Table of Contents
What resolution has Arduino Uno ADC?
10 bit resolution
The Arduino Uno ADC is of 10 bit resolution (so the integer values from (0-(2^10) 1023)). This means that it will map input voltages between 0 and 5 volts into integer values between 0 and 1023. So for every (5/1024= 4.9mV) per unit.
What is a 10 bit ADC?
The ADC on the Arduino is a 10-bit ADC meaning it has the ability to detect 1,024 (2^10) discrete analog levels. Some microcontrollers have 8-bit ADCs (2^8 = 256 discrete levels) and some have 16-bit ADCs (2^16 = 65,536 discrete levels). The way an ADC works is fairly complex.
How many bits ADC does Arduino have?
10-bit
The Arduino has a 10-bit ADC (2^10 = 1024). We store this value into an int because x is bigger (10 bits) than what a byte can hold (8 bits).
How can I improve my ADC accuracy?
To minimize the ADC errors related to the external environment, take care of the reference voltage and power supply, eliminate the analog-input signal noise, match the ADC dynamic range to the maximum signal amplitude, and match analog-source resistance.
What is the resolution of the Arduino Uno ADC?
The Arduino Uno ADC is of 10 bit resolution (so the integer values from (0- (2^10) 1023)). This means that it will map input voltages between 0 and 5 volts into integer values between 0 and 1023. So for every (5/1024= 4.9mV) per unit.
How can I increase the number of apparent bits in Arduino?
Using an ADC with more bits makes the the minimum step size (LSB) smaller to give higher resolution. The Arduino Uno is fixed at 10 bits but there is a way of increasing the number of apparent bits; see this page: Arduino ADC bit increasing. The power supply. The internal reference diode (nominally 1.1V). An external voltage reference.
What is the default resolution of the ADC?
It defaults to 10 bits (returns values between 0-1023) for backward compatibility with AVR based boards. The Due, Zero and MKR Family boards have 12-bit ADC capabilities that can be accessed by changing the resolution to 12.
Why do I have to return only 10 bits on Arduino?
Some of the Arduinos e.g. DUE have 12 bit ADCs built in, so returning 10bits will keep the code in these boards compatible with other Arduino boards that only have a 10 bit ADC. This is the default operation – to get 12 bits you will need to use analogReadResoution (12).