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[英]Sending Byte from Raspberry Pi to Arduino With I2c & IoT for PWM
[英]Arduino UNO sending Temperature and Humidity data from DHT11 sensor to Raspberry pi 2(running windows iot core) through I2c
我已經將Arduino UNO作為從屬設備,並將Raspberry Pi 2作為主設備。 在Arduino UNO上運行的代碼如下:
#include "DHT.h"
#include<Wire.h>
#define DHTPIN 4 // what digital pin we're connected to
#define DHTTYPE DHT11 // DHT 11
#define SLAVE_ADDRESS 0x29
DHT dht(DHTPIN, DHTTYPE);
int t;
void setup() {
Serial.begin(9600); //setting baud rate for communication
Wire.begin(SLAVE_ADDRESS); //assigning slave with i2c at defined slave address
Wire.onRequest(sendData); //Event for sending the data through i2c
dht.begin();
}
void loop() {
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
t = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" *C ");
Serial.print("\n");
Wire.onRequest(sendData); // asked to send the data
delay(1000);
}
void sendData(){
Wire.write(t);
Serial.print("in send data:"+t);
}
Raspberry Pi 2代碼是用c#編寫的。 如下:
using System;
using Windows.UI.Xaml.Controls;
using Windows.Devices.Enumeration;
using Windows.Devices.I2c;
using System.Diagnostics;
using System.Threading;
namespace App2
{
public sealed partial class MainPage : Page
{
private I2cDevice Device;
private Timer periodicTimer;
public MainPage()
{
this.InitializeComponent();
initcomunica();
}
private async void initcomunica()
{
var settings = new I2cConnectionSettings(0x29); // Arduino address
Debug.WriteLine(settings);
settings.BusSpeed = I2cBusSpeed.StandardMode;
Debug.WriteLine(settings.BusSpeed);
string aqs = I2cDevice.GetDeviceSelector("I2C1");
Debug.WriteLine(aqs);
var dis = await DeviceInformation.FindAllAsync(aqs);
Debug.WriteLine(dis);
Debug.WriteLine(dis[0].Id);
Device = await I2cDevice.FromIdAsync(dis[0].Id,settings );
periodicTimer = new Timer(this.TimerCallback, null, 0, 1000); // Create a timmer
}
private void TimerCallback(object state)
{
byte[] RegAddrBuf = new byte[] { 0x08 };
byte[] ReadBuf = new byte[5];
try
{
Device.Read(ReadBuf); // read the data
Debug.WriteLine(ReadBuf);
}
catch (Exception f)
{
Debug.WriteLine("error in reading from buffer"+f.Message);
}
// Converte Byte to CharArray
char[] cArray = System.Text.Encoding.UTF8.GetString(ReadBuf, 0,5).ToCharArray();
String c = new String(cArray);
Debug.WriteLine(c);
}
}
}
Raspberry Pi 2和Arduino UNO之間完成的連接:
使用電阻為1K ohm和2k ohm的分壓器電路為Pi提供3.3V電壓,而不是5V。
DHT11傳感器與Arduino UNO的連接。
問題:我已經用c#編寫的Pi代碼從Visual Studio部署了通用Windows應用程序,但是代碼中出現異常。 異常和錯誤如下:
引發異常: mscorlib.ni.dll中的“ System.Runtime.InteropServices.COMException”
WinRT信息:無法將連接設置應用於設備。
附加信息:連接到系統的設備不起作用。
要求:我已經在Internet上搜索了有關此異常的所有信息,但未找到任何解決方案,並且Raspberry Pi 2無法與Arduino UNO通信。不知道這是Arduino方面還是Raspberry Pi方面的問題。
請幫我解決這個問題。
看來您的台詞是錯誤的。 通常,SCL引腳連接到SCL,SDA連接到SDA。 它沒有像UART那樣反轉。
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