ATtiny 85 Strange program issue

hey guys, have gotten attiny85 , figured out how program , everyhting, simple program i'm trying use isn't working. code suppost read voltage of pin #2 , turn led on if below 3.5 volts. doing however, gets power turns led on. ideas why isn't working? thanks

code: [select]


int batterypin = 2;
int ledpin = 3;
float batteryvoltage = 0.0;

void setup() {
  pinmode(ledpin, output);
  pinmode(batterypin, input);

}

void loop() {
  batteryvoltage = (analogread(batterypin)) * (5.0 / 1023.0);
  delay(5);
  if (batteryvoltage <= 3.5){
    digitalwrite(ledpin, high);
    }
  else {
    digitalwrite(ledpin, low);
    }
 
}




quote from: emaneric on jul 17, 2016, 01:31 pm

hey guys, have gotten attiny85 , figured out how program , everyhting, simple program i'm trying use isn't working. code suppost read voltage of pin #2 , turn led on if below 3.5 volts. doing however, gets power turns led on. ideas why isn't working? thanks

code: [select]


int batterypin = 2;
int ledpin = 3;
float batteryvoltage = 0.0;

void setup() {
  pinmode(ledpin, output);
  pinmode(batterypin, input);

}

void loop() {
  batteryvoltage = (analogread(batterypin)) * (5.0 / 1023.0);
  delay(5);
  if (batteryvoltage <= 3.5){
    digitalwrite(ledpin, high);
    }
  else {
    digitalwrite(ledpin, low);
    }
 
}




you're sure pin supports analog input?

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