Analog read value

Projects Programming
1

Just wondering if I am doing something wrong here or do I have a defective Arduino Uno .Code below is taken off the web tutorial TopTechBoy , simple read analog voltage from A0 .I built this circuit as it was described on the web, quite simple using a 5K pot and 5 vdc from Arduino .Basically pin 1 outermost pin +5VDC , center pin A0 , and last pin Gnd . Code written as :

int (potPin=A0);
int (readValue);

void setup() {
pinMode (potPin , INPUT);
Serial.begin (9600);}

void loop() {
analogRead (potPin);// read pot pin and put in read value
Serial.println (readValue);//print results in serial monitor
delay (250);

}

So what I get is all 0,s on serial monitor no matter where I turn the pot to. Something simple I am sure , I put a led between center pin and last pin and I can dim it so the circuit is correct . I then just loaded program on Arduino again for the sake of it and tried just using A0 and move it to gnd then 5 vdc and 3.3 vdc and still all I read on serial monitor is 0's. Driving me nuts, what is wrong?Thanks

2

Larryfos:
analogRead (potPin);// read pot pin and put in read value

That's not what that line does.

That line reads the analog pin, but doesn't do anything with the reading.

You would need to do

readvalue=analogRead(potPin);

Also, this is poor styling at the top

int (potPin=A0);
int (readValue);

Normally this would be written as:

int potPin=A0;
int readValue;

(also, potPin can be a byte instead of an int)

3

Thanks, I just found it myself and tried to get back here to delete the message,my error ,I guess that's why they say "reading is fundamental" I just need to take the time and read more carefully. Thanks I am now embarrassed a bit.