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Connecting and Interfacing Raspberry Pi with Arduino

Hello pretty folks! 👋 I’m engaged on a greenhouse monitoring challenge and I needed to join my Arduino to the web over WiFi. I wished to push some sensor information to my server. I may have purchased a WiFi protect for the Arduino however why spend extra money when you have already got a Pi with WiFi card?

I ended up connecting Arduino with my Pi and pushing sensor information to my server via the Pi. The method was tremendous easy.

Step 1: Begin serial communication on Arduino

In your Arduino code it is advisable to begin serial communication throughout setup and ship some information to the Raspberry Pi. I’m utilizing the loop operate to ship the information each half-second:

void setup(){

void loop(){
    Serial.println("Welcome to Arduino :)");

Add some other code you may want in your challenge and add the code on Arduino.

Step 2: Connecting Arduino & Raspberry Pi

Join the Arduino utilizing the USB cable to the Raspberry Pi after the code has been uploaded to Arduino.

Step 3: Allow I2C on the Raspberry Pi

We have to allow I2C communication on the Raspberry Pi. I2C is a standard commonplace which permits one gadget to speak to a different. You’ll be able to allow this from the terminal by working:

$ sudo raspi-config

Now choose 5 Interfacing Choices from the record. Now choose I2C from the record and choose allow.

Enabling I2C

Step 4: Write code on Pi to learn incoming information

Create a file in your desktop on the Raspberry Pi. Add the next code within the file:

import serial
import RPi.GPIO as GPIO
import time


whereas True:

The code above goes to open up a serial connection between the Arduino and Raspberry Pi. It would run a steady loop the place it can learn incoming information from the Arduino and can print it on the terminal.

You is perhaps questioning the place I bought /dev/ttyACM0 from. That is an identifier for the USB interface. It is perhaps barely totally different for you. With the intention to discover out what this identifier is for you kind this command within the terminal:

$ ls /dev/tty*

This may print a complete bunch of stuff on the display screen:

/dev/tty    /dev/tty23  /dev/tty39  /dev/tty54      
/dev/tty0   /dev/tty24  /dev/tty4   /dev/tty55      
/dev/tty1   /dev/tty25  /dev/tty40  /dev/tty56      
/dev/tty10  /dev/tty26  /dev/tty41  /dev/tty57      
/dev/tty11  /dev/tty27  /dev/tty42  /dev/tty58      
/dev/tty12  /dev/tty28  /dev/tty43  /dev/tty59      
/dev/tty13  /dev/tty29  /dev/tty44  /dev/tty6       
/dev/tty14  /dev/tty3   /dev/tty45  /dev/tty60      
/dev/tty15  /dev/tty30  /dev/tty46  /dev/tty61      
/dev/tty16  /dev/tty31  /dev/tty47  /dev/tty62      
/dev/tty17  /dev/tty32  /dev/tty48  /dev/tty63      
/dev/tty18  /dev/tty33  /dev/tty49  /dev/tty7       
/dev/tty19  /dev/tty34  /dev/tty5   /dev/tty8       
/dev/tty2   /dev/tty35  /dev/tty50  /dev/tty9       
/dev/tty20  /dev/tty36  /dev/tty51  /dev/ttyACM0
/dev/tty21  /dev/tty37  /dev/tty52  
/dev/tty22  /dev/tty38  /dev/tty53  

Discover the string containing ACM and typically that’s going to be the interface for the Arduino.

Most often it can most likely be ACM0 so that you don’t must edit the code however whether it is totally different return and edit the file.

Step 5: Run

Excellent! We have now every part we’d like. Its time to run on the Raspberry Pi and information ought to begin exhibiting up on the display screen.


In case issues nothing reveals up on the display screen reconnect the Arduino to your laptop computer, open up the serial monitor and make it possible for information present up there at the least. If it doesn’t, there’s something mistaken together with your Arduino code.

If information reveals up within the serial monitor then restart your Raspberry Pi. Usually the age-old resolution of turning it on and off once more works wonders.

If it nonetheless doesn’t work, search on Google and if even Google isn’t capable of assist, ship me an e-mail and I’ll attempt my finest that will help you out.



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