Madhav Reddy
Published © GPL3+

I2C Communication between Arduino and Raspberry Pi

Have a successful connection between Arduino and Raspberry Pi using I2C Communication Protocol.

BeginnerProtip1 hour44,423
I2C Communication between Arduino and Raspberry Pi

Things used in this project

Hardware components

Raspberry Pi 2 Model B
Raspberry Pi 2 Model B
×1
Arduino UNO
Arduino UNO
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Photo resistor
Photo resistor
×1
Resistor 10k ohm
Resistor 10k ohm
×1
Breadboard (generic)
Breadboard (generic)
×1

Software apps and online services

Windows 10 IoT Core
Microsoft Windows 10 IoT Core
Visual Studio 2015
Microsoft Visual Studio 2015
Arduino IDE
Arduino IDE

Story

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Schematics

Circiut Diagram

This circuit helps to connect components.

Code

Arduino Code

C/C++
This code is should be dumped to arduino which will read analog value from ldr on A0 pin and send it to Pi when it request
#include <Wire.h>  // Library which contains functions to have I2C Communication
#define SLAVE_ADDRESS 0x40 // Define the I2C address to Communicate to Uno

byte response[2]; // this data is sent to PI
volatile short LDR_value; // Global Declaration
const int LDR_pin=A0; //pin to which LDR is connected A0 is analog A0 pin  
void setup() {
  // put your setup code here, to run once:

  Serial.begin(9600);
  Wire.begin(SLAVE_ADDRESS); // this will begin I2C Connection with 0x40 address
  Wire.onRequest(sendData); // sendData is funtion called when Pi requests data
  pinMode(LDR_pin,INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  
delay(1000);
}
void sendData(){
  LDR_value=analogRead(LDR_pin);
  // Arduino returns 10bit data but we need to convert it to 8bit 
  LDR_value=map(LDR_value,0,1023,0,255);
  response[0]=(byte)LDR_value;
  Wire.write(response,2); // return data to PI
}

Xaml Ui

C#
change your MainPage.xaml content with this
<Page
    x:Class="I2CComm.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:I2CComm"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <StackPanel Margin="20">
            <TextBlock Text="LDR Value from Arduino " FontSize="25"></TextBlock>
            <TextBlock Name="ldr_val" Text="This will change to value return" ></TextBlock>
        </StackPanel>
    </Grid>
</Page>

Raspberry Pi Code

Open .sln file and dump it to Raspberry

Credits

Madhav Reddy

Madhav Reddy

1 project • 5 followers
I Am B.Tech Student and Have enthusiasm on Electronics and Software Projects Which Will Help people

Comments

Related channels and tags
  • Arduino
  • Communication
  • Microsoft
  • Raspberry Pi