# ESP8266 WeatherStation

Compact outdoor weather station.

Features:
* Temperature
* Humidity
* Pressure
* dust particles PM10 (10µm) and PM2.5 (ultrafine, 2.5µm)
* radioactivity
* WiFi
* needs 5V power supply
* opensensemap.org API

Power consumption:
* ~50mA @ 5V
* (31mA idle + fan + wifi)

CAD files (OpenSCAD) and source code included.


![Weatherstation](cad/img/weatherstation.jpg)

| geiger counter and DHT22              | particle sensor and ESP8266             |
|---------------------------------------|-----------------------------------------|
| ![Weatherstation](cad/img/geiger.jpg) | ![Weatherstation](cad/img/particle.jpg) |

## Installation Instructions

1. git clone https://dev.xd0.de/hendrik/esp-weatherstation.git
2. cd esp-weatherstation
3. virtualenv -p python --no-site-packages .
4. source bin/activate
5. pip install -U platformio
6. platformio run --target upload && platformio device monitor -b 115200

## Wiring

            NodeMCU v0.9
                                               SDS011
             A0      D0
            RSV   (5)D1 ----------------------- TXD
            RSV   (4)D2 ----------------------- RXD
            RSV   (0)D3 -- BMP_SDA        .---- GND
            RSV   (2)D4 -- BMP_SCL        |     ...
            RSV     3V3 -- BMP_VCC        | .--- 5V
            RSV   .-GND -- BMP_GND        | |   ...
            GND  =C= D5                   | |   ...
            3V3   '- D6 ------------.     | |
            GND      D7 -- DHT_DATA  \    +-| --------- GND
            3V3      D8               \   | +----------  5V
             EN      RX                '- | ----------- VIN  
            RST      TX                   | |
            GND -.   GND - DHT_GND        | |        GeigerCnt
        .--  5V  |   3V3 - DHT_VDD        | |
        |        '------------------------' |
        '-----------------------------------'

SDS011:
 - TXD -> D1
 - RXD -> D2
 - GND -> GND
 - 
 - 5V  -> 5V
 - 
 - 

DHT22:
 - VDD  -> 3V3
 - DATA -> D7
 -      ->
 - GND  -> GND

RadiationD-v1.1(CAJOE):
 - GND -> GND
 - 5V  -> 5V
 - VIN -> D6


12V power mod with step down converter and voltage divider for voltage measurement:

    BAT+ --[FUSE]--+--------------.
                   \R\            |
                    \1\           '
                      >---+--------------------------------- A0
                    /R/   |       .    ________________
                   /2/   === C1   +---| buck converter |---- 5V
    BAT- ----------'------+-----------|________________|---- GND

  Example values: R1=1MΩ, R2=100kΩ, C1=some ceramic capacitor (optional)
  measures up to ~30V

## ToDo
* https://tinker.yeoman.com.au/2016/05/29/running-nodemcu-on-a-battery-esp8266-low-power-consumption-revisited/
* deep_sleep (connect D0 to RST)
* https://hackaday.com/2014/10/25/use-a-cheap-pin-diode-as-a-geiger-counter/ (opengeiger.de/elektronik.html)
* Solar power

## License

### Code
WTFPL: http://www.wtfpl.net/about/

### Sensor Data
Public Domain: https://opendatacommons.org/licenses/pddl/summary/