ESP8266 Community Forum

Posted: **Sun Nov 20, 2016 8:51 am**

Next code does not work

void setup() {
  pinMode(2, OUTPUT);
}

void loop() {
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2, LOW);
  delay(1000);
}

Relay is connected to 5V
ESP-01 to 3.3V throw AM1117
after turning on LED on the Relay does not blink but is all time on.

Where is mistake?
Why my simple example does not work?

Posted: **Sun Nov 20, 2016 10:06 am**

You are driving the relay through a transistor or FET type circuit right? ESP can not drive a relay directly, that is to say almost any magnetic coil relay, solid state relay would work most likely but even then.... you need to read the specifications, if it takes more than a few milliamps to drive you need a driver IC in between.

http://www.learningaboutelectronics.com ... ircuit.php

RichardS

Posted: **Sun Nov 20, 2016 10:18 am**

Here is a photo how i connected ESP-01 and Relay

A s i know my relay takes few milliamps.
Why relay is always and does not change it state accordingly program?

Posted: **Sun Nov 20, 2016 11:10 am**

seems to have a driver on the board

whats that other blue box?

make sure all grounds are on, and there is +5/3.3 on the relay board

RichardS

ESP8266 Community Forum

ESP-01 with relay simple example does not work

ESP-01 with relay simple example does not work

Re: ESP-01 with relay simple example does not work

Re: ESP-01 with relay simple example does not work

Re: ESP-01 with relay simple example does not work