The shop will sell you all kinds of fancy holiday decorations, but nothing can match the style and grade you create yourself. [w3arycod3r] This is exactly what we did, which set off an interesting and festive Neoriver decoration. This is a battery powered product that uses a rechargeable 18650 battery and can run for several days at a low duty cycle. ATtiny85 is responsible for sending commands to various NeoPixel devices, from ring to rectangular array. Then, [w3arycod3r] has designed various PCBs, which can put the hardware and battery in a well balanced package. When they are hung on the ribbon on the Christmas tree, they can be hung well. Like the interesting part of the addressable LED, [w3arycod3r] also made some interesting animations to match. 5 of NeoPixels × 5 The rectangular array can provide scrolling text, while another animation will quickly display the RNA sequence of the coronavirus SARS CoV-2 that everyone dislikes most. It is a challenge to make everything fit into ATtiny85’s 8KB code space and 512 byte EEPROM. However, it is helpful to simplify the Adafruit NeoPixel library and use direct AVR register operations instead of conventional Arduino functions. In general, this is an interesting holiday building. It looks great on the trees. Or, consider making some Transformers decorations for yourself this holiday. And if you have an interesting vacation plan ready, put it on the tip line!