Ⅰ, A brief introduction to the principle of Christmas tree Suite The kit is powered by USB port, connected to 5V output power supply with power cord, unplugged the power switch S1, so that the kit is powered on, and the SCM will drive 40 LEDs on or off according to a certain rule, forming different animation effects. The single-chip microcomputer reads the audio file of the memory card and outputs it to the loudspeaker after data processing to play the music. It can also read the music information inside the MCU to output music. By decoding the code sending information of the infrared remote controller and the level change of the button, the remote controller can control the music playing and LED display. Ⅱ, Function introduction 1, LED display Adopt seven color LED, after power on, LED will automatically change various colors. 36 LEDs are distributed on the leaves of the Christmas tree. 2, Music playing Mobile memory card is also called TF card or micro SD card, hereinafter referred to as memory card. When inserting the memory card, play the wav music file of the memory card. When the memory card is not inserted, the music inside the MCU will be played. Support memory card with capacity of 1-32g, file system FAT32. 3, Remote control The remote control functions are as follows: 4, Key control This kit has a key, press the key to play the next music. 5, Voice output Use the horn to output sound. Because the speaker needs a cavity to output loud and pleasant sounds, and because the speaker is placed in the tree, it can not form a cavity well, so the volume of the kit is slightly smaller (smaller than the maximum volume of the mobile phone). 6, Download ring tone into MCU The kit can download music to the single-chip microcomputer. When the memory card is not inserted, the music in the single-chip microcomputer will be played. You can also download music to the single-chip microcomputer, see the music download tutorial in detail

7, Electrical properties Power supply: DC5V Working current: <500mA Operating temperature: 0~40℃

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