Freematics Forum

Hi all,

while waiting for my kit, I wonder whether the 2 external GPIOs can be used for an external OLED display?
That would really turn the ONE+ box into a multifunction unit.

Cheers,
Florian

Yes you can. Actually the code is already there for SH1106 I2C OLED and any GPIO of ESP32 can be used for I2C.

Hi Stanley, thanks for the response.

Got my package this weekend and I started looking at the code first since I can't access my vehicle just now.
Forgive my ignorance, a couple of (noob) questions:
- How can I use other display drivers? I want to use SSD136 driver. There are libraries for Arduino, but not sure where to include it in your code.

- Didn't find any reference to the i2c pins, since they need to be mapped to the external pins with GPIO 24, 34. The code refers to them as PIN_SENSOR1 and 2.
--> edit: reference is on the developers' page: https://freematics.com/pages/products/f ... lus/guide/

- I understand ESP32 has two I2c buses. Is there any documentation how ONE+ B is wired with ESP32?
Especially i2c bus(es). I imagine at least GPS would be connected via i2c and I'd like to avoid interfering with that. Couldn't find any internal wiring charts though...
--> edit: they are linked on the main product page, duh: https://freematics.com/products/freemat ... s-model-b/

Any pointers to documentation, etc. are appreciated.

Cheers,
FD