Introduction - If you have any usage issues, please Google them yourself
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