CO2 monitor with LCD display
thingiverse
# Quick description: SCD30 combined CO2/temp/humidity sensor with LCD 1602 display. # Operation: The device connects to WiFi and MQTT broker and checks sensor is ok, showing the status at each stage. A heartbeat symbol flashes top right every 10 seconds to show the MQTT connection is alive. # Hardware: Blue backlight I2C LCD1602(1602 Serial LCD Module Display) brand GeekPi Adafruit SCD30 sensor (from AliExpress - cheaper but less accurate sensors are SGP30 or CCS811) Wemos D1 mini v4.0.0 is used for I2C cable connection Double sided sticky tape to mount (and insulate) Wemos onto LCD M2 x 5mm screws # Connections: SCD30 via 3V/GND/SCL/SDA (i2c address 0x61) LCD1602 via 5V/GND/SCL/SDA (i2c address 0x27) # Code on my github: https://github.com/877dev/CO2-Sensor # Further reading: https://wiki.52pi.com/index.php?title=Z-0234 //GeekPi product official website https://arduinogetstarted.com/tutorials/arduino-lcd-i2c https://www.makerguides.com/character-i2c-lcd-arduino-tutorial
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