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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);
+}
+
+
+
+
+
+