Arduino Yún Shell Commands

Copy
1void setup() {
2
3  Bridge.begin();
4
5  Serial.begin(9600);
6
7  while (!Serial);
8}

Copy
1void loop() {
2
3  Process p;

Copy
1while (p.available()) {
2
3    int result = p.parseInt();
4
5    int signal = map(result, 0, 100, 0, 255);
6
7    analogWrite(9, signal);
8
9    Serial.println(result);
10
11  }
12
13  delay(5000);
14}

Copy
1/*
2
3  Running shell commands using Process class.
4
5 This sketch demonstrate how to run linux shell commands
6
7 using a YunShield/Yún. It runs the wifiCheck script on the Linux side
8
9 of the Yún, then uses grep to get just the signal strength line.
10
11 Then it uses parseInt() to read the wifi signal strength as an integer,
12
13 and finally uses that number to fade an LED using analogWrite().
14
15 The circuit:
16
17 * YunShield/Yún with LED connected to pin 9
18
19 created 12 Jun 2013
20
21 by Cristian Maglie
22
23 modified 25 June 2013
24
25 by Tom Igoe
26
27 This example code is in the public domain.
28
29 http://www.arduino.cc/en/Tutorial/ShellCommands
30
31 */
32
33#include <Process.h>
34
35void setup() {
36
37  Bridge.begin();   // Initialize the Bridge
38
39  SerialUSB.begin(9600);    // Initialize the Serial
40
41  // Wait until a Serial Monitor is connected.
42
43  while (!SerialUSB);
44}
45
46void loop() {
47
48  Process p;
49
50  // This command line runs the WifiStatus script, (/usr/bin/pretty-wifi-info.lua), then
51
52  // sends the result to the grep command to look for a line containing the word
53
54  // "Signal:"  the result is passed to this sketch:
55
56  p.runShellCommand("/usr/bin/pretty-wifi-info.lua | grep Signal");
57
58  // do nothing until the process finishes, so you get the whole output:
59
60  while (p.running());
61
62  // Read command output. runShellCommand() should have passed "Signal: xx&":
63
64  while (p.available()) {
65
66    int result = p.parseInt();          // look for an integer
67
68    int signal = map(result, 0, 100, 0, 255);   // map result from 0-100 range to 0-255
69
70    analogWrite(9, signal);         // set the brightness of LED on pin 9
71
72    SerialUSB.println(result);          // print the number as well
73
74  }
75
76  delay(5000);  // wait 5 seconds before you do it again
77}