Arduino code for nodeMCU (esp8266) to read analog voltage from 3.5mm or 6.35mm audio interface(e.g. output of a guitar pick-up), and transform such signal to light up WS2812b leds. It implements an effect that the leds light up when strumming the guitar strings. Tutorial:https://www.bilibili.com/video/BV1LY411s7gS/
使用NodeMCU的A0针脚读取音频接口的电压（例如吉他拾音器的输出），转换为控制ws2812b灯带的亮度信号。可以实现弹吉他则灯亮一下的效果。 教程：https://www.bilibili.com/video/BV1LY411s7gS/
------------Update v1.1-------------- New Feature: Light Waves An array is used to store the historical light values, the six leds will show the brightness and colors of current and 8th, 16th, 24th, 32nd, 40th frames in the historical data array. Ref: https://www.bilibili.com/video/BV1SF411B798
新特性「波纹特效」 用一个数组存储历史电平，各弦钉显示0、8、16、24、32、40帧以前的历史亮度和颜色，来制造波纹效果。 参看：https://www.bilibili.com/video/BV1SF411B798
/Future features/
The project at present can only flash white lights, but I think this can be improved or extended at these ways:
- Use a third-party extension (such as the Blinker) which makes the color of the lights can be changed by a cell-phone APP.
- Add some FFT modules (such as MSGEQ7), to detect the frequencies of the strings, and try to change the color when different notes of chords are played.
/未来可能添加的特性/
现在这个项目只能闪白光，但是我觉得可以从以下两个方面拓展它：
- 使用第三方插件（例如点灯科技Blinker）使得可以用手机APP控制灯光颜色。
- 增加FFT模块（例如MSGEQ7），来检测当前弹奏的音符的频率或者和弦，从而改变灯光颜色。