Temparature and humidity controller.

Table of contents

• General info
• Requirements
• Setup

General info

This project is distributed system for wireless temperature and humidity monitoring using PaspberryPi and XBee modules.

Requirements

System was build with:

• 2 pieces RapsberyPi 3B +

• 2 pieces ARPI600 Expansion Board

• 2 pieces XBee 2mW Wire Antenna - Series 2 (ZigBee Mesh)

• 2 pieces DH11 Temperature & Humidity Sensor

Setup

1. Configuration of RPis settings and installation of required software and libraries for XBee radio communication.

• The first step is enabling serial port of RaspberryPi to be able to connect using SSH.

• Then next is installing required libraries: GPIO, XBee, and LAMP.

• On the computer that we will use to connect to the RaspberryPi, we must install the USB driver for UART (cp2102 driver) and Digi software to support XBee modules called XCTU.

• In the next step, connect the RPi through the ARPI600 board using a USB cable and set the jumpers on the board as shown on the photo below

• Now we can connect to RPi using SSH.

• Next set up XBee wireless module connections using Digis XCTU tool. First we need to move the jumpers on the board as below

• Configure the XBee 1 module as COORDINATOR:

• Configure the XBee 2 module as END DEVICE:

• test connectivity

2. Implementation of necessary scripts to support communication between the coordinating and end device.
   • Scripts for first RPi which is the coordinator
     • pro_coordinator.py
     • pro_web.py - script used for update the measurement results from the end device
     • simple php website for measurements display
   • Scripts for second RPi which is the end device
     • pro_end.py
     • systemctl - autostart settings on the end device