Servo Motor Controlled With BLYNK Over WiFi

Introduction: Servo Motor Controlled With BLYNK Over WiFi

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Hello All, I hope you are having a great time!

Today, we are gonna build a simple project to control a servo motor with BLYNK app over Wifi.

Overview: The slider on the blynk app will send a value to the NodeMCU/ESP8266 and this value will be written on PIN 8 and the servo rotates that much degrees.


Step 1: Things We Need

Hardware:

  • Servo SG90
  • NodeMCU
  • MicroUSB cable
  • Jumper Wires

Software:

  • Arduino IDE
  • BLYNK app

Step 2: Circuit and Connections

Connections:

  • D8 pin of NodeMCU connects to Command pin of Servo Motor.
  • 3V3 PIN of NodeMCU connects to Power PIN of Servo motor (usually RED one).
  • GND PIN of NodeMCU connects to GND of servo motor (usually BLACK one).

Simple connections, huh!

Step 3: ​BLYNK App Setup on Phone

  • Create a New Project in BLYNK app.
  • Write Project Name and Select ESP8266 or NodeMCU from dropdown.
  • An AUTH token will be sent to your registered email, note this down.
  • Tap on the screen and add a SLIDER widget on the screen.
  • Tap on the Widget, select Virtual PIN 3 and Start value must be 0 and End Value must be 180 (make sure to these values must not less than 0 and greater than 180 or you might break your servo).

Play responsibly!

Step 4: Time to Code:

We only need to add our AUTH ID(noted above), Wifi SSID and Password in the code and upload it to NodeMCU using Arduino IDE. In the code, we do not need to setup our pins this is already done by BLYNK in their library.

Code:

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.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";

Servo servo;

BLYNK_WRITE(V3) {

servo.write(param.asInt());

}

void setup() {

// Debug console Serial.begin(115200);

Blynk.begin(auth, ssid, pass);

// You can also specify server:

//Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 8442);

//Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8442);

servo.attach(15); // 15 means D8 pin of ESP8266

}

void loop()

{

Blynk.run(); // You can inject your own code or combine it with other sketches.

}

If you do not have BLYNKEsp8266 library, download the BLYNKEsp library from Sketch menu --> Include Library -->Manage Libraries. Search for the BLYNK and install it.

Step 5: Upload Your Code to NodeMCU

Upload the code to your NodeMCU or ESP8266 and device will be displayed online on your BLYNK app. Click Play button on top right of your app and slide over the slider to rotate Servo as much you need.

Oh yeah!

Your suggestions and comments are always welcome! Feel free. Till then, Happy IOTing.

Follow knowshipp.com for more IOT projects.

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    20 Discussions

    0
    None
    mfrino

    3 months ago

    My servo is an SG90, the same as yours, but it is moving incredibly slowly. I'm using it to unlock a door. Is there any way I can speed up the process? Thank you!

    why do my servo sg90 turns continously instead of rotating in degree like in your video? huhu please help me

    0
    None
    OriY2

    5 months ago

    Hi, I'm desperately trying to control the servo.
    I followed the instructions but the serve always turns in one direction. As soon as I plug in the servo, he tries to turn of his own accord. When I use the slider, it turns all the way and tries to keep turning.

    3 replies

    Now I've managed to do it in both directions.
    But I can not set the slider to 0-180. from 0 - 7 he turns in a circle.
    It has more than 180 °. There are about 270 °
    As soon as I plug in the servo he hums up very strong.

    Are you using an SG90 Servo or a continuous rotation one?

    Hello Yes I have the SG90. I took another sketch. but now it does not work as described as it should be

    0
    None
    KCC20

    10 months ago

    Hi PrakharR6

    Is is possible to add a dfplayer mini or Sd card module? how to connect and code it, Thank you.

    0
    None
    KCC20

    12 months ago

    Hi,

    Is it possible to control 2 servo motors in the same time?

    Thank you.

    5 replies

    Yes, add one more servo.attach(PIN_NUMBER); inside setup() function,
    considering that you want to control both servos with same slider.
    Else, create one more Servo variable, read values on another virtual pin from second slider and write this onto the PIN.

    I was failed to write the code for 2 different slider=.=

    Can you share your code?

    Thank you for your hits, I made it ................. so happy and many thanks.

    when i put in my code and turn on my blynk app and try to connect it, it says servo is offline

    1 reply

    Please check your AUTH token in code and in BLYNK app. Also, look for Serial Monitor under Tools Menu in Arduino IDE, to check if NodeMCU/ESP8266 is connecting or not.

    Hey, for some reason I can't control the servo enough to make it rotate a by degree. It only goes all the way one way, unless I put negative numbers in the slider.

    4 replies

    Thanks John, for finding the pointing the issue.

    I have made some corrections in code(bolded them). Also, select V3 pin for slider. So, now we shall send rotation value to V3 and nodemcu will write this value to D8 pin.

    I hope this will work fine.

    Sir plz. tell me that whether i should follow ur IMAGE OF SCHEMAtICS.. OR THE THING WRITTER JUST DOWN THE IMAGE!!!!. Plz. tell fast

    For my SG90 servo, Red wire is Vcc, Brown is GND and Orange is COMMAND.