not included, 2m USB cable included</li> <li>free pins after build: 30 digital / 5 analog</li> </ul> </li> <li>touch screen:<br> <ul> <li>TFT resolution: 320 x 240</li> <li>TFT colour depth: 262 000 colour</li> </ul></li></ul>
    • Specifications extra extra kits & modules: <ul> <li>CCS811 sensor: <ul> <li>TVOC sensing 0 to 1,187 ppb</li> <li>eCO2 sensing from 400 to 8,192 ppm</li> <li>I2C compatible interface</li> </ul> </li> <li>BME280 sensor: <ul> <li>temperature: -40°C to 85°C</li> <li>humidity: 0-100% RH, =-3% from 20-80%</li> <li>pressure: 30,000 Pa to 110,000 Pa, relative accuracy of 12 Pa, absolute accuracy of 100 Pa</li> <li>altitude: 0 to 9.2 km (30.000 feet), relative accuracy of 1 m (3.3 feet) at sea level, 2 m (6.6) at 9,2 km (30.000 feet)</li> </ul> </li> <li>enclosure:&nbsp; <ul> <li>laser cut wood</li> <li>plexi enclosure (VM211SE)</li> </ul> </li> <li>AS3935 sensor: <ul> <li>distance estimation to the head of the storm in 15 steps</li> <li>detects both cloud-to-ground and cloud-to-cloud flashes</li> <li>SPI and I2C compatible interface</li> </ul> </li></ul>
  • Set-up options:
    • Self-assembly kit: Yes
  • Operational properties:
    • Coding skill level: 2
    • Electronics skill level: 2
    • Mechanics skill level: 2
    • Soldering skill level: none

Additional information

Weight415 g
Dimensions5,80 × 18,00 × 15,50 cm



level 2


level 2


level 2


Online Manual

Click this line to view the Online Manual


Infosheet Earth Listener EN
Overview of Velleman modules that are equal to D.I.Y Kits
This sheet is useful when you want to know which modules you could find in the do-it-yourself range of Velleman Kits and minikits.

Spare Parts


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