[136] | 1 | /*
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| 2 | Temperature web interface
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| 3 |
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| 4 | This example shows how to serve data from an analog input
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| 5 | via the Arduino Y炭n's built-in webserver using the Bridge library.
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| 6 |
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| 7 | The circuit:
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| 8 | * TMP36 temperature sensor on analog pin A1
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| 9 | * SD card attached to SD card slot of the Arduino Y炭n
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| 10 |
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| 11 | This sketch must be uploaded via wifi. REST API must be set to "open".
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| 12 |
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| 13 | Prepare your SD card with an empty folder in the SD root
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| 14 | named "arduino" and a subfolder of that named "www".
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| 15 | This will ensure that the Y炭n will create a link
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| 16 | to the SD to the "/mnt/sd" path.
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| 17 |
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| 18 | In this sketch folder is a basic webpage and a copy of zepto.js, a
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| 19 | minimized version of jQuery. When you upload your sketch, these files
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| 20 | will be placed in the /arduino/www/TemperatureWebPanel folder on your SD card.
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| 21 |
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| 22 | You can then go to http://arduino.local/sd/TemperatureWebPanel
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| 23 | to see the output of this sketch.
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| 24 |
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| 25 | You can remove the SD card while the Linux and the
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| 26 | sketch are running but be careful not to remove it while
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| 27 | the system is writing to it.
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| 28 |
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| 29 | created 6 July 2013
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| 30 | by Tom Igoe
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| 31 |
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| 32 | This example code is in the public domain.
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| 33 |
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| 34 | http://arduino.cc/en/Tutorial/TemperatureWebPanel
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| 35 |
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| 36 | */
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| 37 |
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| 38 | #include <Bridge.h>
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| 39 | #include <YunServer.h>
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| 40 | #include <YunClient.h>
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| 41 |
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| 42 | // Listen on default port 5555, the webserver on the Y炭n
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| 43 | // will forward there all the HTTP requests for us.
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| 44 | YunServer server;
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| 45 | String startString;
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| 46 | long hits = 0;
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| 47 |
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| 48 | void setup() {
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| 49 | Serial.begin(9600);
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| 50 |
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| 51 | // Bridge startup
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| 52 | pinMode(13, OUTPUT);
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| 53 | digitalWrite(13, LOW);
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| 54 | Bridge.begin();
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| 55 | digitalWrite(13, HIGH);
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| 56 |
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| 57 | // using A0 and A2 as vcc and gnd for the TMP36 sensor:
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| 58 | pinMode(A0, OUTPUT);
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| 59 | pinMode(A2, OUTPUT);
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| 60 | digitalWrite(A0, HIGH);
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| 61 | digitalWrite(A2, LOW);
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| 62 |
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| 63 | // Listen for incoming connection only from localhost
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| 64 | // (no one from the external network could connect)
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| 65 | server.listenOnLocalhost();
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| 66 | server.begin();
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| 67 |
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| 68 | // get the time that this sketch started:
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| 69 | Process startTime;
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| 70 | startTime.runShellCommand("date");
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| 71 | while (startTime.available()) {
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| 72 | char c = startTime.read();
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| 73 | startString += c;
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| 74 | }
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| 75 | }
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| 76 |
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| 77 | void loop() {
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| 78 | // Get clients coming from server
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| 79 | YunClient client = server.accept();
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| 80 |
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| 81 | // There is a new client?
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| 82 | if (client) {
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| 83 | // read the command
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| 84 | String command = client.readString();
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| 85 | command.trim(); //kill whitespace
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| 86 | Serial.println(command);
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| 87 | // is "temperature" command?
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| 88 | if (command == "temperature") {
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| 89 |
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| 90 | // get the time from the server:
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| 91 | Process time;
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| 92 | time.runShellCommand("date");
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| 93 | String timeString = "";
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| 94 | while (time.available()) {
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| 95 | char c = time.read();
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| 96 | timeString += c;
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| 97 | }
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| 98 | Serial.println(timeString);
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| 99 | int sensorValue = analogRead(A1);
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| 100 | // convert the reading to millivolts:
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| 101 | float voltage = sensorValue * (5000 / 1024);
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| 102 | // convert the millivolts to temperature celsius:
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| 103 | float temperature = (voltage - 500) / 10;
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| 104 | // print the temperature:
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| 105 | client.print("Current time on the Y炭n: ");
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| 106 | client.println(timeString);
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| 107 | client.print("<br>Current temperature: ");
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| 108 | client.print(temperature);
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| 109 | client.print(" degrees C");
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| 110 | client.print("<br>This sketch has been running since ");
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| 111 | client.print(startString);
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| 112 | client.print("<br>Hits so far: ");
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| 113 | client.print(hits);
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| 114 | }
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| 115 |
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| 116 | // Close connection and free resources.
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| 117 | client.stop();
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| 118 | hits++;
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| 119 | }
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| 120 |
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| 121 | delay(50); // Poll every 50ms
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| 122 | }
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| 123 |
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| 124 |
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| 125 |
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