rotating ferris wheel

Power supply method

It can be directly powered through the ordinary USB interface and KH-TYPE-C interface; there is 1117-5.0 as the step-down circuit of the main control chip, which can be powered by an external 7.4V battery power supply, and is connected with an anti-short-circuit diode to prevent the power supply from being reversed. In this case, it will not cause the chip to burn out.

Selection of pattern lamps

Using 10 different colors of 0603LED lights and WS2812B RGB lights, the Ferris wheel can display more different effects and patterns.

Chip selection

This work uses the CH32V103C8T6 chip as the main control chip to take advantage of the chip's large storage capacity and processing speed. In terms of programming, it mainly uses the multi-threading function in the freeRTOS operating system to realize LED lights and RGB lights. They can each display different effects, and can also achieve more stunning effects by cooperating with each other, not just in the single thread of ordinary programs.

Wireless power supply function

This work controls the NE555N output pulse wave and cooperates with the MOS tube to form an inverter circuit, which inverts the original DC current into an AC-like current and converts it into a changing magnetic field through the coil. The receiving end coil converts the changing magnetic field into AC power is used, and the voltage is maintained at about 5V through the rectifier circuit and voltage regulator tube to power the Ferris wheel circuit board.