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I have an Arduino Mega, and I run out of interrupt pins. I have only pin 18 available, but I need 2 of them. What can I do?
pin INTx digitalPinToInterrupt(pin)
3 INT5 1
2 INT4 0
18 TX1 INT3 5
19 RX1 INT2 4
20 SDA INT1 3
21 SCL ...