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Hello, I'm a beginner so I think the answer is simple. I have an HC-SR04 connected to 4 AA batteries at 5.4V. The echo from the ultrasonic sensor goes through a voltage divider with 20k and 10k ohm resistors before going into P1.1. My f2013 is being powered by the usb programming tool and is using P1.2 as the out/trigger pin for the hc-sr04. I beleive the sr04 can take a 3.3V trigger. This is my code below, I just can't figure out why my interrupt isn't triggering. I borrowed some code from the internet. I can't remember his username, but the guy with the wall racer with two