StofAnanas

Project StofAnanas
Showing particulate matter concentration as a coloured light
Status	Initializing
Contact	bertrik
Last Update	2019-06-16

The idea

Show current airborne particulate matter concentration using a LED light in a lamp, inspired by http://stoflamp.nl The data that the LED colour is based on is simply retrieved over WiFi from the luftdaten website.

This lamp is a plastic pine apple ("ananas"), bought at the "Action" store.

Concepts/ideas:

• The lamp shows particulate matter concentration as a colour, e.g. soft/positive colours for low concentration and hard/bright colour for high concentration
• The lamp "breathes" by varying the intensity over time, e.g. a cycle of 10 seconds where the light dims a bit and brightens a bit. Perhaps we can increase the breathing rate as well for higher PM.
• The lamp retrieves the PM value over wifi from the the luftdaten website

Nice to have:

• Automatic determination of location by means of wifi location
• Remote control over IR

Hardware

pinout

The lamp is controlled by an ESP8266, a Wemos D1 mini board. The LEDs used has a built-in PL9823 controller.

Software

Software is available on github.

Luftdaten interface

The current measurement value of a particular sensor can be retrieved over a REST interface, using URL

 http://api.luftdaten.info/v1/sensor/<sensor-id>/

where <sensor-id> is the database id used by luftdaten (and visible on their map). The trailing slash in the URL is significant.

For example:

 http://api.luftdaten.info/v1/sensor/12246/

A HTTP GET results in a JSON structure like this:

Arduino libraries

Libraries:

• WiFiManager is used to manage WiFi connection to the local AP
• FastLED is used to control the LED
• ArduinoJSON for the parsing the luftdaten response