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！

一、所需材料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

二、组装小车

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。

三、上传代码

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 motorIPAddress local_ip(192, 168, 1, 1); //IP for AP modeIPAddress gateway(192, 168, 1, 1); //IP for AP modeIPAddress subnet(255, 255, 255, 0); //IP for AP modeESP8266WebServer server(80);int car_mode = 0; // set car drive mode (0 = stop)// initializevoid 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 carvoid loop() {   server.handleClient();  car_control();}// HTTP request: on connectvoid handle_OnConnect() {  car_mode = 0;  Serial.println("Client connected");  server.send(200, "text/html", SendHTML());}// HTTP request: stop carvoid handle_stop() {  car_mode = 0;  Serial.println("Stopped");  server.send(200, "text/html", SendHTML());}// HTTP request: go forwardvoid handle_forward() {  car_mode = 1;  Serial.println("Go forward...");  server.send(200, "text/html", SendHTML());}// HTTP request: go backwardvoid handle_backward() {  car_mode = 2;  Serial.println("Go backward...");  server.send(200, "text/html", SendHTML());}// HTTP request: turn leftvoid handle_left() {  car_mode = 3;  Serial.println("Turn left...");  server.send(200, "text/html", SendHTML());}// HTTP request: turn rightvoid handle_right() {  car_mode = 4;  Serial.println("Turn right...");  server.send(200, "text/html", SendHTML());}// HTTP request: othervoid handle_NotFound() {  car_mode = 0;  Serial.println("Page error");  server.send(404, "text/plain", "Not found");}// control car movementvoid 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 userString 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=';>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：

四、开动小车！

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～