Question

我正在尝试使用3个或更多Arduino Uno和1个Mega（作为主设备）来构建电梯。

Arduino Uno（从站）：

我已将红外传感器，按钮，LED和7段显示器连接到Uno。

如果我按下按钮，LED将会点亮并保持点亮状态，直到红外传感器检测到电梯轿厢为止。然后，LED指示灯将熄灭，并且7段显示器将显示楼层编号。

Arduino Mega（Master）：

主机用于步进电机和键盘。

主站要做的是询问从站（在这种情况下是Uno的）关于是否按下了按钮。

示例场景：

笼子位于2楼，由IR传感器检测到。如果我按下2楼的按钮，那么Mega必须知道笼子已经在那了。如果我按下3楼的按钮，Mega必须知道笼子在2楼并且按下3楼的按钮，并且它必须控制马达将笼子带到3楼并显示在7段显示器上

我必须使用i2c。

很抱歉，我很难理解文字内容。我的英语不好。

这是奴隶代码：

#include<arduino.h>

const int dataPin = 11;  //  wire to 74HC595 pin 11
const int latchPin = 8; //  to 74HC595 pin 8
const int clockPin = 12; //  to 74HC595 pin 12

int nummers[6] = {126, 12, 182, 158, 204, 204}; //0, 1, 2, 3, 4, 5

int buttonvalue = 0;
int button = 2;
int buttonLed = 3;

// ir  sensor and irleds
int irLedGreen = 5;
int irLedRed = 6;
#define IR 4
int detect = 0;

void setup() {
    Serial.begin(9600);   

    //ir sensor
    pinMode(irLedGreen, OUTPUT);
    pinMode(IR, INPUT);
    pinMode(irLedRed, OUTPUT);

    //shift out
    pinMode(dataPin, OUTPUT);
    pinMode(latchPin, OUTPUT);
    pinMode(clockPin, OUTPUT);

    //button
    pinMode(button, INPUT);
    pinMode(buttonLed, OUTPUT);
}

void loop(){

    buttonvalue = digitalRead(button);
    detect = digitalRead(IR);

    // ir sensor led. It will be green if it detects something else it will be red.
    if (detect == LOW) { // if if detects something do the following.
        digitalWrite(irLedGreen, HIGH);
        digitalWrite(irLedRed, LOW);
    } else {
        digitalWrite(irLedGreen, LOW);
        digitalWrite(irLedRed, HIGH);
    }

    // button is pressed
    if (buttonvalue != 0 ) { 
        digitalWrite(buttonLed, HIGH);
        Serial.println("button");
    } else if (detect == LOW) {
        digitalWrite(buttonLed, LOW);

        digitalWrite(latchPin, LOW); // prepare shift register for data
        shiftOut(dataPin, clockPin, MSBFIRST, nummers[4]); // send data
        digitalWrite(latchPin, HIGH); // update display

        Serial.println("obstakel");
    }

    digitalWrite(latchPin, LOW); // prepare shift register for data
    shiftOut(dataPin, clockPin, MSBFIRST, nummers[0]); // send data 
    digitalWrite(latchPin, HIGH); // update display
}

Answer 1

打开任何网页搜索。输入“ arduino i2c”

点击第一个链接

https://www.arduino.cc/en/Reference/Wire

阅读文字。在“示例”下找到

主读取器/从写入器：对两个Arduino板进行编程以进行通信在主读/从发件人配置中通过 I2C。

打开链接

https://www.arduino.cc/en/Tutorial/MasterReader

阅读文字。

将示例代码上传到您的arduinos

大师

// Wire Master Reader
// by Nicholas Zambetti <http://www.zambetti.com>

// Demonstrates use of the Wire library
// Reads data from an I2C/TWI slave device
// Refer to the "Wire Slave Sender" example for use with this

// Created 29 March 2006

// This example code is in the public domain.


#include <Wire.h>

void setup() {
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
}

void loop() {
  Wire.requestFrom(8, 6);    // request 6 bytes from slave device #8

  while (Wire.available()) { // slave may send less than requested
    char c = Wire.read(); // receive a byte as character
    Serial.print(c);         // print the character
  }

  delay(500);
}

奴隶

// Wire Slave Sender
// by Nicholas Zambetti <http://www.zambetti.com>

// Demonstrates use of the Wire library
// Sends data as an I2C/TWI slave device
// Refer to the "Wire Master Reader" example for use with this

// Created 29 March 2006

// This example code is in the public domain.


#include <Wire.h>

void setup() {
  Wire.begin(8);                // join i2c bus with address #8
  Wire.onRequest(requestEvent); // register event
}

void loop() {
  delay(100);
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent() {
  Wire.write("hello "); // respond with message of 6 bytes
  // as expected by master
}

理解代码，然后玩。然后将获得的知识应用于您的项目。

如何在Arduino中使用I2C协议

1 个答案:

大师

奴隶