1x4 Button membrane help

Question

Im trying out this membrane from Adafruit that i bought last week but i have a little issue. ITS SO SENSITIVE! i as so just touch it with my finger and it transmits!. Anyone that has worked with this membrane have the same issue? is there some sort of "fix"?

UPDATE

Its really simple. But one weird thing, not sure if its supposed to be like that, but by default, the buttons are on HIGH. i used Serial.println(digitalRead(one)); to verify that and the output was 1.

int two =  8;
int one = 9;
int four = 10;
int three = 11;

void setup() {
  pinMode(one, INPUT);
  pinMode(two, INPUT);
  pinMode(three, INPUT);
  pinMode(four, INPUT);
  Serial.begin(9600);
}

void loop() {
  if(digitalRead(one) == LOW){
    Serial.println("One");
  }else if(digitalRead(two) == LOW){
    Serial.println("Two");
  }else if(digitalRead(three) == LOW){
    Serial.println("Three");
  }else if(digitalRead(four) == LOW){
    Serial.println("Four");
  }
}

You have the pullups enabled on the 4 pins, right? – Ignacio Vazquez-Abrams Oct 02 '15 at 00:36 — Ignacio Vazquez-Abrams, Oct 02 '15 at 00:36
Please show your code and wiring. – Nick Gammon Oct 02 '15 at 00:37 — Nick Gammon, Oct 02 '15 at 00:37
This is my setup and my code will updated – xR34P3Rx Oct 02 '15 at 00:58 — xR34P3Rx, Oct 02 '15 at 00:58

score 4 · Accepted Answer · answered Oct 02 '15 at 01:06

4

pinMode(one, INPUT);

You have configured the input with no pullup. Since it is a CMOS input and hence very high impedance, it effectively acts as an antenna picking up random signals including that of your finger becoming capacitively coupled to it. You must enable the pullup on the pins (and connect the common to ground) if you want correct operation.

 pinMode(one, INPUT_PULLUP);

answered Oct 02 '15 at 01:06

Ignacio Vazquez-Abrams

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i was not aware of such a thing, thanks! Im quite new to arduino – xR34P3Rx Oct 02 '15 at 01:08

1x4 Button membrane help

1 Answers1