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A standard Arduino function for measuring the voltage on an analog pin via ADC.

5 votes
2 answers
7k views

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 …
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1 vote
1 answer
832 views

External ADC reading zero while input is zero

Using ADS1115 (or any other external ADC), how its possible to read zero instead of random floating values while no any signal at the ADC's input pin? The ADS1115 is driven by an op-amp buffer as foll …
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