user56714: this is my very first post in here so I apologise if I am not giving you all the information that I should.
I am creating this topic to ask you help regarding how to control and use the v3 output of my Nodemcu.
I have a script which is working fine to power on and off a led by using one of the GPIO and the ground. However, my project requires to power on a small motor for about 2 seconds and then stop it. If I connect this motor to one of the GPIO and the ground I can control it but it runs very slow. If I connect the motor to the 3V output it goes fine but I can't turn it on or off. The motor requires 3V to run properly. How can I turn it on and off by powering it from that 3V output?
What am I missing?
I have a 4n25 chip which I saw in a video that has been used for a similar project however the vide is in Portuguese and I am not able to follow it properly. 
Can please someone advice?
Thank you for your time,
Ade

user4143: You cannot control the "V3" output. It's a 3.3V power supply output. Think of it like a battery. It's always on and always giving power.
Instead, you need to add a "switch" to control that power that the ESP8266 can itself control, such as a MOSFET or a motor driver (H-Bridge).

56714: <p>this is my very first post in here so I apologise if I am not giving you all the information that I should.</p>

<p>I am creating this topic to ask you help regarding how to control and use the v3 output of my Nodemcu.</p>

<p>I have a script which is working fine to power on and off a led by using one of the GPIO and the ground. However, my project requires to power on a small motor for about 2 seconds and then stop it. If I connect this motor to one of the GPIO and the ground I can control it but it runs very slow. If I connect the motor to the 3V output it goes fine but I can't turn it on or off. The motor requires 3V to run properly. How can I turn it on and off by powering it from that 3V output?</p>

<p>What am I missing?</p>

<p>I have a 4n25 chip which I saw in a video that has been used for a similar project however the vide is in Portuguese and I am not able to follow it properly. </p>

<p>Can please someone advice?</p>

<p>Thank you for your time,</p>

<p>Ade</p>
 4143: <p>You cannot control the "V3" output. It's a 3.3V power supply output. Think of it like a battery. It's always on and always giving power.</p>

<p>Instead, you need to add a "switch" to control that power that the ESP8266 can itself control, such as a MOSFET or a motor driver (H-Bridge).</p>
