ESP8266 Community Forum

- Thu Apr 09, 2015 2:58 pm #14025

but interestingly enough it finds a device under all adresses even with nothing connected to the IO pins

Same with my code.
I recorded the signals with a logic analyser and they don't look like i2c.

It is necessary to use pullup resistors on the SDA and SCL line. Now I see i2c signals.

- Sat Oct 31, 2015 8:31 pm #32705 Here's a link that explains how to setup Adafruit's ESP8266 Huzzah board to a standard HD44780 LCD via i2c (includes code). Hopefully it is of use to someone as it took me longer than I would have expected to put this together due to issues with the Arduino IDE libraries and inconsistent info I found across the cyber ether regarding initiating the i2c connection.

http://imaginen4tion.blogspot.com/2015/10/how-to-connect-esp8266-to-lcd-via-i2c.html