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He is interfacing 2 crash (impact) sensors to PIC18F46K22. I told him to use one external interrupt pin to interface both sensors instead of using 2 ext int pins. That is why he is using 2 input OR gate between sensors outputs and MCUs INT0 pin.
I told him to use only one ext int pin (INT0) so that INT1 and INT2 can be used for other purposes. Only one crash sensor is needed but he thinks if is better and safe to use 2 crash sensors in parallel so that if one of them fails then also his system will work. I told him to use OR gate to interface both sensors to INT0 pin.