P1口基本实验

P1口做输出口，接八只发光二极管（如图1-1），编写程序，使发光二极管从左到右依次单个点亮，再从右至左依次单个点亮，以此循环。各发光二极管的阳极通过保护电阻接到+5V的电源上，阴极接到接线端口上，因此使其点亮应使相应接线端口为低电平-P1 mouth I do basic experiments P1 output, and then eight light-emitting diodes (Figure 1-1), the preparation of procedures, so that a single light-emitting diode lighting from left to right, then right to left followed by a single light in order to cycle. The light-emitting diode resistance through the protection of the anode received+ 5V power supply, the cathode received wiring port, so it should be lit so that the corresponding connection port low