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-/*
- Wifi Signal Strength Indicator
-
- This example demonstrates the use of the bridge and process libraries
- to communicate between the Arduino side and the linux side of the Arduino Yun.
-
- The Linux script returns the strength of the wifi signal.
-
- The Arduino sketch uses LEDs to indicate whether the current value of
- the signal strength is above, below, or the same as the last value
-
- The circuit:
- * LEDs on pins 8, 9, and 10
- * Built-in LED on pin 13
-
- The script:
- The following one line script must exist in the /root directory of the
- linux file system, in a file named "wifiStrength.sh", and it must be executable:
-
- tail -1 /proc/net/wireless | cut -c22-23
-
- created 06 June 2013
- by Michael Shiloh
- modified 08 June 2013
- by Tom Igoe
-
- This example code is in the public domain
-
- */
-
-
-#include <Process.h>
-
-// global variable to store the last value of the signal strength
-int lastValue;
-
-void setup() {
- // set up LED pins as outputs:
- pinMode(8, OUTPUT);
- pinMode(9, OUTPUT);
- pinMode(10, OUTPUT);
- pinMode(13,OUTPUT);
-
- // Indicate that you're ready by flashing pin 13 LED twice
- for (int flash = 0; flash < 3; flash++) {
- digitalWrite(13,HIGH);
- delay(200);
- digitalWrite(13,LOW);
- delay(800);
- }
- // initialize Serial and Bridge:
- Serial.begin(9600);
- Bridge.begin();
-
- // Indicate that setup is finished
- digitalWrite(13,HIGH);
-}
-
-void loop() {
- int value = 0; // the signal strength as an integer
- String result; // the result of the process as a String
- Process wifiCheck; // the process itself
-
-
- // Run the script on the linux side. Note that any word
- //or text separated by a tab or space is considered
- //an additional parameter:
- wifiCheck.begin("ash");
- wifiCheck.addParameter("/root/wifiStrength.sh");
- wifiCheck.run();
-
- // If the process has sent any characters:
- while (wifiCheck.available()>0) {
- result = wifiCheck.readString(); // read the result into a string
- value = result.toInt(); // parse the string as an int
- }
-
- // for debugging
- Serial.print("previous strength:");
- Serial.print(lastValue);
- Serial.print("\tcurrent strength:");
- Serial.println(value);
-
- // indicate the relative string by lighting the appropriate LED
- allOff(); // turn off all the LEDS
-
- if (value > lastValue) { // if the signal's getting stronger
- digitalWrite(10, HIGH);
- }
- else if (value < lastValue){ // if the signal's getting weaker
- digitalWrite(8, HIGH);
- }
- else { // if the signal's stayed steady
- digitalWrite(9, HIGH);
- }
-
- lastValue = value; // record this value for next time
- delay(10); // small delay before next time through the loop
-}
-
-
-void allOff() {
- digitalWrite(8, LOW);
- digitalWrite(9, LOW);
- digitalWrite(10, LOW);
-}
-
-
-
-
-
-