avr开发板的基础实验，包括流水灯、按键、蜂鸣器、LED点阵、数码管、定时器、步进电机、LCD1602和12864、ds18b20、hs0038、AD/DA转换实验，功能很全。-avr development board based on experiments, including water lights, buttons, buzzer, LED dot matrix, digital control, timer, stepper motor, LCD1602 and 12864, ds