The HK9921 is a fully assembled control module designed for driving up to four individual LEDs. Each output channel supports a maximum current of 20 mA, allowing direct connection of standard LEDs without additional drivers.
The module is based on a PIC microcontroller and features 17 pre-programmed lighting effects, along with a demo mode. In demo mode, all programs are played sequentially.
Program selection is performed via a push button, and the speed of the lighting effects can be adjusted. The controller includes non-volatile memory that stores the last selected program and restores it automatically after power cycling.
Thanks to its wide supply voltage range, the module is suitable for RC models, scale models, and various decorative lighting applications.

Technical Specifications:
Operating principle: LED controller with programmable light effects.
Number of channels: 4.
Maximum current per channel: up to 20 mA.
Controller: PIC microcontroller.
Programs: 17 + demo mode.
Demo mode: automatic program sequence.
Program selection: push button.
Speed adjustment: yes.
Memory: non-volatile, stores last selected program.
Supply voltage: 6 - 14 V DC.

This product is a fully assembled module.

The video is for demonstration. The set does not include cables and LEDs.