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IoT course 2020/2021 Final Project

Final project presented at the end of the Internet Of Things course for the academic year 2020/2021.


Description

The idea behind this project is to implement a basic weather station to monitor the following parameters:

  • temperature
  • humidity
  • brightness

The first two are obtained with the usage of a HTU21D sensor. Ambient brightness is measured by a photoresistor.

In case the temperature exceeds a certain threshold, MAX_TEMP, a coolingfan - controlled by a relay - is turned on.
Said fan is turned off once the temperature reaches an acceptablevalue: MIN_TEMP.

A cardboard panel is attacched to a servo motor. When the device reads a stable, high value of brightness for a period of time that is greater than UNCOVER_TIME, the motor will turn and the panel will cover the sunlight.
After a fixed period of time, COVER_TIME, the motor will turn back, thus exposing the device to full light again.
If the room is not bright enough a led will be turned on to simulate a lighting control system.

The user can interact with the device through a web interface. It shows the data collected by the sensors and gives the user the option to change the value of the following variables:
MAX_TEMP, MIN_TEMP, COVER_TIME, UNCOVER_TIME.


Implementation

The firmware has been produced with a version of the Python language derived from the Zerynth SDK for IoT platforms.

The user interface is web-based and implemented in HTML, CSS and Javascript.

The exchange of data between the device and the webpage is achieved using the MQTT message protocol.


Components

  • ESP32-DevKitC development board
  • HTU21D temperature and humidity sensor
  • Servo motor (Tower Pro SG90)
  • Single relay board (Parallax Inc)
  • PC cooling fan
  • Breadboard
  • Photoresistor
  • LED
  • 220 Ohm resistor
  • 10k Ohm resistor
  • 12x M/M jumper wires
  • 12x M/F jumper wires

How it looks

Overview

Overview

Web Interface

Web Interface


License

Distributed under the MIT License.