Arduino设计 有害气体检测小车

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有害气体检测小车

从代码已经可以看得出电路应该怎么接了, 具体电路就不放上来了

Arduino控制部分代码

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 16, 2);
#define RightGo 6
#define RightBack 7
#define LeftGo 5
#define LeftBack 4
#define LEFT '3'
#define RIGHT '4'
#define GO '1'
#define BACK '2'
#define STOP '0'
#define mq2 A0
#define buzzPin 3
#define ledPin 2

void setup() {
    Serial.begin(9600);
    pinMode(RightGo, OUTPUT);
    pinMode(RightBack, OUTPUT);
    pinMode(LeftGo, OUTPUT);
    pinMode(LeftBack, OUTPUT);
    pinMode(ledPin, OUTPUT);
    initCar();
    lcd.init();
    lcd.backlight();
    lcd.setCursor(0, 0);
    lcd.print("Initializing");
}

void loop() {
    lcd.setCursor(0, 0);
    lcd.print("Group 3:      ");
    lcd.setCursor(4, 1);
    lcd.print("Gas:");
    lcd.print(map(analogRead(mq2), 0, 1023, 0, 100));
    lcd.print("%  ");
    if (analogRead(mq2) > 200) {
        digitalWrite(buzzPin, HIGH);
        digitalWrite(ledPin, HIGH);
        delay(500);
        digitalWrite(buzzPin, LOW);
        digitalWrite(ledPin, LOW);
    }
    Serial.print("Gas:");
    Serial.println(map(analogRead(mq2), 0, 1023, 0, 100));
    Serial.print("%");
    if(Serial.available() > 0) {
        char ch = Serial.read();
        if(ch == GO)
            go();
        else if(ch == BACK)
            back();
        else if(ch == LEFT)
            turnLeft();
        else if(ch == RIGHT)
            turnRight();
        else if(ch == STOP)
            stopCar();
    }
    delay(500);
}

void initCar() {
    digitalWrite(RightGo, LOW);
    digitalWrite(RightBack, LOW);
    digitalWrite(LeftGo, LOW);
    digitalWrite(LeftBack, LOW);
}

void turnLeft() {
    digitalWrite(RightGo, HIGH);
    digitalWrite(RightBack, LOW);
    digitalWrite(LeftGo, LOW);
    digitalWrite(LeftBack, LOW);
}

void turnRight() {
    digitalWrite(RightGo, LOW);
    digitalWrite(RightBack, LOW);
    digitalWrite(LeftGo, HIGH);
    digitalWrite(LeftBack, LOW);
}

void go() {
    digitalWrite(RightGo, HIGH);
    digitalWrite(RightBack, LOW);
    digitalWrite(LeftGo, HIGH);
    digitalWrite(LeftBack, LOW);
}

void back() {
    digitalWrite(RightGo, LOW);
    digitalWrite(RightBack, HIGH);
    digitalWrite(LeftGo, LOW);
    digitalWrite(LeftBack, HIGH);
}

void stopCar() {
    initCar();
}