is it possible to use multiple library's through I2C (A4 & A5). I have an IR thermometer that reads the temperature of an object from a distance that uses an I2CMaster.h file to communicate with it through the I2C. I also have an LCD backpack that communicates through I2C, but uses the Wire.h library. Will I be able to use both library's together to communicate through the same A4 and A5?
You need to sort out how to assign address to your two different devices on I2C. I'd be very surprised if these two lib's are compatible. But using wire to control the thermometer should not be difficult.
Work on getting each of the devices working on its own and then solve the problem of multiple devices on the I2C.
Mark
The first and most important thing to know is if the addresses do not conflict. If both devices share the same address it causes trouble.
Most calls on I2C are (sort of) synchronous, you request some data and wait to get it. Or you send some data and wait for ACK.
I2C is developed to have multi device(IC) on one bus, so I expect no (or minimal) interference.
Could you give links to the libs you have in mind?
is it possible to use multiple library's through I2C (A4 & A5).
Yes. Unfortunately, that doesn't mean your particular libraries can share the same i2c.