Blinking an LED With ESP32

Intro: Blinking an LED With ESP32

The ESP32 is an advanced IoT microcontroller board possessing WiFi and Bluetooth Low Energy capabilities, as well as limited compatibility with the Arduino Core. This is the first module in a series of tutorials regarding the use of the ESP32 Development Board, from it's equivalent Arduino projects to advanced IoT projects.

The 'Blinking an LED' project uses the ESP32 Development Board will be used to blink an LED at a specific timed interval, infinitely. It is the essential fundamental tutorial for any microcontroller board, as it is the hardware equivalent of the classic "Hello World" tutorial!!!

STEP 1: Tools and Materials

• ESP32 Development Board
• 5mm LED
• 100Ω Resistor
• 3 pieces of jumper wires
• Breadboard

STEP 2: Circuitry

• Connect the negative pin (cathode) of the LED, indicated as the flat edge of the LED to ground, shown as the blue wire.
• Connect the positive pin (anode) of the LED, indicated as the rounded edge of the LED to a 100Ω resistor.
• Connect the free end of the resistor to pin D5 on the ESP32, shown as the red wire.

STEP 3: Coding

/***
 * LED Blinking
 * Code Written by TechMartian
 */

const int ledPin = 5;

void setup() {
  // setup pin 5 as a digital output pin
  pinMode (ledPin, OUTPUT);
}

void loop() {
  digitalWrite (ledPin, HIGH);	// turn on the LED

  delay(500);	// wait for half a second or 500 milliseconds

  digitalWrite (ledPin, LOW);	// turn off the LED

  delay(500);	// wait for half a second or 500 milliseconds
}

Comments

[tonyho722]

Below figure is incorrect. it connect to to SVN not GPIO5.
https://content.instructables.com/ORIG/FAA/SC8M/J5V3S0F2/FAASC8MJ5V3S0F2.png

[john henry]

thanks this worked great once i figured out what esp32 board i needed to select in arduino board manager.

[hekoman]

how did you find out which one to select?

[john henry]

i kept trying the ones with 32 in it until it worked. lol
the seller wasn't clear and listed 5 of them making it very confusing.

[bbogdanmircea]

Hello, do you have any idea why when I want to do the same blinking by using the value of millis() % 500, and then toggle the value of the pin, then the blinking is not constant?
I don't think the delay is a nice example as this stops the processor

[abhijeet_dp]

Nice tutorial. Good place to start for an absolute beginner like me.

[steveinjava]

Using the Arduino IDE, what device do you call this module...there are several ESP32 devices listed and none seem to connect for me...Txs in advance

[SeemabF]

Hi which software you have used for ESP-module test_bed drawing

[SebastienH12]

Wrong resistor value, preferred output is 6mA only.