ESP8266 Community Forum

- Mon Feb 13, 2017 10:58 am #62499 I want to setup a ESP8266-12E with a OLED display. (Arduino IDE)
There are many examples on you-tube how to do that, however........
Most examples refer to this picture: (SCL -> D1 and SDA -> D2)

picture1.png (5.1 KiB) Viewed 3336 times

But I have this hardware:

Where do I connect SCL and SDA (SCL -> GPIO ?? and SDA -> GPIO ??) and in which file do I specify that?

Attachments

This is what I have.
picture2.jpg (5.34 KiB) Viewed 3336 times

- Mon Feb 13, 2017 11:53 am #62501

SCL -> GPIO ?? and SDA -> GPIO ??

Choose 2 pins and, at Setup function write,

Code: Select allWire.begin(9,10);

where 9 as SDA and 10 as SCL

- Mon Feb 13, 2017 12:43 pm #62507 See NodeMCU pin mapping in the following.

https://github.com/esp8266/Arduino/blob ... nodemcu-09

D1 = GPIO5
D2 = GPIO4

The following image shows GPIO numbers on an ESP8266 module.

wiki/lib/exe/detail.php?id=esp8266-module-family&media=esp-12f.jpg

- Mon Feb 13, 2017 2:37 pm #62514

See NodeMCU pin mapping in the following.

https://github.com/esp8266/Arduino/blob ... nodemcu-09

D1 = GPIO5
D2 = GPIO4

The following image shows GPIO numbers on an ESP8266 module.

wiki/lib/exe/detail.php?id=esp8266-module-family&media=esp-12f.jpg

Thanks for your assistance.

It's working now.

I used D6 -> SCL (GPIO12) & D7 -> SDA (GPIO13)

I only had problems with the address select.
On the backside of the display was written : Address Select 0x78.
When I used that address it didn't work. Then I changed it to 0x3c and it was OK.

So I am still wondering what that address 0x78 is used for.

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