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About this wiki

This is a translation of https://github.com/opendata-stuttgart/meta/wiki, a citizen science project located in Stuttgart, run by Stuttgart Open Knowledge Lab.

Goal

The goal is to build up a sensor network for measuring particulate matter (PM10.0/2.5) in order to obtain a better data coverage of the environmental PM load. This DIY sensor is affordable, easy to assemble, and comes with a preconfigured firmware. Once activated, it sends measured values every 60 seconds to a server via "Freifunk" (https://freifunk.net/en/) or any other Wi-Fi. Maps, graphics and csv of the sensor's data.

Content

• Where to buy
• Loading the firmware
• Assembly (wiring)
• Assembly (individual parts)
• Sensor configuration
• Data base entry
• Links (graphics, sensor infos)
• APIs
• NodeMCU pin-outs v2, v3
• Data sheets, specifications
• Research studies
• Similar projects

Status

https://github.com/opendata-stuttgart/meta/issues

Required electronics

• ESP8266 (WiFi, processor)
• PPD42NS (measuring particulate matter)
• SDS011 (measuring particulate matter), replaces PPD42NS for higher accuracy
• Power supply (micro-USB, power supply of mobile phone or battery)
• Voltage control (3.3V & 5V)
• Bits and pieces (wires, plugs, breadboard...)

Optionally

• DHT22/SHTxx (temperature, humidity)
• BMP180 (barometric pressure, temperature, altitude)
• MQ135 (gas sensor for CO2 etc.)

For programming

• FTDI (3.3V/5V, source: USB & serial)