我试图让一个Android应用程序使用arduino打开或关闭led。
esp8266 esp-01提供接入点。
但我不能使用总是有一些错误
来关闭领导当我在串行监视器中看到数据时，它也是部分乱码
我已从 allaboutee.com/2015/01/20/esp8266-android-application-for-arduino-pin-control /
中获取代码但它被我修改了，因为它在2针和3针上不起作用
我使用过arduino uno。
The circuit diagram is like this
arduino的代码如下：
#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial esp8266(10,11); // make RX Arduino line is pin 2, make TX Arduino line is pin 3.
// This means that you need to connect the TX line from the esp to the Arduino's pin 2
// and the RX line from the esp to the Arduino's pin 3
void setup()
{
Serial.begin(115200);
esp8266.begin(115200); // your esp's baud rate might be different
pinMode(2,OUTPUT);
digitalWrite(2,LOW);
pinMode(3,OUTPUT);
digitalWrite(3,LOW);
pinMode(4,OUTPUT);
digitalWrite(4,LOW);
pinMode(6,OUTPUT);
digitalWrite(6,LOW);
sendCommand("AT+RST\r\n",2000,DEBUG); // reset module
sendCommand("AT+CWMODE=2\r\n",1000,DEBUG); // configure as access point
delay(1000);
sendCommand("AT+CIFSR\r\n",1000,DEBUG); // get ip address
sendCommand("AT+CIPMUX=1\r\n",1000,DEBUG); // configure for multiple connections
sendCommand("AT+CIPSERVER=1,80\r\n",1000,DEBUG); // turn on server on port 80
Serial.println("Server Ready");
}
void loop()
{
if(esp8266.available()) // check if the esp is sending a message
{
if(esp8266.find("+IPD,"))
{
delay(1000); // wait for the serial buffer to fill up (read all the serial data)
// get the connection id so that we can then disconnect
int connectionId = esp8266.read()-48; // subtract 48 because the read() function returns
// the ASCII decimal value and 0 (the first decimal number) starts at 48
esp8266.find("pin="); // advance cursor to "pin="
int pinNumber = (esp8266.read()-48); // get first number i.e. if the pin 13 then the 1st number is 1
int secondNumber = (esp8266.read()-48);
if(secondNumber>=0 && secondNumber<=9)
{
pinNumber*=10;
pinNumber +=secondNumber; // get second number, i.e. if the pin number is 13 then the 2nd number is 3, then add to the first number
}
digitalWrite(pinNumber, !digitalRead(pinNumber)); // toggle pin
// build string that is send back to device that is requesting pin toggle
String content;
content = "Pin ";
content += pinNumber;
content += " is ";
if(digitalRead(pinNumber))
{
content += "ON";
}
else
{
content += "OFF";
}
sendHTTPResponse(connectionId,content);
// make close command
String closeCommand = "AT+CIPCLOSE=";
closeCommand+=connectionId; // append connection id
closeCommand+="\r\n";
sendCommand(closeCommand,1000,DEBUG); // close connection
}
}
}
/*
* Name: sendData
* Description: Function used to send data to ESP8266.
* Params: command - the data/command to send; timeout - the time to wait for a response; debug - print to Serial window?(true = yes, false = no)
* Returns: The response from the esp8266 (if there is a reponse)
*/
String sendData(String command, const int timeout, boolean debug)
{
String response = "";
int dataSize = command.length();
char data[dataSize];
command.toCharArray(data,dataSize);
esp8266.write(data,dataSize); // send the read character to the esp8266
if(debug)
{
Serial.println("\r\n====== HTTP Response From Arduino ======");
Serial.write(data,dataSize);
Serial.println("\r\n========================================");
}
long int time = millis();
while( (time+timeout) > millis())
{
while(esp8266.available())
{
// The esp has data so display its output to the serial window
char c = esp8266.read(); // read the next character.
response+=c;
}
}
if(debug)
{
Serial.print(response);
}
return response;
}
/*
* Name: sendHTTPResponse
* Description: Function that sends HTTP 200, HTML UTF-8 response
*/
void sendHTTPResponse(int connectionId, String content)
{
// build HTTP response
String httpResponse;
String httpHeader;
// HTTP Header
httpHeader = "HTTP/1.1 200 OK\r\nContent-Type: text/html; charset=UTF-8\r\n";
httpHeader += "Content-Length: ";
httpHeader += content.length();
httpHeader += "\r\n";
httpHeader +="Connection: close\r\n\r\n";
httpResponse = httpHeader + content; // There is a bug in this code: the last character of "content" is not sent, I cheated by adding this extra space
sendCIPData(connectionId,httpResponse);
}
/*
* Name: sendCIPDATA
* Description: sends a CIPSEND=<connectionId>,<data> command
*
*/
void sendCIPData(int connectionId, String data)
{
String cipSend = "AT+CIPSEND=";
cipSend += connectionId;
cipSend += ",";
cipSend +=data.length();
cipSend +="\r\n";
sendCommand(cipSend,1000,DEBUG);
sendData(data,1000,DEBUG);
}
/*
* Name: sendCommand
* Description: Function used to send data to ESP8266.
* Params: command - the data/command to send; timeout - the time to wait for a response; debug - print to Serial window?(true = yes, false = no)
* Returns: The response from the esp8266 (if there is a reponse)
*/
String sendCommand(String command, const int timeout, boolean debug)
{
String response = "";
esp8266.print(command); // send the read character to the esp8266
long int time = millis();
while( (time+timeout) > millis())
{
while(esp8266.available())
{
// The esp has data so display its output to the serial window
char c = esp8266.read(); // read the next character.
response+=c;
}
}
if(debug)
{
Serial.print(response);
}
return response;
}
android的代码如下：
Mainactivity：
package com.example.autohome;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
public class MainActivity extends Activity implements View.OnClickListener {
public final static String PREF_IP = "PREF_IP_ADDRESS";
public final static String PREF_PORT = "PREF_PORT_NUMBER";
// declare buttons and text inputs
private Button buttonPin11,buttonPin12,buttonPin13;
private EditText editTextIPAddress, editTextPortNumber;
// shared preferences objects used to save the IP address and port so that the user doesn't have to
// type them next time he/she opens the app.
SharedPreferences.Editor editor;
SharedPreferences sharedPreferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sharedPreferences = getSharedPreferences("HTTP_HELPER_PREFS",Context.MODE_PRIVATE);
editor = sharedPreferences.edit();
// assign buttons
buttonPin11 = (Button)findViewById(R.id.buttonPin11);
buttonPin12 = (Button)findViewById(R.id.buttonPin12);
buttonPin13 = (Button)findViewById(R.id.buttonPin13);
// assign text inputs
editTextIPAddress = (EditText)findViewById(R.id.editTextIPAddress);
editTextPortNumber = (EditText)findViewById(R.id.editTextPortNumber);
// set button listener (this class)
buttonPin11.setOnClickListener(this);
buttonPin12.setOnClickListener(this);
buttonPin13.setOnClickListener(this);
// get the IP address and port number from the last time the user used the app,
// put an empty string "" is this is the first time.
editTextIPAddress.setText(sharedPreferences.getString(PREF_IP,""));
editTextPortNumber.setText(sharedPreferences.getString(PREF_PORT,""));
}
@Override
public void onClick(View view) {
// get the pin number
String parameterValue = "";
// get the ip address
String ipAddress = editTextIPAddress.getText().toString().trim();
// get the port number
String portNumber = editTextPortNumber.getText().toString().trim();
// save the IP address and port for the next time the app is used
editor.putString(PREF_IP,ipAddress); // set the ip address value to save
editor.putString(PREF_PORT,portNumber); // set the port number to save
editor.commit(); // save the IP and PORT
// get the pin number from the button that was clicked
if(view.getId()==buttonPin11.getId())
{
parameterValue = "2";
}
else if(view.getId()==buttonPin12.getId())
{
parameterValue = "3";
}
else
{
parameterValue = "4";
}
// execute HTTP request
if(ipAddress.length()>0 && portNumber.length()>0) {
new HttpRequestAsyncTask(
view.getContext(), parameterValue, ipAddress, portNumber, "pin"
).execute();
}
}
/**
* Description: Send an HTTP Get request to a specified ip address and port.
* Also send a parameter "parameterName" with the value of "parameterValue".
* @param parameterValue the pin number to toggle
* @param ipAddress the ip address to send the request to
* @param portNumber the port number of the ip address
* @param parameterName
* @return The ip address' reply text, or an ERROR message is it fails to receive one
*/
public String sendRequest(String parameterValue, String ipAddress, String portNumber, String parameterName) {
String serverResponse = "ERROR";
try {
HttpClient httpclient = new DefaultHttpClient(); // create an HTTP client
// define the URL e.g. http://myIpaddress:myport/?pin=13 (to toggle pin 13 for example)
URI website = new URI("http://"+ipAddress+":"+portNumber+"/?"+parameterName+"="+parameterValue);
HttpGet getRequest = new HttpGet(); // create an HTTP GET object
getRequest.setURI(website); // set the URL of the GET request
HttpResponse response = httpclient.execute(getRequest); // execute the request
// get the ip address server's reply
InputStream content = null;
content = response.getEntity().getContent();
BufferedReader in = new BufferedReader(new InputStreamReader(
content
));
serverResponse = in.readLine();
// Close the connection
content.close();
} catch (ClientProtocolException e) {
// HTTP error
serverResponse = e.getMessage();
e.printStackTrace();
} catch (IOException e) {
// IO error
serverResponse = e.getMessage();
e.printStackTrace();
} catch (URISyntaxException e) {
// URL syntax error
serverResponse = e.getMessage();
e.printStackTrace();
}
// return the server's reply/response text
return serverResponse;
}
/**
* An AsyncTask is needed to execute HTTP requests in the background so that they do not
* block the user interface.
*/
private class HttpRequestAsyncTask extends AsyncTask<Void, Void, Void> {
// declare variables needed
private String requestReply,ipAddress, portNumber;
private Context context;
private AlertDialog alertDialog;
private String parameter;
private String parameterValue;
/**
* Description: The asyncTask class constructor. Assigns the values used in its other methods.
* @param context the application context, needed to create the dialog
* @param parameterValue the pin number to toggle
* @param ipAddress the ip address to send the request to
* @param portNumber the port number of the ip address
*/
public HttpRequestAsyncTask(Context context, String parameterValue, String ipAddress, String portNumber, String parameter)
{
this.context = context;
alertDialog = new AlertDialog.Builder(this.context)
.setTitle("HTTP Response From IP Address:")
.setCancelable(true)
.create();
this.ipAddress = ipAddress;
this.parameterValue = parameterValue;
this.portNumber = portNumber;
this.parameter = parameter;
}
/**
* Name: doInBackground
* Description: Sends the request to the ip address
* @param voids
* @return
*/
@Override
protected Void doInBackground(Void... voids) {
alertDialog.setMessage("Data sent, waiting for reply from server...");
if(!alertDialog.isShowing())
{
alertDialog.show();
}
requestReply = sendRequest(parameterValue,ipAddress,portNumber, parameter);
return null;
}
/**
* Name: onPostExecute
* Description: This function is executed after the HTTP request returns from the ip address.
* The function sets the dialog's message with the reply text from the server and display the dialog
* if it's not displayed already (in case it was closed by accident);
* @param aVoid void parameter
*/
@Override
protected void onPostExecute(Void aVoid) {
alertDialog.setMessage(requestReply);
if(!alertDialog.isShowing())
{
alertDialog.show(); // show dialog
}
}
/**
* Name: onPreExecute
* Description: This function is executed before the HTTP request is sent to ip address.
* The function will set the dialog's message and display the dialog.
*/
@Override
protected void onPreExecute() {
alertDialog.setMessage("Sending data to server, please wait...");
if(!alertDialog.isShowing())
{
alertDialog.show();
}
}
}
}
布局文件：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="IP Address:"
android:id="@+id/textView" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="e.g. 192.168.0.10"
android:id="@+id/editTextIPAddress" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Port Number:"
android:id="@+id/textView2" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:hint="e.g. 80"
android:id="@+id/editTextPortNumber" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Pin 11"
android:id="@+id/buttonPin11" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Pin 12"
android:id="@+id/buttonPin12" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Pin 13"
android:id="@+id/buttonPin13" />
</LinearLayout>
</ScrollView>
These are the serial monitor images.
当响应不是胡言乱语时，该程序可行。当它的胡言乱语出现问题时
如果帖子缺少任何信息，请原谅我。 我也为帖子中的任何错误道歉，因为这是我的第一次
答案 0 :(得分：0)
由于Arduino无法为ESP8266提供足够的电流，尤其是在发送/接收数据时，你会感到胡言乱语。 ESP8266模块可以尝试吸收大约 320mA 的峰值电流，而Arduino 3.3V稳压输出的额定电流高达 50mA ，因此您必须使用外部电源。 / p>
答案 1 :(得分：0)
使用ESP8266对库存固件进行的矿井实验让我觉得通信波特率115200工作不稳定。试试57600，这绝对有效。
