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In a previous post, we showed how to install jsp web server on pcDuino. In this project, we will use GPIO to control lamp through a web browser.
[/vc_column_text][vc_tour][vc_tab title=”Parts List” tab_id=”1394864346-1-100″][vc_column_text]1. 1 x pcDuino v2
Install jsp web server on the pcDuino.
We also need couple of jumper wires and a LED.[/vc_column_text][/vc_tab][vc_tab title=”Test result” tab_id=”1394864346-2-83″][vc_column_text]When we set the GPIO pin connected to the LED as high level, the LED will turn on.
When we set the GPIO pin connected to the LED as low level, the LED will turn off.
[/vc_column_text][/vc_tab][vc_tab title=”Test code” tab_id=”1394864950198-2-7″][vc_column_text]
<%@ page session="false" import="java.io.*"%><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";//response.sendRedirect(path+"ocloudmanager"); class GPIO_Pin { private String modeURI = "/sys/devices/virtual/misc/gpio/mode/"; private String statusURI = "/sys/devices/virtual/misc/gpio/pin/"; private int pin = 0; public static final String HIGH = "1", LOW = "0", INPUT = "0", OUTPUT = "1", INPUT_PU = "8"; //定义常量 public GPIO_Pin(int pin) { //实例化GPIO对象 modeURI += "gpio" + pin; statusURI += "gpio" + pin; this.pin = pin; } public GPIO_Pin(String pin) { //实例化GPIO对象 modeURI += "gpio" + pin; statusURI += "gpio" + pin; this.pin =Integer.parseInt(pin); } public int getPin() { //获得当前GPIO对象的pin脚 return pin; } public void overrideURI(String uri) { modeURI = uri + "mode/gpio" + pin; statusURI = uri + "pin/gpio" + pin; } public void setMode(String mode) { //设置pin控制器脚状态 writeToFile(getModeURI(), mode); } public void set(String state) { //设置pin脚状态 writeToFile(getStatusURI(), state); } public void setHIGH() { //set pin as high level writeToFile(getStatusURI(), HIGH); } public void setLOW() { //set pin as low level writeToFile(getStatusURI(), LOW); } public void setModeINPUT() { writeToFile(getModeURI(), INPUT); } public void setModeOUTPUT() { writeToFile(getModeURI(), OUTPUT); } public void setModeINPUT_PU() { writeToFile(getModeURI(), INPUT_PU); } public String getModeURI() { return modeURI; } public String getStatusURI() { return statusURI; } public String getPinMode() { try { BufferedReader reader = new BufferedReader(new FileReader(getModeURI())); String data = reader.readLine(); reader.close(); return data; } catch (IOException e) { } return ""; } public String getPinStatus() { try { BufferedReader reader = new BufferedReader(new FileReader(getStatusURI())); String data = reader.readLine(); reader.close(); return data; } catch (IOException e) { } return ""; } private void writeToFile(String URI, String data) { try { File file = new File(URI); file.delete(); File newFile = new File(URI); newFile.createNewFile(); FileWriter writer = new FileWriter(URI); writer.write(data); writer.close(); } catch (IOException e) { e.printStackTrace(); } }}String pin=request.getParameter("pin");String mode=request.getParameter("mode");String state=request.getParameter("state");GPIO_Pin gpio=null;if(pin!=null){ gpio=new GPIO_Pin(pin); if("1".equals(mode)){ gpio.setModeOUTPUT(); if("1".equals(state)) gpio.setHIGH(); else if("0".equals(state)){ gpio.setLOW(); } }else if("0".equals(mode)){ gpio.setModeINPUT(); state=gpio.getPinStatus(); out.println(" <script type="text/javascript"> alert(""+("1".equals(state)?"set high level":"set low level")+""); </script>"); }}%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>first page </title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <table> <tr> <td>pin</td> <td>1</td> <td>2</td> <td>3</td> <td>4</td> <td>5</td> <td>6</td> <td>7</td> <td>8</td> <td>9</td> <td>10</td> <td>11</td> <td>12</td> <td>13</td> </tr> <tr> <td>set high level</td> <td><a href="?mode=1&pin=1&state=1">set high level</a></td> <td><a href="?mode=1&pin=2&state=1">set high level</a></td> <td><a href="?mode=1&pin=3&state=1">set high level</a></td> <td><a href="?mode=1&pin=4&state=1">set high level</a></td> <td><a href="?mode=1&pin=5&state=1">set high level</a></td> <td><a href="?mode=1&pin=6&state=1">set high level</a></td> <td><a href="?mode=1&pin=7&state=1">set high level</a></td> <td><a href="?mode=1&pin=8&state=1">set high level</a></td> <td><a href="?mode=1&pin=9&state=1">set high level</a></td> <td><a href="?mode=1&pin=10&state=1">set high level</a></td> <td><a href="?mode=1&pin=11&state=1">set high level</a></td> <td><a href="?mode=1&pin=12&state=1">set high level</a></td> <td><a href="?mode=1&pin=13&state=1">set high level</a></td> </tr> <tr> <td>set low level</td> <td><a href="?mode=1&pin=1&state=0">set low level</a></td> <td><a href="?mode=1&pin=2&state=0">set low level</a></td> <td><a href="?mode=1&pin=3&state=0">set low level</a></td> <td><a href="?mode=1&pin=4&state=0">set low level</a></td> <td><a href="?mode=1&pin=5&state=0">set low level</a></td> <td><a href="?mode=1&pin=6&state=0">set low level</a></td> <td><a href="?mode=1&pin=7&state=0">set low level</a></td> <td><a href="?mode=1&pin=8&state=0">set low level</a></td> <td><a href="?mode=1&pin=9&state=0">set low level</a></td> <td><a href="?mode=1&pin=10&state=0">set low level</a></td> <td><a href="?mode=1&pin=11&state=0">set low level</a></td> <td><a href="?mode=1&pin=12&state=0">set low level</a></td> <td><a href="?mode=1&pin=13&state=0">set low level</a></td> </tr> <tr> <td>read pin state</td> <td><a href="?mode=0&pin=1&state=0">read pin state</a></td> <td><a href="?mode=0&pin=2&state=0">read pin state</a></td> <td><a href="?mode=0&pin=3&state=0">read pin state</a></td> <td><a href="?mode=0&pin=4&state=0">read pin state</a></td> <td><a href="?mode=0&pin=5&state=0">read pin state</a></td> <td><a href="?mode=0&pin=6&state=0">read pin state</a></td> <td><a href="?mode=0&pin=7&state=0">read pin state</a></td> <td><a href="?mode=0&pin=8&state=0">read pin state</a></td> <td><a href="?mode=0&pin=9&state=0">read pin state</a></td> <td><a href="?mode=0&pin=10&state=0">read pin state</a></td> <td><a href="?mode=0&pin=11&state=0">read pin state</a></td> <td><a href="?mode=0&pin=12&state=0">read pin state</a></td> <td><a href="?mode=0&pin=13&state=0">read pin state</a></td> </tr> </table> </body></html>[/vc_column_text][/vc_tab][/vc_tour][/vc_column][/vc_row]
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