EcoSense@clock

Tiny, simple and cheap indoor air quality controller with meteo station, clocks, OLED and web-reporting using Arduino Nano and ESP-01S

Photos and more description at Hackaday.io

Features list

• 3 monitored environment indicators
• 7 sensors for assessment of gas impurities in air
• Web reporting (ThingSpeak API, 2 channels)
• On-screen warnings
• Real-time clock
• .96" SSD1306 OLED display
• 5V and 3.3V power adapter
• Intelligent power management (no more than .4A current)
• Modular, event-driven architecture (using Processy Firmware Framework)
• Small memoty consuption and footprint
• Easy support and upgrade

Intelligent power management scheme

• Constantly active devices (total: ~150mA):
  • Arduino Nano: ~20mA
  • DS3211: <1mA
  • BME280: 1mA
  • ESP-01: max 120mA (3.3V)
  • OLED: max 15mA
  • MH-Z19B: max 150mA // CO2 sensor
  • Sensor button // switch through on-screen warnings list
• Periodically powered:
  • Group 1
    • CJMCU-1100: max 190mA // Formaldehyde Benzene Toluene
    • MQ-136: max 150mA // Hydrogen Sulfide
  • Group 2
    • MQ-135: max 150mA // Air Quality (CO, Ammonia, Benzene, Alcohol, smoke)
    • MQ-4: max 150mA // methane
  • Group 3
    • MQ-7: max 150mA // CO sensor
    • PPD-42NS: max 90mA // particle sensor, currently measures only PM2.5