# Adafruit INA228 I2C Power Monitor
## Overview
The INA228 is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 20-bit (!) ADC for precision measurements from milliamp to Amp, and an I2C interface for easy configuration of alerts, oversampling, gain adjustments and more!
This breakout board may well be the last current sensing solution you ever need to buy. Not only can it do the work of two multimeters, but it can do it with amazing precision and flexibility. With it you can measure high or low side DC current, the bus voltage, and have it automatically calculate the power. It can do so over impressive voltage, current, and temperature ranges with better than 1% accuracy, all while delivering the data in an easy to use format over I2C.
Works great with any microcontroller that is CircuitPython or Arduino compatible, as well as single board computers such as the Raspberry Pi. It is compatible with 3V or 5V logic and can measure bus voltages up to +85VDC. **Note that it is not for use with AC voltages**.
Most current-measuring devices operate with some notable constraints that limit what they can be used for. Many are low-side only which can cause issues as the ground reference changes with current. Others like its little sister the INA219B avoid this by measuring on the high side but need to change their shunt resistor to measure different current ranges. The INA228 avoids these limitations, and with the precision 15 milliohm shunt resistor on board, it can be used to measure as much as **+85V** at up to **10A** (~10uA per LSB) or **2.75A** (~2.5uA per LSB) **Continuous** on either the _high or low side_. Wow!
The voltage across the integrated _15 milliohm (.015 ohms!)_, 0.1% shunt resistor is measured by the internal 20 bit ADC, allowing for measurements over the impressive current range with a resolution of 10uA per LSB in high current measurement mode or 2.5uA per LSB in low current measurement mode.
To measure low-side, connect **VIN-** to ground and **VIN+** to your load's lowest potential. **VBUS** should connect to the highest project voltage, up to 85V. To measure high-side, connect **VIN+** to **VBUS** to the highest project voltage, and **VIN-** to the load's highest potential. In high-side measurement, which is most common, you can simplify connecting **V+** to **VBUS** by soldering closed the back jumper.
This comes as a fully assembled breakout board with a 3.5mm terminal block and header. Some light soldering is required to attach the header for use in a breadboard.
- [Next Page](https://learn.adafruit.com/adafruit-ina228-i2c-power-monitor/pinouts.md)
## Primary Products
### Adafruit INA228 - I2C 85V, 20-bit High or Low Side Power Monitor
[Adafruit INA228 - I2C 85V, 20-bit High or Low Side Power Monitor](https://www.adafruit.com/product/5832)
The INA228 is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 20-bit (!) ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and...
In Stock
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[Related Guides to the Product](https://learn.adafruit.com/products/5832/guides)
## Featured Products
### STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long
[STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long](https://www.adafruit.com/product/4210)
This 4-wire cable is a little over 100mm / 4" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
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### STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long
[STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long](https://www.adafruit.com/product/4399)
This 4-wire cable is 50mm / 1.9" long and fitted with JST SH female 4-pin connectors on both ends. Compared with the chunkier JST PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
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### STEMMA QT / Qwiic JST SH 4-pin Cable with Premium Female Sockets
[STEMMA QT / Qwiic JST SH 4-pin Cable with Premium Female Sockets](https://www.adafruit.com/product/4397)
This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium female headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and...
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### STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable
[STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable](https://www.adafruit.com/product/4209)
This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium Dupont male headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert...
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### JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic
[JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic](https://www.adafruit.com/product/4398)
This cable will make it super easy to use our plug-and-play STEMMA QT boards with boards like Circuit Playground. On one end you get a Qwiic / STEMMA QT connector (technically known as a JST SH 4-pin plug) into 4 individual wires with grippy alligator clips. We're carrying these to...
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