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.

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 Yún101/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

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