My two favorite effects: Breathing Light and Gradient, can be displayed vividly in RGB, so I also have a special liking for RGB, so I will use this RGB light in the future. One is lighting and the other is atmosphere. Through the automatic linkage, the colors in the home can be greatly enriched ~ RGB, which is red, green and blue, displays the ever-changing colors through the blending of three colors in different proportions. RGBW has more white light than RGB, and RGBWW has more color temperature adjustment than RGBW, which is cold and warm light. The board I designed should be called the RGB driver board accurately, but the RGB driver boards available on Xbao are basically three-way RGB, and the most frequent application scenario for home lighting is still white light. RGB can pass three The color is full and the white light is adjusted, but the brightness is not enough. W can increase the brightness by one level. WW can adjust the color temperature under high brightness. Those who have used iPhone must know the original color display of iOS. The screen can be adjusted according to the external light. Different color temperatures allow the eyes to adapt to various environments to restore the colors and improve the reading experience; at home, I especially like the warm feeling of warm light, so RGBWW is indispensable. In the future, I will also link with environmental sensors to achieve It has the same dimming effect as the iPhone, and adjusts the color temperature of the indoor lighting according to different lighting conditions. Of course, this five-way board is fully backward compatible and basically takes all the light bars on the market.

The size is 70x63, and the five outputs are connected to:

Red is on GPIO15 Green is on GPIO13 Blue is on GPIO12 White 1 (W1) is on GPIO14 White 2 (W2) is on GPIO4

The reset button of 8266 was removed from the circuit, and only one boot button was used to download the program. Of course, after using the serial port to burn the program for the first time, you can use OTA to upgrade, and the boot button can actually be saved. It is still reserved for the convenience of the first download. The step-down circuit uses MP2451, which supports up to 36V input. But the power supply voltage is subject to the light bar, generally 12V or 24V. The design of the MOS tube is DTU35N06, the maximum continuous current is 35A, enough light bar to build, and other MOS tubes can also be used, just look at the parameter replacement, the actual I used is AOD484, the pad I painted is super , So the N-channel MOS can be replaced directly without a brain. A piece of 74HC245 is used for protection from GPIO to MOS tube, but it is added for stability, it can also be used, just short the pins A to B. In order to withstand large currents on the back of the board, the bottom solder mask of the main power supply is dug away, and tin can be deposited on it.

Using ESPhome on the firmware makes it easier to configure and use.