如何将I2C协议与arduinos结合使用

Question

我正试图用3个或更多的Arduino Uno's和1 Mega (作为主人)建造一个电梯/电梯。

Arduino Uno (奴隶)：

我已经连接了一个红外传感器，一个按钮，一个LED和一个7段显示器到Uno.

如果我按下按钮，LED就会亮起来，一直这样，直到红外传感器检测到电梯笼。然后，发光二极管将关闭和7 -segment显示器将显示地板号码。

Arduino Mega (硕士)：

该主机用于步进电机和键盘。

主人要做的是询问奴隶(在这种情况下，Uno's)是否按下按钮。

示例场景

保持架在2楼，由红外传感器检测。如果我按下2楼的按钮，梅加一定知道笼子已经在那里了。如果我按下3楼的按钮，Mega必须知道笼子在2楼，3楼的按钮被按下，它必须控制马达把笼子带到3楼，并显示在7段显示器上。

我必须使用i2c。

这是奴隶的代码：

#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
}

编辑

这是一个小项目，不是真正的电梯。我需要你的帮助，我怎样才能给大师编程。

Answer 1

打开任何网络搜索。输入"arduino i2c“

单击第一个链接

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

读课文。在“示例”下找到

主读取器/从作者:编程两个Arduino板，通过I2C在主阅读器/从发件人配置中相互通信。

打开链接

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

读课文。

将示例代码上载到您的arduinos

主控

// 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);
}

从站

// 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，玩它。然后将所获得的知识应用到您的项目中。