CUB+2812 IoT Magic Light

## CUB+2812 IoT Colorful Lights

### **1 Introduction**

IoT mobile phone remote control colorful lights made with Tuya CUB chip. Used in daily life, it has practical value in livening up the family atmosphere.

## **2 Knowledge Points**

(1) Learn the design ideas and methods of smart home products;

(2) Learn how to use Tuya smart networking CUB chip;

(3) Learn the voltage conversion principle and drive circuit;

(4) Understand the Tuya remote control structure;

(5) Understand the selection and use of electret microphones;

(6) Understand the principles behind the operation of the Internet of Things;

(7) Learn to use EasyEDA to design schematics and PCB diagrams;

(8) Learn the composition of PCB boards and factory production processes;

(9) Practice welding skills and master the use of tools such as multimeters and soldering irons.

## **3 Introduction to onboard resources**

(1) Onboard USB power supply interface;

(2) Onboard WS2812 LED 4, which can be used during debugging or connected to an external colorful light strip;

(3) Using Tuya networking chip, the firmware is automatically generated on the Tuya IOT platform and can be used without code development;

(4) Provides three-way buttons for flexible device control.

## **4 Circuit function analysis**

The circuit design is simple and mainly consists of: USB interface circuit, WS2812 driver circuit, and three-way button control circuit.

## **4.1** USB interface circuit

** Use USB to power the device. This charging cable is very common in the market and is safe and convenient**. Use a patch fuse to protect the circuit.

### ![image.png] **4.2** The WS2812 driver circuit

uses WST3400S as the driver to increase the 3.3V voltage output by the microcontroller to 5V for WS2812 use.

### ![image.png]
### 4.3 Three-way button control circuit

Lead out 3-way buttons from Tuya CUB to facilitate function expansion.
![image.png]