Kumekay Home Monitoring Device

System for measurement CO2/Humidity/Temperature/Pressure with OLED display and data upload through WiFi

If you want to use BME280 instead of SI7021+BMP085 take a look on BME280 branch

Discussion

Components

• CO2 Sensor MH-Z19
• ESP8266 (NodeMCU ESP12+ based)
• SSD1306 0.96" 128x64 i2c OLED. Library: https://github.com/olikraus/u8g2
• Humidity/Temperature SI7021 i2c. Library: https://github.com/LowPowerLab/SI7021
• Pressure/Temperature BMP085 i2c. Library: https://github.com/adafruit/Adafruit-BMP085-Library

Case

Model for printing kuhomon_case.stl

Known issues:

• To fit system to this case you have to use short wires
• Temperature measurements seems to be higher due to heat from ESP8266

TODO

• Add offline support (show data on screen without WiFi)