ESP8266 Community Forum

- Sat May 05, 2018 8:21 am #75775 Hello all

I was looking for a way to extend the GPIO pins in ESP12.Was doing a bit of search did came across Did some search and saw MCP23017 but do advice me with this and needed way to extend GPIO pins

- Sat May 05, 2018 9:15 am #75779 Yes, MCP23017 is a good GPIO expander, it is my favorite !
You can hook it up its I2C bus on GPIO2/GPIO0 since there are already pullups there for proper boot mode.

- Sat May 05, 2018 10:44 pm #75790 Other good options: the classic PCF8574/5 for a simple 8/16 channels GPIO port expander or PCA9685 for a nice 16Channel 12-bit PWM I²C-bus LED controller one.

For more details about, drivers code inspiration, etc , you can take a look here: GPIO and PWM expanders related articles

ESP8266 MPDMv4 AC MAINS Dimmer Home: http://esp8266-projects.com/2016/04/mpdmv4-mains-dimmerswitch-html/
Available on Tindie: https://www.tindie.com/products/nEXT_EVO1/universal-ac-mains-dimmer-mpdmv41/

- Sun May 06, 2018 8:12 am #75793 Thanks a lot