WiFiStatus.md

tags	author	title	description
Yún	Arduino	Arduino Yún Yún WiFi Status	Runs a pre-configured script that reports back the strength of the current WiFi network.

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 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);
}

Last revision 2016/05/25 by SM