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Here, we will demonstrate how to use this kit to remotely collect the data detected by the ultrasonic ranging sensor and display it on the mobile phone through the Blynk APP.

Some people may think that this sensor is rarely seen in ordinary times. In fact, we often use it in apartment garage systems and smart security systems.



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

Build the circuit as below:

Here we connect the Echo to port D25, connect the Trig to port D26.

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

You also need to download   LCD_I2C libraries  from following link:
LiquidCrystalDisplay_I2C library

In Arduino IDE, click Sketch->Include Library ->Add .ZIP library and upload the library zip file to the IDE. 

Download and Edit Lesson2-4 Arduino code file:
Step 1
After installing above library, please 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 6 Open Arduino IDE:  Choose corresponding board type and port type for you project.

Step 7  Arduino IDE:  Click file – Open, then choose code in the folder, load up the  sketch onto your Arduino.

Note: In the  sketch line 13,14, find these lines 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 21,22 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

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 a Widget in Blynk legacy APP

Now we need to add a Labeled Value widget to get the real time distance value. Follow the next operations:

Widget Setting 1

Open your project page and press the “+” button to add  the “Labeled Value” Widget.

Name Column: Distance

PIN:  V4

LABEL: pin/cm

After you finished all above operations, press the “ button. This will switch you from EDIT mode to PLAY mode where you can interact with the hardware.

While in PLAY mode, you won’t be able to drag or set up new widgets, press “” and get back to EDIT mode.

Widget Setting 2

In addition, you can also add GAUGE widget or Level H widget to demonstrate the changes in the values collected by the sensor.

GAUGE widget settings:

Widget Setting 3

Level H widget settings

Now you can remotely view the value detected by the ultrasonic distance sensor through the Labeled Value widget, GAUGE widget or Level H widget, you can clearly see the changes in the values collected by the sensor

If you find the device is offline, please check your code, wiring and app settings, and try again.


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