Hello everyone, i have a 1.8v signal and i would like to use it as a high on my interupt pin. I thought about using a transistor, but i can't figure out the values for the resistors. I have a bc845 npn transistor. I have searched on the internet but i couldn't find anyone with the same problem.
Thnx for helping
Before we answer that, it would be best for you to explain why you want an interrupt?
Most beginners have no idea of what interrupts do! 
How do we know you are a complete beginner? Because you did not explain anything about your problem. 
Why do you want to use the signal as a HIGH on an interrupt pin? An interrupt can respond to a LOW, which is produced by this circuit:
