单摆自测仪功能描述：
（1）自己用按键设定时间
（2）自己用按键设定摆长
（3）红外感应自动计数
（4）数码管实时显示计数个数
（5）计数时蜂鸣器提示
（6）自动计算半周期个数
（7）自动计算周期
（8）自动计算重力加速度
（9）用液晶显示周期、半周期个数和重力加速度(Function descr iption of the project:
(1) Using the button set the time by yourself
(2) set the length with the button by yourself
(3) automatic counting by infrared induction;
(4) digital tube real-time display count
(5) buzzer prompt when counting
(6) automatically calculate the number of half cycles
(7) automatic calculation cycle;
(8) automatic calculation of gravity acceleration;
(9) liquid crystal display period, half cycle number and acceleration of gravity;)