#358 CO2 Cuckoo Clock for schools and businesses (Why not eCO2?)

In video #300, I postulated that each classroom should have a CO2 sensor against sleepiness. For a few days, we have a second reason that probably created a better business case for your project: The fear of a next lockdown might convince the school and other managers more because CO2 measurements in rooms can also reduce aerosols in the air. I also show why eCO2 sensors are not a good idea for this purpose.

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ESP32 mini: https://s.click.aliexpress.com/e/_AFgYK7 or https://bit.ly/2ohsawD or https://amzn.to/2Tp67zX
SCD30: https://s.click.aliexpress.com/e/_ADEo0R or Digikey
Senseair S8 Sensor: https://s.click.aliexpress.com/e/_9ymDrl (seems to be better than the MH-Z19)
MH-Z19 Sensor: https://s.click.aliexpress.com/e/_9897R9
MP3 player: https://s.click.aliexpress.com/e/_A9jfHH
PAM8403 Stereo Amplifier: https://s.click.aliexpress.com/e/_A3y6Hv or https://amzn.to/2Tp67zX
Prototype PCBs: https://s.click.aliexpress.com/e/_9QWZk7 or https://amzn.to/2HuXEZO (I used a 3x7cm PCB)
10W loudspeaker: https://s.click.aliexpress.com/e/_AORPnp

Sketch: https://github.com/SensorsIot/CO2-Cuckoo-Clock
DFplayer: https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299
Birds: https://www.thingiverse.com/thing:579484
Linear Servo #1: https://www.thingiverse.com/thing:896781
Linear Servo #2: https://www.thingiverse.com/thing:3170748

CO2 Ampel: https://www.umwelt-campus.de/forschung/projekte/iot-werkstatt/ideen-zur-corona-krise-1

0:00 Intro
1:00 Introduction
1:39 Agenda
2:37 A Fake
3:12 Start of build
4:48 CO2 sensors
9:12 Dangerous CO2 concentrations
10:22 Sensor selection
10:44 System overview
10:56 The animated cuckoo
11:56 Sound system
13:40 Summary

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