CO2-Sensor for Schools

The CO2-Sensor indicates when a classroom should be ventilated to improve air quality.

Especially in times of Covid-19 a necessity!

The project was initiated by the Statistical Office of the Canton of Zurich in partnership with Make.Human.Technology and the Swiss Statistical Society, with the kind support of MakeZurich and volunteer supporters.

https://github.com/statistikzh/co2sensoren

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The advantages

Hands-on learning

Build your own sensor and get hands-on experience on topics of the future: Internet of Things, technology, programming, sensors, statistics and data

Optimize ventilation

Ensure optimal air quality in the classroom through monitoring & analysis

Didactical templates

Course preparation and experiments after assembly are included for classroom integration

Swiss Design & Quality

Our device is designed in Switzerland and uses a sensor from Sensirion, a swiss company.

Direct Support

Online-Exchange for Questions and Support

Extensive Documentation

Video material and detailed assembly and programming instructions

Optional Connectivity

Save sensor data to a swiss cloud service to view and analyze. WLAN or LoraWAN are supported.

We have put together three basic packages that cover different needs and technical starting points.

Standalone

  • Traffic light for CO2 level visible on device (green, orange, red)
  • Shows CO2, Temperature and Humidity via Bluetooth with an app (iOS/Android)
  • data export possible, requires USB cable (included)
  • Price per kit: from 99.-
  • Operating costs per year: none

Connect WLAN

  • Traffic light for CO2 level visible on device (green, orange, red)
  • Shows CO2, Temperature and Humidity via Bluetooth with an app (iOS/Android) 
  • Data storage on Switzer.cloud, access via API
  • Prerequisite: WLAN reception in the classroom
  • Price per kit: from 99.-
  • Operating costs per year: 12 CHF per kit for Switzer.cloud; optional: 24 CHF per kit for Colibird

Connect LoraWAN

  • Traffic light for CO2 level visible on device (green, orange, red)
  • Shows CO2, Temperature and Humidity via Bluetooth with an app (iOS/Android) 
  • Data Storage on Switzer.cloud, Access via API
  • Prerequisites: LoraWAN Gateway (from 380.-) or Swisscom LPN 
  • Price per kit: from 120.-
  • Operating costs per year: 12 CHF per kit for Switzer.Cloud; optional: 24 CHF per kit for Colibird
    plus: one-time purchase of LoRaWan gateway from 380 CHF or Swisscom LPN (9 francs per kit and year)

Devices with the option to export data to the cloud (switzer.cloud from Brunata on servers in Switzerland) make it possible to produce individual evaluations, for example to compare the values of all classrooms in a school building or to evaluate the CO2 value over the course of a lesson.

Privacy Policy (excerpt)

  • The sensors transmit data to a central server via a secure path using WiFi or LoraWAN
  • The data and metadata stored on the server are anonymized so that individual schools cannot be identified
  • The schools are data owners of the data of "their" sensors. They can have their data deleted from the server. They can release their anonymized data for use at the cantonal level (opt-in)
  • The schools or teachers and students can obtain their own data as well as the released data of other schools via the central server and thus undertake data evaluations and visualizations.
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The build your own CO2-sensor kit consists of:

  • Sensirion SCD30 CO2 sensor (measures CO2, humidity and temperature)
  • transparent case made of plexiglass
  • Bottom side in the color of your choice  3D printed
  • NodeMCU ESP32 microprocessor with WLAN and Bluetooth
  • connection cables
  • Connection board
  • USB cable
  • Screw and nut
  • LED display of choice (stick or ring)
  • optional: BME680 sensor (measures additional volatile organic compounds)
  • optional: LoraWAN modem

Designed in CH

Connectivity

Yearly cost per Kit
(invoiced separate)

Connect WLAN

Switzer.cloud
12.- per Year and Kit
12.- per Year and Kit
Colibird
24.- per Year and Kit
24.- per Year and Kit

Connect LoraWAN

Switzer.cloud
12.- per Year and Kit
12.- per Year and Kit
Colibird
24.- per Year and Kit
24.- per Year and Kit
Swisscom LPN
9.- per Year and Kit
9.- per Year and Kit
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