Arduino + Raspberry Pi + Ubidots Made Easy

Project tutorial

Components and supplies

Arduino UNO & Genuino UNO

Raspberry Pi 3 Model B

Temperature Sensor

Solderless Breadboard Half Size

Jumper wires (generic)

Apps and online services

Arduino IDE

Python IDLE 2.7

Ubidots

About this project

Want to connect your Arduino sensors to Raspberry Pi? This guide will serve as an easy how-to for beginners. I'm new to Arduino so I wanted to create something for everyone to be able to complete in a short amount of time.

Getting Started

Create a free account for Ubidots-http://ubidots.com

Assemble all needed equipment & supplies

Raspberry Pi Setup

Make sure Pi is connected to internet via WiFi or Ethernet

In terminal run "sudo apt-get update" & "sudo apt-get upgrade"

Install Pyserial "pip install pyserial"

Follow these instructions for installingUbibots Python library on your Raspberry Pi: https://github.com/ubidots/ubidots-python

Install Arduino IDE on your Raspberry Pi

Board Setup

For this example, I used Arduino Uno R3. Follow the Fritzing diagram provided for breadboard setup.

Plug the USB cable from Arduino into the Raspberry Pi

Copy the Arduino sketch to the IDE and upload to the board

Open Python 2.7 IDLE and copy the file provided, press F5 to run (need to save first)

You will see new readings every 10 seconds (default, can be changed in Arduino). Create your dashboard in Ubidots to display the data in whatever format you want.

Code

Arduino IDEArduino

upload to Arduino IDE

/*
 * Project: Temperature Reading and uploading value to Ubidots
 * Created by: David Escobar
 */


 const int analogTemp = A0; //temperature input pin


 void setup()
{
  //start serial communication
  Serial.begin(9600);
}

void loop()
{
  int tempRead = analogRead(analogTemp); //read analog value
  float voltage = (tempRead/1024.0) * 5.0; //convert to voltage
  float tempC = (voltage - .5) * 100; //convert voltage to celsius
  float tempF = (tempC * 1.8) + 32; //convert to fahrenheit
  Serial.println(tempF); //print value to serial port
  delay(10000); //wait 10 seconds before new reading
}

Python CodePython

Python serial connection, and uploading to Ubidots

import serial

from ubidots import ApiClient

print("Program Started")

api = ApiClient(token ='Insert your API token here') #update token

my_temp = api.get_variable('Insert your variable token here') #update variable ID

ser = serial.Serial('/dev/ttyACM0', 9600) #update with port for Arduino

while True:
    read_serial = ser.readline()
    tempReading = (float(read_serial)) #convert to float 
    new_value = my_temp.save_value({'value': tempReading})
    print(read_serial) #prints serial reading to python