esp8266远程控制教程（自制wifi遥控小车ESP8266实践指南）

上次带大家利用ESP8266自制了wifi控制的LED点阵屏幕，大家觉得怎么样呢？ 手把手教你用wifi控制显示屏！ESP8266实践指南（一）

今天我们来做点更有意思的~ wifi遥控小车！

• ESP8266 NodeMCU开发板：这次我们使用CP2102芯片的那款NodeMCU，优点是体积更小一点，更适合小车这种体积受限的场景。
• L9110电机控制模块
• 面包板：方便接线
• 两轮小车底盘套装，包含：塑料底盘，电机x2, 轮子x2，万向轮，5号电池盒
• 公对公杜邦线若干
• 5号电池4节
• 手机移动电源一个

先按照说明书把小车底盘套装组装起来：

然后将ESP8266，L9110固定在面包板上，并按照线路图连接：

实际接线效果大致如图：

固定电池盒和充电宝：

4节串联的5号电池用于给L9110供电，而充电宝用于通过usb接口给NodeMCU开发板供电。

一开始，我尝试了直接使用充电宝给NodeMCU开发板供电，然后L9110的VCC接NodeMCU的VIN，GND接NodeMCU的GND来供电。这样的话，简单便捷，不需要两套供电。但是不幸的是，动力电路走开发板的VIN确实会有问题：在电机运转一会儿后，开发板会重启。

于是后来我还是用上了电池盒，用电池盒给L9110供电，正负极分别接VCC, GND就可以了。

在连接好开发板，电机，电源之后，摆放好各个部件，用双面胶固定到位即可。有条件的话，电机的正负电源线建议使用电烙铁和焊锡固定好，防止震动导致松动。

有关ESP8266的开发环境配置在这里不在赘述，之前没有设置的朋友看这里~ 很简单哦~

十块钱入门物联网！ESP8266新手指南

将以下代码复制到Arduino IDE:

// Simple WiFi-controlled car on NodeMCU and L9110 motor drive board // OrangeZero 零度橙子@头条 // source code modified from Alan Wang@hackster.io #include <ESP8266WiFi.h> #include <ESP8266WebServer.h> // WiFi settings #define WIFI_MODE 1 // 1: AP模式，NodeMCU自身起一个wifi信号；2：SA模式，NodeMCU连上一个已有wifi。推荐使用AP模式 #define SSID_AP "NodeMCU_WiFi_Car" // for AP mode #define PASSWORD_AP "12345678" // for AP mode #define SSID_STA "your_wifi_ssid" // for STA mode #define PASSWORD_STA "your_wifi_password" // for STA mode // motor settings #define RIGHT_MOTOR_PIN1 4 // pin 1 of right motor (D2) #define RIGHT_MOTOR_PIN2 5 // pin 2 of right motor (D1) #define LEFT_MOTOR_PIN1 12 // pin 1 of left motor (D6) #define LEFT_MOTOR_PIN2 14 // pin 2 of left motor (D5) #define MOTOR_SPEED 1200 // speed for motor IPAddress local_ip(192, 168, 1, 1); //IP for AP mode IPAddress gateway(192, 168, 1, 1); //IP for AP mode IPAddress subnet(255, 255, 255, 0); //IP for AP mode ESP8266WebServer server(80); int car_mode = 0; // set car drive mode (0 = stop) // initialize void setup() { Serial.begin(9600); Serial.println("NodeMCU Wifi Car"); pinMode(RIGHT_MOTOR_PIN1, OUTPUT); pinMode(RIGHT_MOTOR_PIN2, OUTPUT); pinMode(LEFT_MOTOR_PIN1, OUTPUT); pinMode(LEFT_MOTOR_PIN2, OUTPUT); car_control(); // stop the car if (WIFI_MODE == 1) { // AP mode WiFi.softAP(SSID_AP, PASSWORD_AP); WiFi.softAPConfig(local_ip, gateway, subnet); } else { // STA mode WiFi.begin(SSID_STA, PASSWORD_STA); Serial.print("Connecting to WiFi..."); while (WiFi.status() != WL_CONNECTED) { delay(100); Serial.print("."); } Serial.println(""); Serial.print("Connected! IP: "); Serial.println(WiFi.localIP()); //the IP is needed for connection in STA mode } // setup web server to handle specific HTTP requests server.on("/", HTTP_GET, handle_OnConnect); server.on("/forward", HTTP_GET, handle_forward); server.on("/backward", HTTP_GET, handle_backward); server.on("/left", HTTP_GET, handle_left); server.on("/right", HTTP_GET, handle_right); server.on("/stop", HTTP_GET, handle_stop); server.onNotFound(handle_NotFound); //start server server.begin(); Serial.println("NodeMCU web server started."); } // handle HTTP requests and control car void loop() { server.handleClient(); car_control(); } // HTTP request: on connect void handle_OnConnect() { car_mode = 0; Serial.println("Client connected"); server.send(200, "text/html", SendHTML()); } // HTTP request: stop car void handle_stop() { car_mode = 0; Serial.println("Stopped"); server.send(200, "text/html", SendHTML()); } // HTTP request: go forward void handle_forward() { car_mode = 1; Serial.println("Go forward..."); server.send(200, "text/html", SendHTML()); } // HTTP request: go backward void handle_backward() { car_mode = 2; Serial.println("Go backward..."); server.send(200, "text/html", SendHTML()); } // HTTP request: turn left void handle_left() { car_mode = 3; Serial.println("Turn left..."); server.send(200, "text/html", SendHTML()); } // HTTP request: turn right void handle_right() { car_mode = 4; Serial.println("Turn right..."); server.send(200, "text/html", SendHTML()); } // HTTP request: other void handle_NotFound() { car_mode = 0; Serial.println("Page error"); server.send(404, "text/plain", "Not found"); } // control car movement void car_control() { switch (car_mode) { case 0: // stop car digitalWrite(RIGHT_MOTOR_PIN1, LOW); digitalWrite(RIGHT_MOTOR_PIN2, LOW); digitalWrite(LEFT_MOTOR_PIN1, LOW); digitalWrite(LEFT_MOTOR_PIN2, LOW); break; case 1: // go forward analogWrite(RIGHT_MOTOR_PIN1, MOTOR_SPEED); digitalWrite(RIGHT_MOTOR_PIN2, LOW); analogWrite(LEFT_MOTOR_PIN1, MOTOR_SPEED); digitalWrite(LEFT_MOTOR_PIN2, LOW); break; case 2: // go backward digitalWrite(RIGHT_MOTOR_PIN1, LOW); analogWrite(RIGHT_MOTOR_PIN2, MOTOR_SPEED); digitalWrite(LEFT_MOTOR_PIN1, LOW); analogWrite(LEFT_MOTOR_PIN2, MOTOR_SPEED); break; case 3: // turn left analogWrite(RIGHT_MOTOR_PIN1, MOTOR_SPEED); digitalWrite(RIGHT_MOTOR_PIN2, LOW); digitalWrite(LEFT_MOTOR_PIN1, LOW); analogWrite(LEFT_MOTOR_PIN2, MOTOR_SPEED); break; case 4: // turn right digitalWrite(RIGHT_MOTOR_PIN1, LOW); analogWrite(RIGHT_MOTOR_PIN2, MOTOR_SPEED); analogWrite(LEFT_MOTOR_PIN1, MOTOR_SPEED); digitalWrite(LEFT_MOTOR_PIN2, LOW); } } // output HTML web page for user String SendHTML() { String html = "<!DOCTYPE html>\n" "<html>\n" "<head>\n" "<title>NodeMCU Wifi Car by OrangeZero</title>\n" "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n" "</head>\n" "<body>\n" "<div align=\"center\">\n" "<h1>NodeMCU Wifi Car by OrangeZero</h1>\n" "<br>\n" "<form method=\"GET\">\n" "<input type=\"button\" value=\"Go forward\" onclick=\"window.location.href='/forward'\">\n" "<br><br>\n" "<input type=\"button\" value=\"Go backward\" onclick=\"window.location.href='/backward'\">\n" "<br><br>\n" "<input type=\"button\" value=\"Turn left\" onclick=\"window.location.href='/left'\">\n" "<br><br>\n" "<input type=\"button\" value=\"Turn right\" onclick=\"window.location.href='/right'\">\n" "<br><br>\n" "<input type=\"button\" value=\"Car stop\" onclick=\"window.location.href='/stop'\">\n" "</form>\n" "</div>\n" "<a href='https://profile.zjurl.cn/rogue/ugc/profile/?user_id=4182130004597211'>Copyright 2020 OrangeZero</a>" "</body>\n" "</html>\n"; return html; }

点击上传按钮，稍等片刻，等待上传完成：

到这里我们的小车就制作完成了！让我们来发动小车吧~

在打开移动电源的开关，连接好电池盒的正负极之后，稍等片刻，我们就可以搜索到wifi信号：

NodeMCU WiFi Car

手机连接wifi之后，在浏览器中打开：192.168.1.1

点击相关按钮就可以操纵小车前进，后退，转向，还有停止了~

大家有没有觉得并没有那么难，而且成就感满满的呢~

大家有什么还有什么想要做的物联网或者智能家居项目呢？在下面留言告诉我吧~

我是零度橙子，装机爱好者，科技达人，谷歌认证云计算架构师，大家可以关注我，了解有用有趣的科技知识～