INA169 Breakout Board Hookup Guide

Contributors: ShawnHymel



Have a project where you want to measure the current draw? Need to carefully monitor low current through an LED? The INA169 is the chip for you!

INA169 Current Sense Breakout Board

The INA169 is a “high-side current monitor,” which means that you place a resistor (a “shunt resistor”) on the positive power rail and the INA169 measures the voltage drop across that resistor. The INA169 outputs a small current based on the measured voltage drop. If you place a resistor from the output of the INA169 to ground, you can measure the voltage at the output. With some basic math, the output voltage gives you the current through the shunt resistor.

Covered In This Tutorial

In this tutorial, we cover how the board should be used. The Board Overview section covers some theory and math on how the current sensing works, so feel free to skip to the Hookup Example if you just want to see the board in action. The Hookup Example shows how to connect the board to an Arduino in order to measure the current through an LED, and the Example Code provides a quick Arduino sketch for displaying the measured current to the Serial Monitor.

Required Materials

Suggested Reading

Want more information about SparkFun's classes? Interested in getting involved with teaching electronics? Just want to talk? Sign up for our newsletter, or contact our education department.

SparkFun is a company built around one core idea – sharing ingenuity. We think everyone should have the hardware and resources to learn and play with cool electronic gadgetry.

Share, give, learn, SparkFun.

Do you regularly instruct classes and workshops in a formal or informal learning environment? SparkFun offers Educator Discounts to people teaching and sharing electronics.

Find out more.