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.


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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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1 Person Made This Project!

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23 Discussions

None
Izzato1

8 months ago

is it possible to display slider value on my serial monitor? if so, how can i do it?

None
bill1959parker

Question 10 months ago on Step 1

Hi is the full code available for this or is it here but I don't understand it? I'm disabled from a head injury and find things hard to understand these days but want to build this. I have played with BLYNK but can not write code myself but hope to pick it up as I go along.
Thanks
Bill

None
ghpk

1 year ago

don't know why the motor is making some noise continuously.

even when its Idle at desired angle.

None
mfrino

1 year 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!

None
amoeba_dungeon

1 year ago

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

None
OriY2

1 year 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
None
OriY2OriY2

Reply 1 year ago

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.

None
dildev098OriY2

Reply 1 year ago

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

None
OriY2dildev098

Reply 1 year ago

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

None
KCC20

2 years ago

Hi PrakharR6

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

None
KCC20

2 years ago

Hi,

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

Thank you.

5 replies
None
PrakharR6KCC20

Reply 2 years ago

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.

None
KCC20PrakharR6

Reply 2 years ago

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

None
KCC20PrakharR6

Reply 2 years ago

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

None
max14118

2 years ago

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

1 reply
None
PrakharR6max14118

Reply 2 years ago

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.

None
John221B

2 years ago

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.

1 reply
None
PrakharR6John221B

Reply 2 years ago

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.