WS2811 decoding amplifier for high power RGB LED light control

It is very common to use STM microcontroller SPI to control WS2811/2812 lights, but they generally have low power and low brightness, and are not suitable for other high-power equipment such as stage lights or light strips.

This is a control card that uses the WS2811 SPI bus to control high-power devices. There are 12 output channels in total, and the theoretical current of a single channel can reach 15A (not recommended).

Use high power mos and some logic chips. Convert the output of WS2811 into PWM signal and input it to mos for control.

Instructions for use: The left pin header is for signal input, the top of the two pin headers is GND, and the bottom is DAT.

The upper binding post is connected to the negative pole of the lamp, and the lower binding post is connected to the negative pole of the power supply. The positive terminal of the lamp is directly connected to the positive terminal of the power supply.

The straw hat light shows the 2811 output, and the 0603 light shows the 7404 output. The upper right corner is the power indicator light.

The DC005 connector is the power input of the control card, the voltage is 5V

Note: Not all 5mm straw hat LEDs have a voltage drop that allows the 74hc04 to output normally. The manual for the 2811 chip states that a 5K ohm resistor can be used instead, but I have not tried it.

The control card has a constant voltage output. Please note that the RGB lamp beads have different voltages. The red voltage is low and requires a series resistor to limit the current! ! Constant current board is under development. .

The board and microcontroller must share the same ground, otherwise they will flash randomly.

Only suitable for common yang lamps, not for common cathode lamps.

The maximum withstand voltage of MOS is 36V, and it must not be connected to lamps or power supplies higher than 36V.

Not suitable for high-power inductive loads (motors, water pumps). A freewheeling diode is required when connecting this type of load, otherwise the induced voltage will burn the MOS. I have actually tested this method of use to be very unstable.

Need a better AMS1117, the current is a bit high.

0603LED is preferably green, do not use red or yellow, and does not have a current limiting resistor.

When starting up, it is best to power on the lamp first and then the board. Unstable output when some power supplies are started may cause the board to work abnormally.

Effect video:

https://www.bilibili.com/video/BV1E3411j72q