atmega48制作的电动车里程表，PB0 PB1 口用作上下按键 PB3为圈数脉冲 脉冲输入用霍尔44E作为脉冲输入，PD作为4位数码管显示端口，有3种显示模式速度、里程、车轮周长-the atmega48 produced electric car odometer, PB0 PB1 used as the up and down buttons PB3 input pulse pulse of the number of laps with Hall, 44E as a pulse inp

详细介绍 JOdometer是一个计数器的工作原理就像一个里程表:移动数字像在轮 -Detailed introduction JOdometer is a counter that works like an odometer: moving the Numbers up like in a wheel