Arduino Nano won't supply high output voltage

Development Tools IDE 1.x
1

I am trying to power an LED using an Arduino Nano and I can't seem to get the LED to light up. I have a flex sensor connected to the Nano, which when it is bent to a certain point, the LED should light up by making pin 3 an output. Does anyone understand why this isn't working? Here is my code

int flexSensorPin1 = A1; //analog pin 0
int flexSensorPin2 = A2;
int flexSensorRead1;
int flexSensorRead2;
int LEDPower = 3;
int flexADJ1;
int flexADJ2;

void setup(){
  Serial.begin(9600);
  pinMode(flexSensorPin1,INPUT);
  pinMode(flexSensorPin2,INPUT);
  pinMode(LEDPower,OUTPUT);
}

void loop(){
  flexSensorRead1 = analogRead(flexSensorPin1);
  flexSensorRead2 = analogRead(flexSensorPin2);
  flexADJ1 = map(flexSensorRead1, 0, 1023, 0, 100);
  flexADJ2 = map(flexSensorRead2, 0, 1023, 60, 100);
  
    if (Serial.read() == '1'){
      Serial.println(flexADJ1);
      Serial.println(flexADJ2);
    }
    
    if (flexADJ1 <= 80){
      analogWrite(LEDPower,HIGH);
      digitalWrite(13,HIGH);
      delay(10);
    }
    else  {
      analogWrite(LEDPower,LOW);
      digitalWrite(13,LOW);
}

}
2

Do you have a resistor added to that led ?
You make pin 13 high (the system led) not pin 3.

3

You don't check if Serial.available() >0 before you try Serial.read().
Fix that so you are reading valid data.

4

Your problem is here:

    if (flexADJ1 <= 80) {
      analogWrite(LEDPower,HIGH);
      digitalWrite(13,HIGH);
      delay(10);
    }
    else  {
      analogWrite(LEDPower,LOW);
      digitalWrite(13,LOW);
   }

HIGH is defined as 1 and LOW is defined as 0. Since you are using analogWrite() you are using 1/255th power as 'on' and that won't be bright enough to see. Either use digitalWrite() with HIGH and LOW or use analogWrite() with 255 and 0.

5

I changed the code to a digitalWrite code but it still won't light up. The LED has a 472 ohm resistor in series with it.