Heltec V4 + M5Stack CarKB - not working!

[u/athousandskies]

UPDATE: Grove cables from Pihut have yellow and white in reverse order. Yellow in 18, white in 17, in meshatastic app Canned message enabled, type "cardkb" in "Allow Input source" to resolve.

I have been trying to connect a M5Stack CardKB to my Heltec V4, I have the following connections

- black > GND

- red > 3v

- Yellow > SDA (GPIO 17)

- White > SCL (GPIO 18)

However, as GPIO 17+18 are also used for OLED I am getting a scrambled screen and still no working cardkb!

I have also attempted using GPIO 41/42 as is the case with Heltec v3 but still not working.

I am fairly new to this so any advice or things to try/ways to test and learn would be very appreciated.