Removed old WifiCheck and WifiSignalStrengthIndicator examples
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Tom Igoe
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/*
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Arduino Yun Wireless Config Check
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Checks the wireless state of Arduino Yun by calling
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the linux command iwconfig.
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Upload this to an Arduino Yun via serial (not WiFi)
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then open the serial monitor to see the status of
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your Yun's WiFi connection. If it's connected to
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a wireless network, the ESSID (name) of that network
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and the signal strength will appear.
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The circuit:
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* Arduino Yun
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created 22 May 2013
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by Tom Igoe
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This example code is in the public domain.
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*/
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#include <Process.h>
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void setup() {
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Serial.begin(9600); // initialize serial communication
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while(!Serial); // do nothing until the serial monitor is opened
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pinMode(13,OUTPUT);
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digitalWrite(13, LOW);
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Bridge.begin(); // make contact with the linux processor
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digitalWrite(13, HIGH);
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delay(2000); // wait 2 seconds
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Process wifiCheck; // initialize a new process
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wifiCheck.begin("iwconfig"); // command you want to run
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wifiCheck.addParameter("wlan0"); // parameter of the command
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wifiCheck.run(); // run the command
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// while there's any characters coming back from the
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// process, print them to the serial monitor:
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while (wifiCheck.available() > 0) {
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char thisChar = wifiCheck.read();
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Serial.print(thisChar);
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}
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}
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void loop() {
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// nothing to do here.
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}
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@ -1,112 +0,0 @@
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/*
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Wifi Signal Strength Indicator
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This example demonstrates the use of the bridge and process libraries
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to communicate between the Arduino side and the linux side of the Arduino Yun.
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The Linux script returns the strength of the wifi signal.
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The Arduino sketch uses LEDs to indicate whether the current value of
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the signal strength is above, below, or the same as the last value
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The circuit:
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* LEDs on pins 8, 9, and 10
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* Built-in LED on pin 13
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The script:
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The following one line script must exist in the /root directory of the
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linux file system, in a file named "wifiStrength.sh", and it must be executable:
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tail -1 /proc/net/wireless | cut -c22-23
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created 06 June 2013
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by Michael Shiloh
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modified 08 June 2013
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by Tom Igoe
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This example code is in the public domain
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*/
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#include <Process.h>
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// global variable to store the last value of the signal strength
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int lastValue;
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void setup() {
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// set up LED pins as outputs:
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pinMode(8, OUTPUT);
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pinMode(9, OUTPUT);
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pinMode(10, OUTPUT);
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pinMode(13,OUTPUT);
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// Indicate that you're ready by flashing pin 13 LED twice
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for (int flash = 0; flash < 3; flash++) {
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digitalWrite(13,HIGH);
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delay(200);
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digitalWrite(13,LOW);
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delay(800);
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}
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// initialize Serial and Bridge:
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Serial.begin(9600);
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Bridge.begin();
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// Indicate that setup is finished
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digitalWrite(13,HIGH);
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}
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void loop() {
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int value = 0; // the signal strength as an integer
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String result; // the result of the process as a String
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Process wifiCheck; // the process itself
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// Run the script on the linux side. Note that any word
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//or text separated by a tab or space is considered
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//an additional parameter:
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wifiCheck.begin("ash");
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wifiCheck.addParameter("/root/wifiStrength.sh");
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wifiCheck.run();
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// If the process has sent any characters:
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while (wifiCheck.available()>0) {
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result = wifiCheck.readString(); // read the result into a string
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value = result.toInt(); // parse the string as an int
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}
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// for debugging
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Serial.print("previous strength:");
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Serial.print(lastValue);
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Serial.print("\tcurrent strength:");
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Serial.println(value);
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// indicate the relative string by lighting the appropriate LED
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allOff(); // turn off all the LEDS
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if (value > lastValue) { // if the signal's getting stronger
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digitalWrite(10, HIGH);
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}
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else if (value < lastValue){ // if the signal's getting weaker
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digitalWrite(8, HIGH);
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}
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else { // if the signal's stayed steady
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digitalWrite(9, HIGH);
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}
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lastValue = value; // record this value for next time
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delay(10); // small delay before next time through the loop
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}
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void allOff() {
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digitalWrite(8, LOW);
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digitalWrite(9, LOW);
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digitalWrite(10, LOW);
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}
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