自行车无线测速仪的硬件原理图，包含蓝牙，射频，温度，时钟，霍尔，液晶等模块- U81EA u884C u8F06 u653.0 u6E2F u6D4B u901F u4EEA u7684 u786C u4EF6 u539F u7406 u56FE uFF0C u5305 u542B u84DD u7259 uFF0C u5C04 u9891 uFF0C u6E29 u5EA6 UFF0C u65F6 u949F uFF0C u970D

智能电子钟(1)计时:秒、分、时、天、周、月、年。 (2)闰年自动判别。(Intelligent electronic clock (1) timing: seconds, minutes, hours, days, weeks, months, years. (2) automatic discrimination of leap year.)