Tardis CO2-Sensor with Display by BeneMerz

Last crawled date: 3 years, 5 months ago

This is the Tardis of Dr. Who equipped with a display and a CO² sensor. You can use it e. g. in the office to indicate the need for ventilation.
I am using a high quality CO² sensor. It uses the NDIR measurement technology. More information can be found here.
Tardis
As base I have used this thing.
Print the following parts from there:
Base (either ring or solid)
Panel with door
Panel (2x)
Window (2x)
Top ring
Roof
Lamp shade
Lamp top
From here you need to print
tuer_display
befestigung_display
Electronics
Following parts are needed
Wemos D1 mini
Sensirion SCD30 CO2 sensor
2.2 '' display ILI9340
Micro-USB cable
There are three holes on the back of the modified door. The bracket can be glued to these holes to fix the display. The pins of the display are up.
Only two doors are equipped with windows to allow some ventilation. I have glued the sensor with the connection pins to the open window opposite of the display.
Wiring
Sensirion -> Wemos D1 mini
VIN -> 5V
GND -> GND
SCL -> D1
SDA -> D2
Display -> Wemos D1 mini
SDO -> D6
LED -> 3V3
SCK -> D5
SDI -> D7
DC -> D3
RESET -> RST
CS -> GND
GND -> GND
VCC -> 3V3
Software
Install following libraries in your Arduine IDE:
Adafruit GFX
Adafruit ILI9341
TinyWireM
Compile and upload the sketch display_hochkant.ino to the Wemos D1 mini.
Here you can find more information on the display in German.
And on this Github repository you can find other sample code for the CO² sensor.
To assess the measured CO² concentration this page was helpful for me (in German).
Have fun with the Tardis!