Servo not working with nodemcu 0.9 esp-12 ESP8266

[joortiz22]

trying to run basic sketch sweep.

servo does nothing despite fidgeting when initial plug in.

Servo Motor MG995 360 Degree Continuous Rotation - ProtoSupplies

It needs 4.8-7.2 V
and micro usb gives 5V & 1 Amp

processor nodemcu 0.9 esp-12

what's wrong

/* Sweep
 by BARRAGAN <http://barraganstudio.com>
 This example code is in the public domain.

 modified 8 Nov 2013
 by Scott Fitzgerald
 https://www.arduino.cc/en/Tutorial/LibraryExamples/Sweep
*/

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position

void setup() {
  myservo.attach(D1);  // attaches the servo on pin 9 to the servo object
}

void loop() {
  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15 ms for the servo to reach the position
  }
  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15 ms for the servo to reach the position
  }
}

[Railroader]

The drawing looks okey.
Can You use a DMM and check Vcc at the servo?
Is the servo logic level the same as the ESP8266?

[Railroader]

Plenty of servos (54 pages) in that link. Can You get down to the servo You use and post a link to it?

[joortiz22]

@Railroader

Is the servo logic level the same as the ESP8266?

I don't understand

[Railroader]

There are circuits/devices using 0 - 3.3 volt logic and other devices using 0 to 5 volt logic. They are not straight on compatible.
The signal the servo uses is most likely 0 to 5.0 volt.
I don't know the ESP that well but suspect its output is like 0 to 3.3 volt level. Often 5 volt devices work being given 0 to 3.3 volt signals.
I didn't find the exact datasheet of Your servo so I can't say for sure if that's the problem.

[joortiz22]

I edited the link would you be willing to look at it. And I just ordered a multimeter should be here tomorrow. I also changed my code but it didn't do anything

[Railroader]

Thanks. That servo needs a power supply capable of delivering 1.5 amp. This current is used when starting from standing still. What is the rating of the supply You use?

I found no data indicating any logic fault. (3.3 versus 5 volt)

[MicroBahner]

ESP8266 is a 3.3V device, so the HIGH voltage on an output pin is 3.3V, not 5V. But all servos I tried so far worked with 3.3V at the signal input.
A problem may be the D1 output pin. GPIO1 is TX of Serial, and by default used for debug output.
Did you try another pin, e.g. GPIO5?

And sometimes there is a little bit confusion with the Dx numbering and the GPIO numbering. Can you make a photo of your board?

E.g. compare this:

and this

I would always recommend to use the GPIO numbers directly ( without 'D' )