I was intending to use pins 2 AND 3 for interrupt signals that are active LOW.
simplified code:
const int srcOne = 2; // first interrupt source
const int srcTwo = 3; // 2nd interrupt source
void setup() {
pinMode(srcOne, INPUT_PULLUP);
pinMode(srcTwo, INPUT_PULLUP);
}
void loop() {
int s1State = digitalRead(srcOne);
int s2State = digitalRead(srcTwo);
SerialMonitorInterface.print("s1:"); SerialMonitorInterface.println(s1State);
SerialMonitorInterface.print("s2:"); SerialMonitorInterface.println(s2State);
}
....
The result is:
s1:0
s2:1
... any idea why pin2 behaves differently than expected? (and Yes, pulling Pin3 LOW is
recognized... s2:0) I can't conveniently put an external pullup on my Pin2 (due to wiring
constraints) but didn't think I'd need to. thanks for any inputs! (Pun Intended!
===>>> UPDATE:
I *think* I may have identified the source of the behavior I'm seeing. One of the items
that I've stacked is the Nordic BLE module, which I found uses pin 2 for interrupts. So,
perhaps the order of my "pinMode(2, INPUT_PULLUP)" then call to BLEsetup() has the pin
function being "superseded"? I guess I'll have to try eliminating the BLE from the stack and
see if the behavior changes. I'll post my findings.
