Use Arduino for Projects > Projects > Sensor – Transducer – Detector Projects > Snowbuddy

Snowbuddy

Friday May 24, 2019 / Ibrar Ayyub

Categories: Sensor – Transducer – Detector Projects, Temperature Measurement Projects
Tags: snowman, talking, weather sensor

Contents hide

1 Things used in this project

Snowman replica that can chat with user to inform them whether outside temperature is safe for outdoor activity or not.

Things used in this project

Hardware components

Arduino MKR1000

Arduino MKR1000

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1

DHT22 Temperature Sensor

DHT22 Temperature Sensor

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1

Jumper wires (generic)

Jumper wires (generic)

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1

Software apps and online services

Arduino Web Editor

Arduino Web Editor

Telegram

Story

Motivation

Winter cool is as dangerous as summer heat since severe cold could lead to fatalities. Recently, the number of cold weather death toll is increasing in Europe. Hence, this project aims to allow the user to know whether it is safe to carry out outdoor activities.

The user can know whether it is safe to carry out outdoor activities or not by saying “Hi!” to their Snowbuddy (A snowman replica placed outside the house as Christmas decoration) via telegram.

The safety is determined based on temperature. Unsafe temperature is determined based on National Weather Service guidelines on condition that will result in frost bite. As shown in the picture, the temperature -10°F and below will result in frost bite regardless of the wind speed and therefore -10°F and below is considered as unsafe temperature for outdoor activities.

NWS Wind Chill Chart

Snowbuddy

The snowbuddy is a snowman replica equipped with a DHT22 temperature sensor. The snowbuddy can be placed outside the house as Christmas decoration. Any snowman replica can be used simply by attaching the DHT22 temperature sensor interfaced with the Arduino MKR1000 or Genuino MKR1000.

Snowman replica

The user can simply say “Hi!” to the Snowbuddy to know outside condition. The Snowbuddy will reply “Enjoy!” when the temperature is safe for outdoor activities and “The temperature is too cold. Stay indoor!” if the temperature is unsafe.

Step 1: Hardware Setup

The hardware setup is very easy. Simply connect the DHT22 temperature sensor to the Arduino MKR1000/Genuino MKR1000 based on the provided schematic. Then, attach the microcontroller together with the temperature sensor to the snowman replica.

Step 2: Telegram Bot

Create a telegram bot by using BotFather. For detailed tutorial on creating telegram bot please visit: https://core.telegram.org/bots#6-botfather

Then, insert the Bot Token, Bot Name and Bot Username into the code.

// Initialize Telegram BOT 
const char* BotToken = "306990732:AAH9yHYaBch0wUqPp5uJVDz2UHrZ0TaK7As"; 
const char* BotName = "Jad's MKR1000";     // your Bot Name  
const char* BotUsername = "Jad_MKR1000_bot"; // your Bot User Name

Demo

In this demo, the bot reply “Enjoy” since the temperature is above 0°F.

Schematics

Code

Arduino code

Arduino code to interface the Arduino MKR1000 / Genuino MKR1000 with DHT22 temperature sensor and Telegram Bot

Snowbuddyino
 
/*
  This example shows how to program a Telegram Bot
  that provide the surrounding temperature to the user
  The temperature reading is obtained using DHT22. 
  
  Compatible boards:
  Arduino/Genuino mkr1000
  Arduino/Genuino Zero + WiFi shield
*/

#include 
#include 
#include 
#include "DHT.h"

// Initialize sensor input pin & DHT sensor type
#define DHTPIN 2     // what digital pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);

// initialize variables
float temp;
float hum;
float heat_index;

// Initialize Wifi connection to the router
char ssid[] = "****";             // your network SSID (name)
char pass[] = "****";           // your network key

// Initialize Telegram BOT

const char* BotToken = "306990732:AAH9yHYaBch0wUqPp5uJVDz2UHrZ0TaK7As";
const char* BotName = "Jad's MKR1000";     // your Bot Name 
const char* BotUsername = "Jad_MKR1000_bot"; // your Bot User Name 


WiFiSSLClient client;
TelegramBot bot (BotToken,client);

void get_reading(void);  //function to get the temperature reading


void setup() {

  Serial.begin(115200);
  while (!Serial) {}
  delay(3000);


  // attempt to connect to Wifi network:
  Serial.print("Connecting Wifi: ");
  Serial.println(ssid);
  while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.println("WiFi connected");

  bot.begin();
  dht.begin();

}

void loop() {

  message m = bot.getUpdates(); // Read new messages

  if ( m.text.equals("Hi!")) {
    get_reading();
    Serial.println("message received");
    Serial.println(temp);
    if (temp<-0) {
    bot.sendMessage(m.chat_id, "The temperature is too cold. Stay indoor!");
  } else {
      bot.sendMessage(m.chat_id, "Enjoy!");
  }
}
}
void get_reading() {
// Wait a few seconds between measurements.
  delay(2000);
  
  //Read temperature
  temp = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if isnan(temp) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

}

Source : Snowbuddy

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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