Skip to main content

Virtual Sensor implementation in Contiki NG OS

Native Temperature, Humidity and Pressure Sensor in Contiki NG 

Implementation of Three sensors namely temperature, humidity and pressure sensor in contiki NG OS.

We need four files namely

Step 1: Create a Folder called temperature/ in the folder contiki-ng/examples/
and then copy paste the following four files to the above folder.

// mytemp.h
#ifndef MYTEMP_H
#define MYTEMP_H
struct Sensor {
 char name[15];
 float value;
struct Sensor read_temperature();
struct Sensor read_humidity();
struct Sensor read_pressure();

// mytemp.c
#include "mytemp.h"
#include <string.h>
#include <stdlib.h>

float random_value(float min, float max)
 float scale = rand() / (float) RAND_MAX;
 return min + scale * (max - min);

struct Sensor read_temperature()
 struct Sensor temp;
 strncpy(, "Temperature", 15);
 temp.value = random_value(0, 35);
 return temp;
struct Sensor read_humidity()
 struct Sensor humdidty;
 strncpy(, "Humidity", 15);
 humdidty.value = random_value(40, 80);
 return humdidty;

struct Sensor read_pressure()
 struct Sensor pressure;
 strncpy(, "Pressure", 15);
 pressure.value = random_value(30, 78);
 return pressure;

// demo.c
#include "contiki.h"
#include "sys/etimer.h" //etimer Event Timer
#include "mytemp.h"
#include <stdio.h>

PROCESS(sensor_process, "Sensor process");

static struct etimer timer;

PROCESS_THREAD(sensor_process, ev, data)
 printf("Native Sensor\n");
while(1) {
 etimer_set(&timer, CLOCK_SECOND*2);

 struct Sensor temp = read_temperature();
 printf("%s: %.2f\n",, (double)temp.value);

 struct Sensor hum = read_humidity();
 printf("%s: %.2f\n",, (double)hum.value);

struct Sensor pressure = read_pressure();
 printf("%s: %.2f\n",, (double)pressure.value);



CONTIKI = ../../
include $(CONTIKI)/Makefile.include

To run this File

Open a Terminal  and go to contiki-ng/examples/temperature/

$] cd contiki-ng/examples/temperature
$] make TARGET=native 
$] ./demo.native

Please see the screenshot below:
Sensors in Contiki NG

Sensors in Contiki NG
Sensors in Contiki NG


  1. How to average them and print the average value through seperate process thread?

  2. May be you can calculate manually.


Post a Comment

Popular posts from this blog

Installing ns-3.34 in Ubuntu 20.04

This post shows how to install ns 3.34 in Ubuntu 20.04 LTS Prerequisites: Fresh installation of Ubuntu Version 20.04 LTS  ns3.34 can be downloaded from here Follow the video link for complete step by step instructions on the installation.  This version fixes the compilation issues of (bug in ns3.33)  Issue the following commands after opening a terminal  $ sudo apt update $ sudo apt install g++ python3 python3-dev python-dev pkg-config sqlite3 python3-setuptools git qt5-default gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar openmpi-bin openmpi-common openmpi-doc libopenmpi-dev tcpdump wireshark libxml2 libxml2-dev Unzip or untar the ns-allinone-3.34.tar.bz2 in the home folder (in my case its /home/pradeepkumar) $ cd ns-allinone-3.34/ $ ./ --enable-examples --enable-tests  Once the installation is completed, you may get an output show

Installation of ns3 in Windows 10 and Windows 11 OS using WSL (Windows Subsystem for Linux)

This post shows how to install ns-3.33 in Windows 10 through WSL (Windows Subsystem for Linux) This posts works for Windows 11 also (I have tested it on a Windows 11 ISO and it works the Same way as mentioned in the following post.) This post will work for ns-3.3x version. Prerequisites : Install Windows Subsystem for Linux with GUI: Please refer the following video  System Information: OS used: Windows 10 and WSL (Ubuntu 20.04) GUI: XServer for Windows NS3 Version: ns-3.33 See the following complete video on how to install ns3 in Windows 10 Step 0 : Open XLaunch Step 1 :  Open WSL using PowerShell and open it as Administrator Command:/  wsl $ xfce4-session The GUI of Ubuntu Opens within Windows 10 OS. Step 2 : Download ns3 from website through Mozilla Firefox browser Step 3: Open a Terminal  $ sudo apt update $ sudo apt install build-essential autoconf automake libxmu-dev python3-pygraphviz cvs mercurial bzr git cmake p7zip-full python3-matplotlib python-tk python3-dev qt5-q

Installing NS-3.32 in Ubuntu 20.04

This is about installing ns version 3.32 in Ubuntu 20.04 LTS. #ns3 #ns3 .32 #networksimulation The commands used in the video are given here. $] sudo apt update $] sudo apt install build-essential autoconf automake libxmu-dev python3-pygraphviz cvs mercurial bzr git cmake p7zip-full python3-matplotlib python-tk python3-dev qt5-qmake qt5-default gnuplot-x11 wireshark Download the ns-allinone-3.32.tar.bz2 package from and copy it to /home/ folder See the full video for detailed instructions Extract it either in GUI or using command $] tar jxvf ns-allinone-3.32.tar.bz2 $] cd ns-allinone-3.32/ $] ./ --enable-examples --enable-tests The above command will take some time to install all the packages  You can see the output as shown below ns3 To check whether ns3 installed successfully, use the following commands. $] cd ns-3.32/ $] ./waf --run hello-simulator You should get the output as Hello Simulator $] ./waf --run first This is the example from the ns-3.32/exa