weather-station

Reimplementation and extension weatherstation uisng 2 Nodemcu esp32 in a master slave configuration.

Sensors and Hardware

• master node (weather_master.ino)

  • BME280 temperature/pressure/humidity sensor
  • DS3231-mini rtc
  • MQ-7 CO sensor

• slave node (weather_outside.ino)

  • GUVA-S12SD analog UV sensor
  • BME280 temperature/pressure/humidity sensor

Other hardware

• generic SPI SD card adapter up to 32G
• SSD1306 128x64 monochrome display

Features

Software features

• Logging of sensor data on a set interval.
  • data from slave device - Temperature, Humidity, Pressure, UV index.
  • data from master device - Temperature, Humidity, Pressure, Altitude, CO ppm.
• Clock syncing with ntp.
• Clock with daylight savings/timezone adjustments.
• Moon rise/set calculation using MoonRise.h.
• Moon angle and illuminated surface using moonPhase.h.
• Sun rise/set calculation SunRise.h.
• Showing curated information for the sensors on display.
• Short term weather forecast and pressure trend using zambretti algorithm (modified to have persistent data of past predictions with a file on the S card).
• Persistent configuration of some parameters via a json file.
• Battery % reporting from slave device. (currently unused)

Network features

• Connects to a wireless network with provided credentials.
• Creates its own hotspot with baked in password and ssid if it cant find it/connect.
• Very simple configuration page to edit some of the settings. Changing a setting would require a restart to take effect.
• A simple dashboard to show information from sensors every few seconds.
• Web pages are intentionally spartan and are more of a proof of concept.
• Ntp client to synchronise clocks if connected to a network.
• Slave device communicates over esp_now.

Configuration

File should be placed in sd card root conf.json

    {
        "ssid":"Rosko",       // ssid connect to
        "pass":"12345678",    // password for that network
        "dssid":"E32Wtr-St",  // ssid of default hotspot
        "dpass":"12345678",   // password to be set there
        "gmt":"2",            // gmt compensate
        "useds":"1",          // use Daylight savings
        "syncntp":"1",        // enable syncing with ntp
        "log_delay":"600000", // log interval in ms
        "lat":"42.6977",      // Latitude
        "lon":"23.3219"       // Longitude
    }

Display

• CO ppm
• Atmospheric reading.s inside (temp,pressure,altitude,humidity)
• Atmospheric readings outside (temp,pressure,humidity, uv idx)
• Time and Date, current IP of device
• Time and Date adjusted with Daylight savings and Timezone, current IP of device
• Time of Sunrise, Sunset, Moonrise, Moonset moon phase angle and illumination %
• Weather forecast and Pressure trend
• Runs in its own thread.

Requirements

• Moon and Sun calculations
  • MoonPhase
  • MoonRise
  • SunRise
• CO detector
  • MQ7Sensor
• SD card fs and Configuration
  • FS
  • SD
  • SPI
  • ArduinoJson
• Web server
  • ESPAsyncWebSrv
  • WiFiProv
  • WiFi
• RTC
  • NTPClient
  • DS3231
• Display
  • Adafruit_SSD1306
• BME280
  • Adafruit_BME280

Hardware Realisation