Console Read

This example for a Yún device reads data coming from Bridge using Console.read() and stores it in a string.

To see the Console, pick your Yún's name and IP address in the Port menu then open the Serial Monitor. You can also see it by opening a terminal window and typing: ssh root@ yourYunsName.local 'telnet localhost 6571' then pressing enter. When prompted for the password, enter it.

When running this example, make sure your computer is on the same network as the Yún device.

Hardware Required

  • Yún board or shield
  • computer and Yún device on the same wireless network

Circuit

There is no circuit for this example.

image developed using Fritzing. For more circuit examples, see the Fritzing project page

Code

Include the Console library, which inherits from Bridge.
#include <Console.h>

Create a string to hold the information from the Bridge
String name;

In setup() initialize the Bridge and Console. Wait for a Console connection, then ask for some information :

void setup() {
  Bridge.begin();
  Console.begin();

  while (!Console);

  Console.println("Hi, what's your name?");
}

In loop(), check to see if there are bytes in the Console buffer. If there's something available, read the the oldest character into a local variable.

void loop() {
  if (Console.available() > 0) {
    char c = Console.read();
 

If the character is a newline ("\n"), it is the last character in the incoming string. Print out the string to the Console, ask for more information, and clear the string.

if (c == '\n') {
      Console.print("Hi ");
      Console.print(name);
      Console.println("! Nice to meet you!");
      Console.println();
      Console.println("Hi, what's your name?");
      name = "";
    }
}

If the character in the buffer is not a newline, add it to the end of the string.

else {     
      name += c;
    }
  }
}

The complete sketch is below :

/*
Console Read example for YunShield/Yún

 Read data coming from bridge using the Console.read() function
 and store it in a string.

 To see the Console, pick your Yún's name and IP address in the Port menu
 then open the Port Monitor. You can also see it by opening a terminal window
 and typing:
 ssh root@ yourYunsName.local 'telnet localhost 6571'
 then pressing enter. When prompted for the password, enter it.

 created 13 Jun 2013
 by Angelo Scialabba
 modified 16 June 2013
 by Tom Igoe

 This example code is in the public domain.

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

 */


#include <Console.h>

String name;

void setup() {
  // Initialize Console and wait for port to open:
  Bridge.begin();
  Console.begin();

  // Wait for Console port to connect
  while (!Console);

  Console.println("Hi, what's your name?");
}

void loop() {
  if (Console.available() > 0) {
    char c = Console.read(); // read the next char received
    // look for the newline character, this is the last character in the string
    if (c == '\n') {
      //print text with the name received
      Console.print("Hi ");
      Console.print(name);
      Console.println("! Nice to meet you!");
      Console.println();
      // Ask again for name and clear the old name
      Console.println("Hi, what's your name?");
      name = "";  // clear the name string
    } else {     // if the buffer is empty Cosole.read() returns -1
      name += c; // append the read char from Console to the name string
    }
  } else {
    delay(100);
  }
}

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
  • 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.
  • WiFi Status - Prints information about the status of your wifi connection.
  • 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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