I am a bit confused with the usage of the I2C together with the Heltec library on the Arduino IDE.
I could only get the display working using the Heltec library and not invoking the Wire.h library that appears to be conflicting.
How can I use I2C for other purposes?
- a) on the same bus (pin15 = SCL/pin4 = SDA) ? without additional library? or do I need a Wire.h for that?
- b) must I imperatively use the second I2C bus (pin22 = SCL/pin21 = SDA)? without additional library), or do I need a Wire.h for that?
- c) the pin21 appear to be the Vext control as well. Using the 2nd I2C would then jeopardise that function, isn’t it? have I got the possibility to define the 2nd I2C SDA on another pin?
Let me apologise for asking so much questions, but I didn’t find the answers elsewhere.
Thank you very much for your help