SENSORS/ACTUATORS

INTERNET OF THING (IoT)

Arduino Nano ESP32 - LED Strip

In this tutorial, we are going to learn how to program Arduino Nano ESP32 to control a LED strip to emit the light.

Hardware Preparation

1	×	Arduino Nano ESP32
1	×	USB Cable Type-C
1	×	Relay
1	×	12V 1-color LED Strip
1	×	12V RGB LED Strip
1	×	12V Power Adapter
1	×	DC Power Jack
1	×	Jumper Wires
1	×	(Alternative) 24V 1-color LED Strip
1	×	(Alternative) 24V RGB LED Strip
1	×	(Alternative) 24V Power Adapter
1	×	(Optional) 5V Power Adapter for Arduino Nano ESP32
1	×	(Recommended) Screw Terminal Adapter for Arduino Nano

Or you can buy the following sensor kits:

1	×	DIYables Sensor Kit (30 sensors/displays)
1	×	DIYables Sensor Kit (18 sensors/displays)

Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you. We appreciate your support.

Overview of LED Strip

A LED strip, also known as LED tape or LED ribbon, is a flexible circuit board with surface-mounted LEDs that emit light. These strips are versatile and commonly used for decorative lighting in various applications. LED strips come in a range of colors and are often used to provide ambient lighting, accent lighting, or decorative lighting effects.

LED strips come in two main types:

Addressable LED Strips: In this type, the color and brightness of each individual LED on the strip can be independently controlled. This capability is due to the fact that each LED is assigned a specific address.
Non-Addressable LED Strips: In contrast, non-addressable LED strips allow control over the color and brightness, but this control applies uniformly to all LEDs on the strip.

This tutorial will focus on the Non-Addressable LED Strips. For Addressable LED Strips, please refer to the following tutorials:

Arduino Nano ESP32 - NeoPixel LED Strip tutorial
Arduino Nano ESP32 - WS2812B LED Strip tutorial
Arduino Nano ESP32 - Dotstar LED Strip tutorial

Non-Addressable LED Strip Pinout

Non-Addressable LED Strip has two main types:

Non-Addressable 1-color LED strip: Only one color defined by manufacturer.
Non-Addressable RGB LED strip: any colors

A Non-Addressable 1-color LED Strip usually has two pins:

12V/24V pin: needs to be connected to the positive pin of 12V or 24V DC power supply
GND pin: needs to be connected to the negative pin of 12V or 24V DC power supply

A Non-Addressable RGB LED Strip usually has four pins:

12V/24V pin: needs to be connected to the positive pin of 12V or 24V DC power supply
R pin: This pin is used to control the red color. Connecting this pin to the negative pin of the power supply enables the red color
G pin: This pin is used to control the green color. Connecting this pin to the negative pin of the power supply enables the green color
B pin: This pin is used to control the blue color. Connecting this pin to the negative pin of the power supply enables the blue color

Arduino Nano ESP32 non-addressable led strip Pinout

We will learn how to control the both types by Arduino Nano ESP32 one-by-one.

How to Control a Non-Addressable 1-color LED strip.

If 12V LED strip is powered by 12V power supply, it emits light. To control a 12V LED strip, we need to use a relay in between Arduino Nano ESP32 and 12V LED strip. Arduino Nano ESP32 can control the 12V LED strip via the relay. Unfamiliar with relay, including their pinouts, functionality, and programming? learn about relay in the Arduino Nano ESP32 - Relay tutorial

Wiring Diagram.

Wiring Diagram between Arduino Nano ESP32 and Non-Addressable 1-color LED strip.

This image is created using Fritzing. Click to enlarge image

Wiring Diagram between Arduino Nano ESP32 and Non-Addressable RGB LED strip.

This image is created using Fritzing. Click to enlarge image

Arduino Nano ESP32 Code

Arduino Nano ESP32 Code for controlling Non-Addressable 1-color LED strip.

The below code repeatedly turns the LED strip ON in 5 seconds and OFF in 5 seconds,

Arduino Nano ESP32 Code for controlling Non-Addressable RGB LED strip.

The below code repeatedly control the color of the RGB LED strip (red, green, blue, yellow, magenta, cyan and white)

/* * This Arduino Nano ESP32 code was developed by newbiely.com * * This Arduino Nano ESP32 code is made available for public use without any restriction * * For comprehensive instructions and wiring diagrams, please visit: * https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-led-strip */ #define BLUE_PIN D6 // The Arduino Nano ESP32 pin connects to the blue pin of LED strip via relay 1 #define RED_PIN D5 // The Arduino Nano ESP32 pin connects to the red pin of LED strip via relay 2 #define GREEN_PIN D4 // The Arduino Nano ESP32 pin connects to the green pin of LED strip via relay 3 void setup() { Serial.begin(9600); // initialize ESP32 pins as digital output pins pinMode(BLUE_PIN, OUTPUT); pinMode(RED_PIN, OUTPUT); pinMode(GREEN_PIN, OUTPUT); } // The loop function repeats indefinitely void loop() { Serial.println("The LED strip is turned red"); digitalWrite(BLUE_PIN, LOW); digitalWrite(RED_PIN, HIGH); digitalWrite(GREEN_PIN, LOW); delay(2000); Serial.println("The LED strip is turned green"); digitalWrite(BLUE_PIN, LOW); digitalWrite(RED_PIN, LOW); digitalWrite(GREEN_PIN, HIGH); delay(2000); Serial.println("The LED strip is turned blue"); digitalWrite(BLUE_PIN, HIGH); digitalWrite(RED_PIN, LOW); digitalWrite(GREEN_PIN, LOW); delay(2000); Serial.println("The LED strip is turned yellow"); digitalWrite(BLUE_PIN, LOW); digitalWrite(RED_PIN, HIGH); digitalWrite(GREEN_PIN, HIGH); delay(2000); Serial.println("The LED strip is turned magenta"); digitalWrite(BLUE_PIN, HIGH); digitalWrite(RED_PIN, HIGH); digitalWrite(GREEN_PIN, LOW); delay(2000); Serial.println("The LED strip is turned cyan"); digitalWrite(BLUE_PIN, HIGH); digitalWrite(RED_PIN, LOW); digitalWrite(GREEN_PIN, HIGH); delay(2000); Serial.println("The LED strip is turned white"); digitalWrite(BLUE_PIN, HIGH); digitalWrite(RED_PIN, HIGH); digitalWrite(GREEN_PIN, HIGH); delay(2000); }

Detailed Instructions

To get started with Arduino Nano ESP32, follow these steps:

If you are new to Arduino Nano ESP32, refer to the tutorial on how to set up the environment for Arduino Nano ESP32 in the Arduino IDE.
Wire the components according to the provided diagram.
Connect the Arduino Nano ESP32 board to your computer using a USB cable.
Launch the Arduino IDE on your computer.
Select the Arduino Nano ESP32) board and its corresponding COM port.
Connect Arduino Nano ESP32 to PC via USB cable
Open Arduino IDE, select the right board and port
Copy the above code and open with Arduino IDE
Click Upload button on Arduino IDE to upload code to Arduino Nano ESP32
Check out the LED strip's state

Code Explanation

Read the line-by-line explanation in comment lines of code!

Please note that, to control the brightness an other colors of non-addressable LED strip, we need to use the L298N driver instead of relay

Video Tutorial

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