Arduino for the Cloud : Arduino Yun and Dragino Yun Shield by Claus Kuhnel

Author:Claus Kuhnel [Kuhnel, Claus]
Language: eng
Format: azw3
Publisher: Universal Publishers
Published: 2017-03-31T04:00:00+00:00

Several instructions client.print() send these data back to the HTML page.

client.print("Current temperature:");

client.print(temperature);

client.println("degreesC");

If the request is answered by the web server, the client connection can be closed and used resources are freed. The variable hits is incremented finally, to get the number of queries.

Figure 42 shows the described query of the ambient temperature from a web browser.

Figure 42 Temperature query

/*

Temperature web interface

This example shows how to serve data from an analog input

via the Arduino Yun’s built-in web server using the

Bridge library.

The circuit:

* TMP36 temperature sensor on analog pin A1

* SD card attached to SD card slot of the Arduino Yun

Prepare your SD card with an empty folder in the SD root

named "arduino" and a subfolder of that named "www".

This will ensure that the Yun will create a link

to the SD to the "/mnt/sd" path.

In this sketch folder is a basic webpage and a copy of

zepto.js, a minimized version of jQuery. When you upload

your sketch, these files will be placed in the

/arduino/www/TemperatureWebPanel folder on your SD card.

You can then go to

http://arduino.local/sd/TemperatureWebPanel

to see the output of this sketch.

You can remove the SD card while the Linux and the

sketch are running but be careful not to remove it while

the system is writing to it.

created 6 July 2013

by Tom Igoe

This example code is in the public domain.

*/

#include <Bridge.h>

#include <YunServer.h>

#include <YunClient.h>

// listen on default port 5555 ; the web server on the Yun

// will forward all the HTTP requests for us there.

YunServer server;

String startString;

long hits = 0;

void setup() {

Serial.begin(9600);

// bridge startup

pinMode(13,OUTPUT);

digitalWrite(13, LOW);

Bridge.begin();

digitalWrite(13, HIGH);

// using A0 and A2 as vcc and gnd for the TMP36 sensor:

pinMode(A0, OUTPUT);

pinMode(A2, OUTPUT);

digitalWrite(A0, HIGH);

digitalWrite(A2, LOW);

// listen for incoming connection only from localhost

// (no one from the external network could connect)

server.listenOnLocalhost();

server.begin();

// get the time that this sketch started:

Process startTime;

startTime.runShellCommand("date");

while(startTime.available()) {

char c = startTime.read();

startString += c;

}

}

void loop() {

// get clients coming from server

YunClient client = server.accept();

// there is a new client?

if (client) {

digitalWrite(13, LOW);

// read the command

String command = client.readString();

command.trim(); //kill whitespace

Serial.println(command);

// is "temperature" command?

if (command == "temperature") {

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