Yún WiFi Status

This sketch runs a script called "pretty-wifi-info.lua" installed on your Yún device in the folder /usr/bin. It prints information about the status of your WiFi connection.

It uses Serial to print, so you need to connect your Yún device to your computer using a USB cable and select the appropriate port from the Port menu before it will run.

Hardware Required

  • Yún board or shield
  • wireless network

Circuit

There is no circuit for this example.

Attach:Yun_Fritzing.png? image developed using Fritzing. For more circuit examples, see the Fritzing project page

Code

You'll first need to include the Process class :
#include <Process.h>

In setup(), start serial communication, and the Bridge. The sketch won't run until a serial connection is made.

void setup() {
  Serial.begin(9600);
  while(!Serial);      

  Serial.println("Starting bridge...\n");
  pinMode(13,OUTPUT);  
  digitalWrite(13, LOW);  
  Bridge.begin();  
  digitalWrite(13, HIGH);  // Led on pin 13 turns on when the bridge is ready

  delay(2000);  
}

In loop(), initialize a new process that will run the WiFi check script. you can run the script by calling runShellCommand() with the path to the script.

void loop() {
  Process wifiCheck;
  wifiCheck.runShellCommand("/usr/bin/pretty-wifi-info.lua");

Print out any characters returned by the script to the serial monitor, and wair for a few seconds before running again.

while (wifiCheck.available() > 0) {
    char c = wifiCheck.read();
    Serial.print(c);
  }

  Serial.println();

  delay(5000);
}

The complete code is below :

/*
  WiFi Status

 This sketch runs a script called "pretty-wifi-info.lua"
 installed on your Yún in folder /usr/bin.
 It prints information about the status of your wifi connection.

 It uses Serial to print, so you need to connect your YunShield/Yún to your
 computer using a USB cable and select the appropriate port from
 the Port menu

 created  18 June 2013
 By Federico Fissore

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/YunWiFiStatus

 */


#include <Process.h>

void setup() {
  SerialUSB.begin(9600);  // initialize serial communication
  while (!SerialUSB);     // do nothing until the serial monitor is opened

  SerialUSB.println("Starting bridge...\n");
  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);
  Bridge.begin();  // make contact with the linux processor
  digitalWrite(13, HIGH);  // Led on pin 13 turns on when the bridge is ready

  delay(2000);  // wait 2 seconds
}

void loop() {
  Process wifiCheck;  // initialize a new process

  wifiCheck.runShellCommand("/usr/bin/pretty-wifi-info.lua");  // command you want to run

  // while there's any characters coming back from the
  // process, print them to the serial monitor:
  while (wifiCheck.available() > 0) {
    char c = wifiCheck.read();
    SerialUSB.print(c);
  }

  SerialUSB.println();

  delay(5000);
}

See Also

  • Bridge Library - Your reference to the Bridge Library
  • Bridge – Simple REST style calls to access analog and digital pins
  • Console Ascii Table – A complete ASCII table printed to the Console
  • Console Pixel – Turn an LED on and off through the Console
  • Console Read - Read data coming from bridge using the Console.read() function
  • Data Logger - Log data from three analog sensors to an SD card.
  • File Write - How to write file into the Yún filesystem.
  • Http Client - A basic HTTP client that connects to the internet and downloads content.
  • Http Client Console - HTTP client that connects, downloads content and shows it using WiFi and Console.
  • Mailbox Read Message - How to read the messages queue, called Mailbox, using the Bridge library.
  • Process - How to run linux processes using an Yún.
  • Remote Due Blink - How to upload remotely a sketch on DUE boards.
  • Shell Commands - How to run linux shell commands using a Yún.
  • Temperature Web Panel - How to serve data from an analog input via the Yún's built-in webserver.
  • Time check - Gets the time from Linux via Bridge then parses out hours, minutes and seconds.
  • Yún First Configuration - Easily configure your Yún device using Serial Monitor and USB port.
  • Serial Terminal - Use the Yún's 32U4 processor as a serial terminal for the Linux side on the Yún.


Last revision 2016/05/25 by SM