Taisomas Mcp23017

[[Vaizdas:Mcp23017-pinout.jpg.webp|300px]]

[[Vaizdas:Mcp23017-and-8-leds schem.png-2.webp|600px]]

This port expander provides you 16 more GPIOs and cost you around 1€. And because it communicates via I²C it only uses two GPIOs of your ESP8266 and you can address up to 8 MCP23017. That makes up to 126 additional GPIOs.

= ESP32 Wiring =

* SDA -> GPIO5
* SCL -> GPIO4
* VSS -> GND
* VDD -> VIN
* 17 -> GND
* 16 -> GND
* 15 -> GND


= ESP8266 =

https://medium.com/@wilko.vehreke/more-gpios-for-the-esp8266-with-the-mcp23017-b89f5e15cde3

[[Category:Hardware]]
[[Cateogry:ESP32]]
[[Category:ESP8266]]