The microcontroller used in this project is also made by Sipeed. It is called the Maix Bit and was released a few years ago. It features a high-performance SoC called Kendryte K210, which can be used for edge computing.

AI devices evolve quickly, and boards from a few years ago may seem outdated, but I think the K210 is still a very capable device with plenty of potential for use. 

There are several types of development boards that use the K210, including those with many GPIO pins, smaller sizes, and those with an integrated enclosure, among others. The Maix Bit is a well-balanced type that has many GPIO pins and a compact size.

In addition to GPIO pins, the board is equipped with connectors for a camera and an LCD display. These camera and display will also be used in the device we are building this time. The display is a 320×240 pixel LCD, and the camera is an OV2640 type that uses an M12 lens mount, allowing the lens to be changed if necessary.
Although we will not be using it this time, the board also has one MEMS microphone.

When testing MaixBit, it is convenient to use a 400-hole breadboard as shown in the photo.