Setting outputs and read them

Projects Programming
1

Hello,

I am trying to do a simple check - setting an output and read it's state, but something is wrong in my code.
I have 2 output pins, changing their state and reading it, but the problem is that I am always read high for both of them. :confused:
I would like to toggle the outputs and read them constantly, could you please point out my mistake?

Here is my code:

const int pinOut1 = 5;
const int pinOut2 = 6;
const int read1 = 3;
const int read2 = 4;

// state of the outputs
int out1State;
int out2State;

void setup() {
// serial comm at 9600bps
Serial.begin(9600);

// pin config
pinMode(pinOut1, OUTPUT);
pinMode(pinOut2, OUTPUT);
pinMode(read1, INPUT);
pinMode(read2, INPUT);
}

void loop() {

out1State = digitalRead(read1);
out2State = digitalRead(read2);

// ptint the outputs state in the console
Serial.print("\nOut 1 = ");
Serial.print(out1State);
Serial.print("\n Out 2 = ");
Serial.print(out2State);

digitalWrite(pinOut1, HIGH);
digitalWrite(pinOut2, LOW);
delay(500);
Serial.print("\nOut 1 = ");
Serial.print(out1State);
Serial.print("\n Out 2 = ");
Serial.print(out2State);
delay(500);

digitalWrite(pinOut1, HIGH);
digitalWrite(pinOut2, LOW);
delay(500);
Serial.print("\nOut 1 = ");
Serial.print(out1State);
Serial.print("\n Out 2 = ");
Serial.print(out2State);
delay(500);

digitalWrite(pinOut1, HIGH);
digitalWrite(pinOut2, HIGH);
delay(500);
Serial.print("\nOut 1 = ");
Serial.print(out1State);
Serial.print("\n Out 2 = ");
Serial.print(out2State);
delay(500);
}

and here is the console output:

Out 1 = 0
Out 2 = 0
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1
Out 1 = 1
Out 2 = 1

2

(deleted)

3

Well you're reading pins 3 and 4 and you're writing to pins 5 and 6 but you haven't said what is connected to any of them.

You wouldn't normally expect that writing to a pin is going to change the state of a completely different pin so I have no real idea what you're trying to do.

Steve

4

Pins 5 and 6 are connected to pins 3 and 4.
@spycatcher2k - you were right, this was exactly the issue. Thanks a lot!

5

Now I read the correct values, but I am wondering if I can perform a read and print constantly regardless of what and how I am changing in the outputs... For example read the two inputs at every 100ms and print the results, but changing the state of the outpus less frequently, e.g. 1 second or so.
I can't figure it out, could you please share some ideas?

6

As you are setting the state of the outputs you know what the state is so why do you need to read them ?