Arduino serial monitor lagging and cant get it to work - c++

Question

I wrote this program to check some things m but for me it is not working
` #define outputA 7
#define outputB 3
int counter = 0;
int aState;
int aLastState;
int StateAreTheSamePrinted = 0;
int StatePrinted = 0;
void setup() {
// put your setup code here, to run once:
pinMode(outputA, INPUT);
pinMode(3, INPUT);
Serial.begin(115200);
aLastState = digitalRead(outputA);
Serial.print("Arduino started");
}
void loop() {
// put your main code here, to run repeatedly:
aState = digitalRead(outputA);
if(StatePrinted == 0)
{
Serial.print(aState);
StatePrinted = 1;
}
if(aState == aLastState && StateAreTheSamePrinted == 0)
{
Serial.print("States are the same");
StateAreTheSamePrinted = 1;
}
if(aState != aLastState)
{
if(aState == 1){
Serial.print("A is high \n");
}
else
{
Serial.print("A is low \n");
}
StateAreTheSamePrinted = 0;
StatePrinted = 0;
}
aLastState = aState;
}
It always prints once arduino started, 1 (state of input), and states are the same, when I wire 5v from arduino into port 7, sometimes it react once, sometimes n ot, after few minutes it start priting output like 50-100 lines of messages and stops and lags again. Does anyone got into this problem?
`
I was expecting that after giving power into arduino 7 port it would print A is high or A is low and toggle between them

Answer 1

Sounds like you need to "debounce" after the state changes. When you hook 5v into the pin, it might not make a stable connection right away so it changes state very quickly a few times. A simple fix is to put a ~10ms delay after it detects a state change.