ESP32 KY-034 Automatic Flashing Color LED Module

🛠️ KY-034 Automatic Flashing Color LED Module Troubleshooting

This guide outlines a systematic approach to troubleshoot and resolve common problems with the . Start by confirming that the hardware connections are correct, as wiring mistakes are the most frequent cause of issues. If you are sure the connections are correct, follow the below steps to debug common issues.

❌ LED Not Lighting Up

🎨 LED Not Changing Colors

💻 Code Examples

Below you can find code examples of KY-034 Automatic Flashing Color LED Module with ESP32 in several frameworks:

• Arduino IDE
• ESP-IDF
• ESPHome
• PlatformIO
• MicroPython

If you encounter issues while using the KY-034 Automatic Flashing Color LED Module, check the Common Issues Troubleshooting Guide.

ESP32 KY-034 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the KY-034 Automatic Flashing Color LED Module:

int led = 13; // Declaration of the LED input pin

void setup() {
    pinMode(led, OUTPUT); // Initialization output pin for the LED
}

void loop() {
    digitalWrite(led, HIGH); // LED is switched on
    delay(4000); // Wait for 4 seconds
    digitalWrite(led, LOW); // LED is switched off
    delay(2000); // Wait for another two seconds
}

This Arduino code initializes pin 13 as an output to control the KY-034 module. In the loop, it turns the LED on for 4 seconds and off for 2 seconds repeatedly, allowing the LED to cycle through its automatic color sequence during the on periods.

Connect your ESP32 to your computer via a USB cable, Ensure the correct Board and Port are selected under Tools, Click the "Upload" button in the Arduino IDE to compile and upload the code to your ESP32.

ESP32 KY-034 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the KY-034 Automatic Flashing Color LED Module, here's how you can set it up and read data from the sensor. Fill in this code in the main ESP-IDF file:

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

#define LED_PIN GPIO_NUM_13

void app_main(void) {
    gpio_config_t io_conf = {
        .intr_type = GPIO_INTR_DISABLE,
        .mode = GPIO_MODE_OUTPUT,
        .pin_bit_mask = (1ULL << LED_PIN),
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .pull_up_en = GPIO_PULLUP_DISABLE
    };
    gpio_config(&io_conf);

    printf("KY-034 Automatic Flashing Color LED Test\n");
    while (1) {
        gpio_set_level(LED_PIN, 1); // LED on
        vTaskDelay(pdMS_TO_TICKS(4000));
        gpio_set_level(LED_PIN, 0); // LED off
        vTaskDelay(pdMS_TO_TICKS(2000));
    }
}

This ESP-IDF code configures GPIO13 as an output for the KY-034 module. It turns the LED on for 4 seconds and off for 2 seconds in a loop, allowing the LED to display its automatic color-changing sequence during the on periods.

Update the I2C pins (I2C_MASTER_SDA_IO and I2C_MASTER_SCL_IO) to match your ESP32 hardware setup, Use idf.py build to compile the project, Use idf.py flash to upload the code to your ESP32.

ESP32 KY-034 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the KY-034 Automatic Flashing Color LED Module

light:
  - platform: binary
    name: "KY-034 Flashing Color LED"
    output: ky034_output

output:
  - platform: gpio
    id: ky034_output
    pin: GPIO13

This ESPHome configuration sets up the KY-034 module as a binary light component on GPIO13. The light can be controlled via Home Assistant or other ESPHome-compatible interfaces, turning the LED on to display its automatic color sequence and off as desired.

Upload this code to your ESP32 using the ESPHome dashboard or the esphome run command.

ESP32 KY-034 PlatformIO Code Example

Example in PlatformIO Framework

For PlatformIO, make sure to configure the platformio.ini file with the appropriate environment and libraries, and then proceed with the code.

Configure platformio.ini

First, your platformio.ini should look like below. You might need to include some libraries as shown. Make sure to change the board to your ESP32:

[env:esp32]
platform = espressif32
board = esp32dev
framework = arduino

ESP32 KY-034 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the KY-034 Automatic Flashing Color LED Module:

#include <Arduino.h>

#define LED_PIN 13

void setup() {
    pinMode(LED_PIN, OUTPUT);
    Serial.begin(115200);
    Serial.println("KY-034 Automatic Flashing Color LED Test");
}

void loop() {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("LED ON");
    delay(4000);
    digitalWrite(LED_PIN, LOW);
    Serial.println("LED OFF");
    delay(2000);
}

This PlatformIO code initializes GPIO13 as an output for the KY-034 module. It turns the LED on for 4 seconds and off for 2 seconds in a loop while printing status messages to the serial monitor.

Upload the code to your ESP32 using the PlatformIO "Upload" button in your IDE or the pio run --target upload command.

ESP32 KY-034 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the KY-034 Automatic Flashing Color LED Module with your ESP32.

import machine
import time

LED_PIN = machine.Pin(13, machine.Pin.OUT)

while True:
    LED_PIN.on()
    print("LED ON")
    time.sleep(4)
    LED_PIN.off()
    print("LED OFF")
    time.sleep(2)

This MicroPython script configures GPIO13 as an output for the KY-034 module. It continuously cycles the LED on for 4 seconds and off for 2 seconds, printing status messages to the console.

Upload this code to your ESP32 using a MicroPython-compatible IDE, such as Thonny, uPyCraft, or tools like ampy.