Cubecell pinout i2c

[Sussy_Gala]

Hi everyone, I was triyng to use some I2C sensors in my cubecell that’s based in arduino arquitecture.
At the moment to program i found out that pins i define are not the ones attached to I2C pins in the board.
Do I have to initialize I2C in a special way?

[AlexFR]

Hi, I’m actually trying to use HDC2080 with the second I²C bus on an HTCC-AM02 module. I encounter similar issues because wire.h and the sensor library I want to use need some modifications.
Not a specialist here but looking at the pinout of your board/module is a good start.
Check the indeed the definition of the I²C pins on these files depending of your board https://github.com/HelTecAutomation/CubeCell-Arduino/tree/master/variants

Wire.h or the sensor library could be other issues.
3rd question today about I²C buses, if there is a specialist here, please take a look on other posts http://community.heltec.cn/t/am02-module-plus-custom-pcb-minimal-circuit-arduino-compatible/3862/29?u=alexfr

[shaffer]

The IIC pin of CubeCell is fixed, you can only use the marked IIC pin.

[shaffer]

For boards with two groups of IIC, you can use Wire.begin(SDA,SCL) (second group of IIC pins) or Wire1.begin() to enable the second group of IIC. Wire.begin() enables the first group of IIC by default .

[AlexFR]

I use the correct designation for my pins and modify the library with.

AM02 Module Plus - Custom PCB - Minimal circuit arduino compatible

Hello @shaffer, I just solved my problem. I edited the library for the sensor HDC2080 https://github.com/tinkeringtech/HDC2080_breakout I just edited the hdc2080.cpp file at line 44. void HDC2080::begin(void) { Wire.begin(); } became void HDC2080::begin(void) { Wire.begin(SDA1,SCL1,500000); } It use now the pins GPIO8,GPIO9 as you know. Thanks for your help!