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Showing content from https://learn.sparkfun.com/tutorials/qwiic-12-bit-adc-hookup-guide below:

Qwiic 12-Bit ADC Hookup Guide

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An analog to digital converter (ADC) is very useful tool for converting an analog voltage to a digital signal that can be read by a microcontroller. The ability to converting from analog to digital interfaces allows users to use electronics to interface to interact with the physical world.

The SparkFun Qwiic (12-bit) ADC provides four channels of I²C controlled ADC input to your Qwiic enabled project. These four channels can be used as single-ended inputs, or in pairs for differential inputs. The ADS1015 uses its own internal voltage reference for measurements, but the ground and 3.3V power are also available on the pin outs for users.

Note: The maximum resolution of the converter is 12-bits in differential mode and 11-bits for single-ended inputs. Step sizes range from 125μV per count to 3mV per count depending on the full-scale range (FSR) setting.

The SparkFun Qwiic ADC does need a few additional items for you to get started; a Qwiic enabled microcontroller, a Qwiic cable, and jewelry/precision screwdrivers (with 1.5mm and 2.5mm flathead bits). You may already have a few of these items, so feel free to modify your cart based on your needs.

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If you're unfamiliar with analog to digital converters, jumper pads, or I²C be sure to checkout some of these foundational tutorials.

An introduction to I2C, one of the main embedded communications protocols in use today.

Handling PCB jumper pads and traces is an essential skill. Learn how to cut a PCB trace, add a solder jumper between pads to reroute connections, and repair a trace with the green wire method if a trace is damaged.

This tutorial covers the basic functionality of the RedBoard Qwiic. This tutorial also covers how to get started blinking an LED and using the Qwiic system.

For a background on analog circuitry, check out these tutorials:

Every electrical project starts with a circuit. Don't know what a circuit is? We're here to help.

Turn a large voltage into a smaller one with voltage dividers. This tutorial covers: what a voltage divider circuit looks like and how it is used in the real world.

A tutorial on all things resistors. What is a resistor, how do they behave in parallel/series, decoding the resistor color codes, and resistor applications.

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The Qwiic ADC utilizes the Qwiic connect system. We recommend familiarizing yourself with the Logic Levels and I²C tutorials before using it. Click on the banner above to learn more about our Qwiic products.

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