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user30878
user30878
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My loop code is this:

// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(float(sensorValue*5000.0/1023));
delay(1);        // delay in between reads for stability

When I read 5V it gives 5000 mV. When I read 3.3V pin it gives 3211 mV. When I read 1442 mV battery it gives 1392. What do you think about this situation?

NOTE: There is no any additive circuit. Just wires.

My loop code is this:

// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(float(sensorValue*5000.0/1023));
delay(1);        // delay in between reads for stability

When I read 5V it gives 5000 mV. When I read 3.3V pin it gives 3211 mV. When I read 1442 mV battery it gives 1392. What do you think about this situation?

My loop code is this:

// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(float(sensorValue*5000.0/1023));
delay(1);        // delay in between reads for stability

When I read 5V it gives 5000 mV. When I read 3.3V pin it gives 3211 mV. When I read 1442 mV battery it gives 1392. What do you think about this situation?

NOTE: There is no any additive circuit. Just wires.

Source Link
user30878
user30878
  • 112
  • 1
  • 8

UNO analog input voltage reading not accurate

My loop code is this:

// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(float(sensorValue*5000.0/1023));
delay(1);        // delay in between reads for stability

When I read 5V it gives 5000 mV. When I read 3.3V pin it gives 3211 mV. When I read 1442 mV battery it gives 1392. What do you think about this situation?