我的Arduino代码有问题，我想使用软件串行库在ESP8266-01和Arduino UNO R3之间进行通信。
这是我使用的代码
ESP8266-01作为发送器
#include <ESP8266WiFi.h>
// Replace with your network credentials
const char* ssid = "farzain_2";
const char* password = "1999fzyc";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Auxiliar variables to store the current output state
String output5State = "off";
String output4State = "off";
// Assign output variables to GPIO pins
void setup() {
Serial.begin(9600);
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// Print local IP address and start web server
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
//Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// turns the GPIOs on and off
if (header.indexOf("GET /5/on") >= 0) {
Serial.println("GPIO 5 on");
output5State = "on";
Serial.write("LED 1 ON");
} else if (header.indexOf("GET /5/off") >= 0) {
Serial.println("GPIO 5 off");
output5State = "off";
Serial.write("LED 2 OFF");
} else if (header.indexOf("GET /4/on") >= 0) {
Serial.println("GPIO 4 on");
output4State = "on";
Serial.write("LED 2 ON");
} else if (header.indexOf("GET /4/off") >= 0) {
Serial.println("GPIO 4 off");
output4State = "off";
Serial.write("LED 2 OFF");
}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #77878A;}</style></head>");
// Web Page Heading
client.println("<body><h1>ESP8266 Web Server</h1>");
// Display current state, and ON/OFF buttons for GPIO 5
client.println("<p>GPIO 5 - State " + output5State + "</p>");
// If the output5State is off, it displays the ON button
if (output5State=="off") {
client.println("<p><a href=\"/5/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/5/off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 4
client.println("<p>GPIO 4 - State " + output4State + "</p>");
// If the output4State is off, it displays the ON button
if (output4State=="off") {
client.println("<p><a href=\"/4/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/4/off\"><button class=\"button button2\">OFF</button></a></p>");
}
client.println("</body></html>");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}
Arduino UNO作为接收器
#include <SoftwareSerial.h>
SoftwareSerial mySerial(2,3); //RX, TX
const int LED_ONE = 6;
const int LED_TWO = 7;
void setup(){
Serial.begin(9600);
mySerial.begin(9600);
pinMode(LED_ONE, OUTPUT);
pinMode(LED_TWO, OUTPUT);
}
void loop(){
String IncomingString = "";
boolean StringReady = false;
while(mySerial.available()){
IncomingString = mySerial.readString();
StringReady = true;
}
if(StringReady) {
Serial.print("From ESP = ");
Serial.println(IncomingString);
if(IncomingString = "LED 1 ON") {
Serial.println("");
Serial.println("LED 1 ON");
Serial.println("");
digitalWrite(LED_ONE, HIGH);
}
if(IncomingString = "LED 1 OFF") {
Serial.println("");
Serial.println("LED 1 OFF");
Serial.println("");
digitalWrite(LED_ONE, LOW);
}
if(IncomingString = "LED 2 ON") {
Serial.println("");
Serial.println("LED 2 ON");
Serial.println("");
digitalWrite(LED_TWO, HIGH);
}
if(IncomingString = "LED 2 OFF") {
Serial.println("LED 2 OFF");
Serial.println("");
digitalWrite(LED_TWO, LOW);
}
}
}
我对该软件串行库的了解是，接收方仅会使用代码ESP8267-01（Transmitter）中的Serial.write从发送方接收消息。 但是事实证明，有很多发送到Arduino Uno的消息没有使用serial.write，这是串行监视器的结果
来自ESP =新客户。
LED 1点亮
LED 1熄灭
LED 2点亮
LED 2熄灭
从ESP =客户端已断开连接。
LED 1点亮
LED 1熄灭
LED 2点亮
LED 2熄灭
我上面的代码有问题吗？谢谢
答案 0 :(得分：0)
if(IncomingString = "LED 1 ON")
...将文本分配给变量并返回true，因为它不是NULL
您可能想将字符串与文字进行比较。使用==代替：）