How to check whether softpot is touched

Other Hardware Sensors
1

void setup() {
Serial.begin(9600);
}

void loop() {
int check = digitalRead(A0);

if(check == HIGH){
Serial.println("TOUCHED");
}
else{
Serial.println("NOT TOUCHED");
}

delay(50);

}

I wanted to know whether softpot is touched, but this outcome seems not what I expected.

It prints out the TOUCHED words even though I didn't even touched the softpot.

Can I please know the way that I can check if softpot is touched

2

What softpot?
Wired how exactly? (schematic - no Fritzing crap, even crappy hand drawn schematic is so much better than that).

Pot - that implies analog output. Why are you taking digital readings rather than analog readings?

And please post code between code [/] tags. Makes it much more readable.

3

Thanks for the reply

I used softpot membrane potentiometer made by 3M.

I connected 5V, GND, and A0 analog pin directly to the softpot.

I just wanted to check whether it was touched or not, like true or false.

When it is not touched, the serial prints out close to 1023 value.

But I want to print out the "softpotReading" value when it is touched as you see in the image.

Can't I get the digital value of softpot membrane potentiometer?

void setup() {
  Serial.begin(9600);
  digitalWrite(A0, HIGH);
}

void loop() {
  int softpotReading = analogRead(A0);

  int check = digitalRead(A0);

  if(check == HIGH){
    Serial.println("TOUCHED");
  }
  else{
    Serial.println("NOT TOUCHED");
  }
}

IMG_0330.jpg
IMG_0330.jpg900×675 157 KB

4

Please copy/paste code and place it between code [/] tags.

Images are best added to the body, see this image guide on how it works.

The softpod image from #2:

358d3d0f055d457e13c6eac37e45857e2895d272.jpg
358d3d0f055d457e13c6eac37e45857e2895d272.jpg900×675 157 KB

First thing to do would be to determine the values of touch:

reading = analogRead(A0);
Serial.println(reading);

Now you know the min/max values for touch/not touch. So to make it a digital reading you can simply do something like this:

reading = analogRead(A0);
if (reading < 1000) touched = true;
else touched = false;

Change the value of 1000 to something sensible based on your experiments.

Your digital pin will return LOW when it's below half or 2/3 of Vcc (I forgot the actual number - see spec sheet if you want to know it exactly). So that'd be an analog reading of <512 or <666. The point is, as long as your softpot keeps it above that number, you'll see HIGH on the pin.

5

I appreciate for your advice.

It really helped me.