Parts: 8bit IO Expander (PCF8574)
posted Dec 27th 2008 12:00am by Ianfiled under: parts, tool hacks
Sometimes a project has more sensors, buttons, or LEDs than your microcontroller has pins. The PCF8574 is an easy way to add 8 low-speed input or output pins to a microcontroller. A configurable address lets multiple PCF8574s exist on the same bus, so two microcontroller pins can control dozens of IO pins. We’ll show you how to use this chip below.
