- Mon Aug 14, 2023 1:09 pm
#243149
I have an Artemis ATP and I'm experiencing a really confusing. Here's the simplest test case I've been able to write to reproduce the issue. For context, I'm testing this with no wires connected to the pins.
The above code pulls D4 to HIGH and produces the following output, as expected:
If I uncomment the attachInterrupt line, then I get output that looks like this:
It looks like the pin begins floating. Again, this is all with no wires connected to any pins. Is there some consideration I'm not aware that I need to be making in this very simple example?
Additionally, if I put a Serial.writeln() call in the interrupt, I find that it's being called constantly, again with no wires attached.
Code: Select all
void setup() {
Serial.begin(9600);
pinMode(D4, INPUT_PULLUP);
// attachInterrupt(D4, [](){}, FALLING);
}
void loop() {
Serial.println(digitalRead(D4));
delay(100);
}
The above code pulls D4 to HIGH and produces the following output, as expected:
Code: Select all
1
1
1
1
1
...
If I uncomment the attachInterrupt line, then I get output that looks like this:
Code: Select all
1
0
0
1
0
1
1
0
...
It looks like the pin begins floating. Again, this is all with no wires connected to any pins. Is there some consideration I'm not aware that I need to be making in this very simple example?
Additionally, if I put a Serial.writeln() call in the interrupt, I find that it's being called constantly, again with no wires attached.