The use method of LCD3110、5110:

Use method for I2C 1602:

Four lines use method for 1602:

MAX7221 drives four-digit 7-seg LED:

MOS driving RGB LED, MOS drive motor, the use of the encoder

The usage of speaker and optocoupler SC

Usage of buzzer, relay, MOS tube etc.

Various LED usage

Switches, optocouplers, such as the use of light-sensitive resistors

When you use Arduino or Bluetooth and other USB chip, the computer will start to add COM ports to your PC.  When you accumulate enough COM ports, it is really annoying.  In […]