CO2 Monitoring

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The Source Information

Based on

Which I saw on twitter

But this doesn't seem to have an alarm, or log data with time for unattended monitoring. So will take this as the basis and try and add a data logger, RTC, warning alarm and Traffic light for alert status......

Parts List
CO2 Sensor Module
Either the MH-Z19B or the MH-Z19C or the MH-Z14A NDIR CO2 Sensor Modules (MH-Z14A NDIR CO2 Module 5000PPM PWM NDIR Serial Port Single Channel as it does 0-5000ppm where the 19 seems to be 400 to 2000ppm and it is cheaper. This may be a mistake but we'll see :) )
RTC Module
SD or Micro SD Memory Card Reader
Some Red, Yellow and Green LEDs
A Piezo Beeper
A small display of some kind
An Arduino (Nano or Uno?)