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In this tutorial, we will learn how to use OSOYOO IoT kit with Blynk APP to make a remote fire alarm. When the fire alarm detects a flame, it will trig  alarm and the white warning light will turn on. At the same time, the Blynk APP will also push fire alarm notifications .



First, please plug OSOYOO MEGA-IoT Extension Board into MEGA2560 board:

Build the circuit as below:

Flame sensor- A1        Make sure the Fire sensor is on “A” side.

Active buzzer – D7

White LED- D2

You need to install Local Blynk Server, Blynk APP, Arduino IDE, Blynk Libraries before running the code of this lesson. If you haven’t done these installations, please read following contents in lesson2-1 link:

If you have installed above libraries, please go to next stage:
Download and Edit Lesson3-3 Arduino Code
Step 1 Download the code from following link, unzip it:

Step 2 After above operations are completed, connect OSOYOO MEGA2560 Board to PC with USB cable.

Notice: Shut off your battery or unplug your power adapter when upload sketch code to Arduino.

Step 3 Open Arduino IDE:  Choose corresponding board type and port type for you project .

Step 4  Arduino IDE:  Click file – Open, then choose code in the folder, load up the  sketch onto your Arduino.

You need to edit the code as following:


Note: In the  sketch, find these code in line 13,14 as following:

char auth[] =”0ByWpc50cmOJ5O6OyHMaK4OSHkDvUeI-”;
char server_ip[]=”″; // replace this line with your Blynk Server IP addres;

Replace 0ByWpc50cmOJ5O6OyHMaK4OSHkDvUeI- with your local Blynk Token.
Replace with your local Blynk Server LAN IP address.
If you don’t know how to get token and Server IP address, read this article.

In   lines 17,18 and replace *** with your wifi ssid/password

char ssid[] = "***";//replace this line with your wifi ssid
char pass[] = "***"; //replace this line with your wifi password

please replace the *** with your correct wifi SSID and password, otherwise your project can not connect to Internet.

Upload the sketch to the board. Wait until you see something like this:

Done uploading

Now open your Serial Monitor, you will see Arduino is trying to talk to Blynk server. After 20 to 30 seconds, your Serial monitor will finally shows Arduino’s IP address and a “Ready (ping: 25ms)” ending message.

Congratulations! You are all ready! Your hardware is now connected to the Blynk server.

Add Widgets in your Blynk legacy APP

We need to add Notification and Email widgets on your Blynk APP.

Notification Widget settings:

Then set the Blynk notification to the highest authority in the phone settings.

press the “▷” button to start your project.This will switch you from EDIT mode to PLAY mode .

Push Notifications

Push Notification widget allows you to send push notification from your hardware to your device. Currently it also contains 2 additional options:

WARNING: high priority contributes more to battery drain compared to normal priority messages.

Example code:

Blynk.notify("Hey, Blynkers! My hardware can push now!");

You can also use placeholder for device name, that will be replaced on the server with your device name:

Blynk.notify("Hey, Blynkers! My {DEVICE_NAME} can push now!");


Sketch: PushNotification

When the fire alarm detects a flame, it will sound an alarm, and the white warning light will be light. At the same time, the Blynk APP will also push fire alarm noticications and emails to your phone.

At the same time, you phone will receive a noticication:

No. Picture Device Qty. Link
1 OSOYOO MEGA2560 Board 1 Click here to buy
2 OSOYOO MEGA-IoT Extension Board 1 Click here to buy
3 Photosensitive Sensor 1 Click here to buy
4 Temp & Hum Sensor 1 Click here to buy
5  OSOYOO Active Buzzer Module 1 Click here to buy
6 Flame Detection Sensor 1 Click here to buy
7 Fan Motor Module 1 Click here to buy
8 Micro Servo Motor 1 Click here to buy
9 RGB Module 1 Click here to buy
10 Ultrasonic Sensor 1 Click here to buy
11 PIR Motion Sensor 1 Click here to buy
12 Microphone Module 1 Click here to buy
13 1602 I2C LCD Screen 1 Click here to buy
14 RFID Module 1 Click here to buy
15 White LED Module 1 Click here to buy
16 Red LED Module 1 Click here to buy
17 Colorful Light 1 Click here to buy
18 Red Button Module 1 Click here to buy
19 Blue Button Module 1 Click here to buy
20 Philips Screwdriver 1 Click here to buy