开关1控制放光二极管从左到右依次点亮，依次熄灭，反复循环；开关2控制放光二极管从右到左依次点亮，依次熄灭，反复循环；开关3控制数码管数字123456依次循环。-Switch 1 controls the light emission diode from left to right, turn off, repeat cycle　switch 2 control diodes shine light from right to left, turn off, repeat cycle　switch 3 control number 123456 followed by the digital control loop.