Enabling the Future Internet for Smart Cities

Enabling the Future Internet for Smart Cities

Internet of Trees

This project aims open source prototypes for monitoring the environment using free-design hardware and open source software. The first prototype has a tree unit station and a base station. The tree station gets data from the tree and the environment before sending the data to the base station that will be interconnected to the InterSCity Platform. The stations has been developed in partnership with the group managed by Prof. Marcos Buckeridge, from Instituto de Biociências – Universidade de São Paulo in the context of the INCT InterSCity.

By now, the units offer:

  • Light, Humidity, Temperature sensors;
  • Measurement of  sap flow in plant stem;
  • Battery status;
  • Web portal for local data visualization.


Instituto de Matemática e Estatística – USP

  • Antonio Deusany de Carvalho Junior (Contact point)
  • Prof. Alfredo Goldman
  • Prof. Fabio Kon

Instituto de Biociências – USP

  • Janaina Silva
  • Lauana Oliveira
  • Giuliano Locosselli
  • Prof. Marcos Buckeridge

Institut Supérieur de l’Electronique et du Numérique (ISEN)

  • Anne-Camille Le Corre
  • Oumeima El Isbihani

Sensor stations

The sensor stations were produced with a focus on low-cost hardware considering that the main idea is to reproduce the stations in large scale and monitor big cities. The hardware and software used in these stations were:


  • Raspberry Pi
  • Arduino Nano microcontroller
  • MCP3421 A/D conversor
  • DHT11 sensor
  • BP557B bipolar transistor
  • TP4056 recharding unit
  • Modelix 006 – Painel Solar 5V 120mA
  • NRF24L01 radio transceiver


  • PHP
  • MySQL
  • CSS
  • JavaScript
  • Python
  • Bootstrap

A better description of each unit of the station is described in next sections.

Unit prototype

The first prototype was created by Anne-Camille and Oumeima during their internship at Universidade de São Paulo. An Arduino-based sensor station was created using low-cost components and inspired other solutions available on the market. The hardware-design is presented below.

IoT free-design hardware schematics

In order to protect the final hardware, a 3D case was projected. This case fits all the sensors, hardware, and batteries. The idea of using an Arduino Nano over a breadboard was intentional. This approach allows other sensors to be easily attached without modifying the case in most of the cases. Below we have some images of the front and back side of the protective case.

IoT case (front side 3D model)
IoT case (front side printed)
IoT case (back side printed)
IoT case (back side printed)

Web Portal

The first prototype of the web portal was also developed by Anne-Camille and Oumeima. This portal shows the data available at the Raspberry Pi base station. A single visualization of this portal is presented below.

Web Portal