INA219 High Side DC Current Sensor Breakout - 26V ±3.2A Max - STEMMA QT

Rating:

100% of 100

SKU: ADA904 Brand: Adafruit

This breakout board will solve all your power-monitoring problems. Instead of struggling with two multimeters, you can just use the handy INA219B chip on this breakout...

$18.95 AUD, inc GST

$17.23 AUD, exc GST

In stock, ships same business day if ordered before 2PM
Delivered by Tue, 26th of Nov

Quantity Discounts:

10-25 $16.71 (exc GST)
25+ $16.36 (exc GST)

This breakout board will solve all your power-monitoring problems. Instead of struggling with two multimeters, you can just use the handy INA219 chip on this breakout to both measure both the high side voltage and DC current draw over I2C with ±1% precision.

Please Note: As of Sept 2022, due to the severe chip shortage, Adafruit have had to update this design to use either the INA219A or INA219B and in SOT-23 or SOIC package - whatever Adafruit are able to get on the market! The A version is ±1% total max current measurement error over the entire temp range (±0.5% max at 25*C) and the B version is ±0.5% total max current measurement error over the entire temp range (±0.3% max at 25*C). Overall functionality is otherwise the same.

Most current-measuring devices such as Adafruit's current panel meter are only good for low side measuring. That means that unless you want to get a battery involved, you have to stick the measurement resistor between the target ground and true ground. This can cause problems with circuits since electronics tend to not like it when the ground references change and move with varying current draw. This chip is much smarter - it can handle high side current measuring, up to +26VDC, even though it is powered with 3 or 5V. It will also report back that high side voltage, which is great for tracking battery life or solar panels.

A precision amplifier measures the voltage across the 0.1 ohm, 1% sense resistor. Since the amplifier maximum input difference is ±320mV this means it can measure up to ±3.2 Amps. With the internal 12 bit ADC, the resolution at ±3.2A range is 0.8mA. With the internal gain set at the minimum of div8, the max current is ±400mA and the resolution is 0.1mA. Advanced hackers can remove the 0.1 ohm current sense resistor and replace it with their own to change the range (say a 0.01 ohm to measure up 32 Amps with a resolution of 8mA)

Adafruit include a 6-pin header (so you can easily attach this sensor to a breadboard) as well as a 3.5mm terminal plug so you can easily attach and detach your load.

Usage is simple. Power the sensor itself with 3 to 5VDC and connect the two I2C pins up to your microcontroller. Then connect your target power supply to VIN+ and the load to ground to VIN-. Adafruit have a detailed tutorial that will do all the gain, range and math for you - just plug and go with Arduino or CircuitPython!

As if that weren't enough, Adafruit have now also added SparkFun qwiic compatible STEMMA QT connectors for the I2C bus so you don't even need to solder the I2C and power lines. Just wire up to your favorite micro using a STEMMA QT adapter cable. The Stemma QT connectors also mean the INA219 can be used with our various associated accessories. QT Cable is not included, but Adafruit have a variety in the shop.

Technical Details

Note: You may get an off-white or black JST connector.

Revision History:

As of January 29, 2021 - Adafruit have updated this sensor to Adafruit's STEMMA QT standard for sensors. There are now four mounting holes and two STEMMA QT connectors for plug-and-play connectivity! The schematic is the same; only the mechanical shape has changed.
As of Sept 22, 2022 - due to the severe chip shortage, Adafruit have had to update this design to use either the INA219A or INA219B and in SOT-23 or SOIC package - whatever Adafruit are able to get on the market! The A version is ±1% total max current measurement error over the entire temp range (±0.5% max at 25*C) and the B version is ±0.5% total max current measurement error over the entire temp range (±0.3% max at 25*C). Overall functionality is otherwise the same.

Specifications:

Datasheet, Fritzing, and EagleCAD PCB files available in the product tutorial
0.1 ohm 1% 2W current sense resistor
Up to +26V target voltage
Up to ±3.2A current measurement, with ±0.8mA resolution
Note: The terminal block included with your product may be blue or black. You may get an off-white or black JST connector.
This board/chip uses I2C 7-bit addresses 0x40, 0x41, 0x44, 0x45, selectable with jumpers

Product Dimensions: 25.6mm x 20.4mm x 4.7mm / 1.0" x 0.8" x 0.2"

This product is listed in:

Sensors>Current

Product Comments

Start the conversation

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

$3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
$7+ for Standard Post (typically 6+ business days, tracked)
$11+ for Express Post (typically 2+ business days, tracked)
Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

$12+ for Pack and Track (3+ days, tracked)
$16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!