Arduino UNO R4 WiFi ADC Resolution

In this tutorial you will learn how to change the analog-to-digital converter (ADC) on an Arduino UNO R4 WiFi board. By default, the resolution is set to 10-bit, which can be updated to both 12-bit (0-4096) and 14-bit (0-16383) resolutions for improved accuracy on analog readings.

Goals

The goals of this tutorials are:

• Update the ADC resolution to 12/14-bit.

Hardware & Software Needed

• Arduino IDE (online or offline)
• Arduino R4 WiFi
• Arduino Renesas Core

Analog-to-Digital Converter (ADC)

An analog-to-digital converter (ADC) transforms an analog signal to a digital one. The standard resolution on Arduino boards is set to 10-bit (0-1023). The UNO R4 WiFi supports up to 14-bit resolutions, which can provide a more precise value from analog signals.

To update the resolution, you will only need to use the analogReadResolution() command.

To use it, simply include it in your

setup()

analogRead()

Copy
1void setup(){
2  analogReadResolution(14); //change to 14-bit resolution
3}
4
5void loop(){
6  int reading = analogRead(A3); // returns a value between 0-16383
7}

Summary

This short tutorial show how to update the resolution for your ADC, a new feature available on the UNO R4 WiFi board.