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The Wannian Calendar is one of the oldest solar calendars in ancient Chinese lore. It is named after a man named Wannian who compiled the calendar during the Shang Dynasty, and in honour of his achievements the calendar was named the Wannian Calendar. As Christmas is approaching, we have created a Christmas version of the almanac, combining Chinese and Western cultures, for those who need it.

We made a weightlifting robot this time. When the robot hears us applauding, it will lift the barbell on its chest with force, then hold it for three seconds with a smile and then put it down. If our applause keeps on coming, then the weightlifting robot will make a continuous movement to lift the barbell and be very happy, it even comes with an encouraging sound effect, which is great!

Let's combine micro:bit board, an unused Android phone, and ELECFREAKS micro:bit Nezha 48 IN 1 Inventor's Kit to create a car that can be remotely controlled via WiFi and observe the car's surroundings in real-time via the camera. In this case, we will use two applications, the eWeLink APP and the eWeLink camera APP.

Legend has it that on the night of December 24, Father Christmas flies through the sky on a sleigh pulled by nine reindeer, goes from house to house down the chimney, and quietly places presents in a stocking on a child's bed or under the Christmas tree by the fireplace.

The I2C integrated circuit bus, a serial communication bus using a multi-master-slave architecture, was developed by Philips in the 1980s to allow motherboards and embedded systems to connect low-speed peripherals.

The correct pronunciation is "I square C" or "I square C", while "I two C" is the wrong pronunciation.

PIO is a special peripheral of RP2040, let's learn more about it today because there are more contents of PIO, so this issue has more contents.

Today we introduce the last of the three brothers of communication, SPI.

In the last -term we have used ADCs and internal temperature sensors to read pin voltages and on-chip temperatures to implement the process of converting analog signals into digital signals. By now, having learned to use PWM and ADC, these set the stage for our Pico:ed to work in different situations.

Pulse-Width Modulation, or PWM for short, is a scheme that uses digital signals to simulate changes in analog signals, as most of the signals in our natural life are analog, such as brightness, speed, volume, etc.

Based on the hardware in the previous section, some of you will ask exactly how the LED lighting is achieved.

The answer is to use a GPIO peripheral.

Here you need to understand a concept, the full name of peripherals is external devices.

In the early days, UART, LCD controller, and so on, and the CPU is not on a chip, so that is called external devices.