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Topic: my pins give me 1 all the time ! (Read 596 times) previous topic - next topic

nathan_kia

Hi, I got my first arduino uno last week. I had a problem and I thought it's because of bouncing but It's getting so annoying can anyone help me.

here is the problem :

I made the switch circuit with 2 wires and with a 10K resistor . The diagram is like this

http://www.codeproject.com/KB/system/Interfacing_Arduino_LCDs/PushButtonSchematic.png

except there is not 100ohm resistor.

when I connect the wires I should see 1 on the serial monitor and when I disconnect them 0 .
but it's always 1 !
when I connect the wires i it goes to 0 and 1 for a couple of times  and then it becomes 1. when I disconnect it it stays at 1 for a a few seconds and it goes to 0 sometimes and sometimes doesn't. 

this the simple program that I wrote to light a led when the switch is pushed is like this:
//

#define enc 8
#define led 13
int count = 0 ;

void setup()

{
pinMode(enc,INPUT);
pinMode(led, OUTPUT);
Serial.begin(9600);
}

void loop()
{
int val = digitalRead(enc);
if (val ==HIGH)
{
digitalWrite(led,HIGH);
Serial.println(val);
}
else{
digitalWrite(led,LOW);
}
}

I thought maybe it's because of bouncing. because it was like this since the first day that I got the Arduino.
but today I had problem in counting pulses from encode and I was told it's because of my pins has problem.
there any other way to check the pins ? it's UNO btw.

can anyone help me ?


nathan_kia

right, I should put the Serial.print out of the if statement .

but the problem is when the wires are not connected, I still get 1 which is weird. it should be 0 .

James C4S


right, I should put the Serial.print out of the if statement .

but the problem is when the wires are not connected, I still get 1 which is weird. it should be 0 .

Or put a print statement in the "else" clause of your if-statement,  otherwise you only print when it is high.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

James C4S

None of your image links work.

If you click "additional options" you can attach pictures in the post editor.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

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