Arduino Blynk Lesson 3 : Servo


In this lesson, we will learn on how to control a servo using a smartphone. This is a simple project designed specially for a beginner who are interested in get started with Internet of Things (IoT).  


This tutorial use :

  1. Maker UNO
  2. Cytron ESP 8266 WiFi Shield
  3. USB Micro B Cable
  4. TowerPro SG90 Micro Servo

You can make the hardware connection based on the diagram and table below.

Figure 1 : Hardware connection.
Figure 2 : The Servo and WiFi Shield connection.

Sample Code

This is the sample code used for this tutorial. Try it!

Download latest Blynk library here:
Blynk is a platform with iOS and Android apps to control
Arduino, Raspberry Pi and the likes over the Internet.
You can easily build graphic interfaces for all your
projects by simply dragging and dropping widgets.
Downloads, docs, tutorials:
Sketch generator:
Blynk community:
Follow us:
Blynk library is licensed under MIT license
This example code is in public domain.
It's very tricky to get it working. Please read this article:
Rotate a servo using a slider!
App project setup:
Slider widget (0...180) on V3
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>
#include <Servo.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YourAuthToken";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "YourNetworkName";
char pass[] = "YourPassword";
// Hardware Serial on Mega, Leonardo, Micro...
//#define EspSerial Serial1
// or Software Serial on Uno, Nano...
#include <SoftwareSerial.h>
SoftwareSerial EspSerial(2, 3); // RX, TX
// Your ESP8266 baud rate:
#define ESP8266_BAUD 9600
ESP8266 wifi(&EspSerial);
Servo servo;
void setup()
// Debug console
// Set ESP8266 baud rate
Blynk.begin(auth, wifi, ssid, pass);
// You can also specify server:
//Blynk.begin(auth, wifi, ssid, pass, "", 80);
//Blynk.begin(auth, wifi, ssid, pass, IPAddress(192,168,1,100), 8080);
void loop()
view raw Blynk_Lesson_3.ino hosted with ❤ by GitHub


  1. Blynk – Virtual Pin
  2. What is Virtual Pins

Thank you

Thank you for reading this tutorial and we hope it helps your project development. If you have any technical inquiry, please post at Cytron Technical Forum.

2 thoughts on “Arduino Blynk Lesson 3 : Servo”

  1. Wsalam Hamdan, untuk faham, anda perlu buat step by step. Contohnya, fahamkan dahulu bagaimana 360 servo berfungsi, dan cara mengawalnya. Kemudian belajar berkenaan data yang diterima daripada Blynk, dan bagaimana menguruskannya. Barulah anda boleh cuba gabungkan keduanya. Semasa belajar, anda perlu banyak dan berani mencuba. Walaupun ia akan mengambil masa sedikit, tetapi ia berbaloi. Terima kasih.

  2. Assalamualaikum,

    saya baru nak belajar tentang arduino, blynk dan nodemcu. banyak tutorial yang saya dah buat, tapi just ikut je semua tu, ada yang faham, ada yang tak faham. contohnya kalau sy nak control 360 servo (modified) gunakan blynk, sama ada:

    1) clockwise
    2) anti-clockwise

    dan dia juga akan off lepas beberapa masa tertentu. kalau awak boleh ajar sy lebih lanjut sy amat berterima kasih. no whatsapp saya 012 9171744.. sy betul2 confius sebab terlalu banyak input yang masuk dalam kepala..

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