Port expander MCP23017

The 16-bit I/O port expander MCP23017 is introduced including a library. The functions are explained by sketches and circuits.

Read More

Counter ICs

The counter ICs 4040, 4017 and 4033 will be presented. In addition to the counter function, I explain how to use the counters for port expansion.

Read More

ESP-01 port expansion

Port expansion for the ESP-01 using the MCP23017, PCF8574 and the 74HC595 shift register are explained in this post. With circuits and sample sketches.

Read More