Microcontroller used: Teensy 3.5
Components: I2C LCD 20x4 DS1307 I2C RTC Module
Situation: I will be using 2 I2C components and although my microcontroller have 3 pairs of SCL and SDA, I am not able to use the other 2 aside from the basic SCL0 and SDA0. I read online and it shows that I will need i2c_t3.h or something of that sort as well as some pullup resistors.
Problem: I tried running different type of scanners to scan the I2C devices but to no avail. The I2C scanners I used were:
I tried to change the libraries from Wire.h to the i2c_t3.h. Having read some of the other forums, I still have no idea what to do. Appreciate help in scanning the device to ensure connection as well as some basic "Hello World" code so that I know how to add in the necessary codes to address the I2C components.
Also, just a quick question. I know pullup resistors are important, what are the significants of having and not having them?
P.S. I also tried the Scanner in example of library Wire.h and the basic and advanced scanners from the i2c_t3.h library the website doesn't allow more than 9000 characters so I didn't post.