# Adafruit INA23x DC Current Voltage Power Monitor ## Overview ![ina237 and ina238 front view](https://cdn-learn.adafruit.com/assets/assets/000/137/463/medium800/adafruit_products_ina23xDouble.jpg?1749652594 ) Info: The INA237 and INA238 are completely code and hardware equivalent. The only difference is that the INA238 has better gain error and offset voltage than the INA237. The INA23x is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 16-bit ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and more! **The INA237 and INA238 are similar to the INA228, with the same:** - up to +85V high or low-side measurements - up to 10A or 2.75A - current, voltage and power measurements **However, unlike the INA228 the INA237 and INA238:** - has only 16-bit resolution, so 0.15mA or 42uA LSB rather than 10uA/2.5uA - the INA228 can measure energy/charge for you but the INA23x cannot - The INA237 has 0.3% gain error, ±50 µV max offset voltage compared to INA228's 0.05% gain error, ±1 µV - The INA238 has 0.1% gain error, ±5 µV max offset voltage compared to INA228's 0.05% gain error, ±1 µV ![back view of the board](https://cdn-learn.adafruit.com/assets/assets/000/137/302/medium800/adafruit_products_6340-04.jpg?1748875822 ) The  **INA237**  and  **INA238**  are completely code-equivalent, the **INA238** has better gain error and offset voltage than the **INA237** , at a slightly higher price. This breakout board may well be the last current sensing solution you every 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. ![terminal block side view of the breakout](https://cdn-learn.adafruit.com/assets/assets/000/137/303/medium800/adafruit_products_6340-00.jpg?1748875872 ) 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. **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 INA23x avoids these limitations, and with the precision 15milliohm shunt resistor on board, it can be used to measure as much as **+85V** at up to **10A ** (~0.15mA per LSB) or ** 2.75A** (~42uA per LSB) **Continuous** on either the _high or low side_. Wow! ![stemma view of the breakout](https://cdn-learn.adafruit.com/assets/assets/000/137/304/medium800/adafruit_products_6340-01.jpg?1748875927 ) The voltage across the integrated _15 milliohm (.015 ohms!)_, 0.1% shunt resistor is measured by the internal 16 bit ADC, allowing for measurements over the current range with a resolution of 0.15mA per LSB in high current measurement mode or 42uA per LSB in low current measurement mode. To measure low-side, Connect **VIN-** to ground and **VIN+** to your load's lowest potential. Cut the jumper on the back that connects VBUS to VIN+: **VBUS** should connect to the highest project voltage, up to 85V. To measure high-side, connect **VIN+** to the highest project voltage, and **VIN-** to the load's highest potential. In high-side measurement, which is most common, we simplify wiring by having a pre-connected jumper from **V+** to **VBUS**. ![front view with headers](https://cdn-learn.adafruit.com/assets/assets/000/137/305/medium800/adafruit_products_6340-03.jpg?1748876206 ) Usage is simple. Power the sensor itself with 3 to 5VDC and connect the two I2C pins to your microcontroller. Then connect your target power supply to VIN+ and the load to ground to VIN-. We have a detailed tutorial that will do all the gain, range, and math for you - just plug and go with [our Arduino library](https://github.com/adafruit/Adafruit_INA237_INA238)or CircuitPython! You can connect up to 4 sensors on one bus by soldering the address jumpers on the back. As if that weren't enough, we also added[SparkFun qwiic](https://www.sparkfun.com/qwiic)-compatible **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt)** connectors for the I2C bus, **so you don't even need to solder the I2C and power lines.** Simply wire up to your favorite micro using a [STEMMA QT adapter cable.](https://www.adafruit.com/?q=stemma%20qt%20cable) The Stemma QT connectors also mean the INA237 can be used with our [various associated accessories.](https://www.adafruit.com/?q=JST%20SH%204) [QT Cable is not included, but we have a variety in the shop](https://www.adafruit.com/?q=stemma+qt+cable&sort=BestMatch). 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. # Adafruit INA23x DC Current Voltage Power Monitor ## Pinouts ![front and back view of the breakout](https://cdn-learn.adafruit.com/assets/assets/000/137/318/medium800/adafruit_products_double.jpg?1748967612 ) Info: The INA237 and INA238 are completely code and hardware equivalent. The only difference is that the INA238 has better gain error and offset voltage than the INA237. The default I2C address is **0x40**. ## Power Pins - **VIN**  - this is the power pin. It can be powered by 3V or 5V. Give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V. - **GND**  - common ground for power and logic. ## I2C Logic Pins - **SCL** - I2C clock pin, connect to your microcontroller's I2C clock line. This pin can use 3-5V logic, and there's a **10K pullup** on this pin. - **SDA** - I2C data pin, connect to your microcontroller's I2C data line. This pin can use 3-5V logic, and there's a **10K pullup** on this pin. - **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt) -** These connectors allow you to connect to development boards with **STEMMA QT** (Qwiic) connectors or to other things with [various associated accessories](https://www.adafruit.com/?q=JST%20SH%204). ## Input Pins The pins are in a low side measurement configuration by default. They are available along the bottom edge of the board and the terminal block on the top edge of the board. - **VIN+** - Positive input pin. - **VIN-** - Negative input pin. - **VBUS** - Bus voltage input pin. To measure high-side, connect **VIN+****   **to the highest project voltage, and** VIN- **to the load's highest potential. The** VBUS jumper **connects** VIN+ **and** VBUS** together by default for high-side measurements. To measure low-side, **cut the VBUS jumper**. Then, connect **VIN-** to ground and **VIN+** to your load's lowest potential. **VBUS** should connect to the highest project voltage, up to 85V. ## VBUS Jumper On the back of the board, above the **VIN+** and **VBUS** terminal block pins, is the  **VBUS jumper**. This jumper connects or disconnects **VBUS** from **VIN+**. When the jumper is closed (default), it configures the board for high side measurement. When the jumper is cut, it configures the board for low side measurement.  ## Interrupt Pin - **ALRT** - The alert/interrupt pin. The default state is active low. ## Power LED - **Power LED -** In the upper left corner, above the STEMMA connector, on the front of the board, is the power LED, labeled **on**. It is the green LED. ## Address Jumpers On the back of the board are **two address jumpers** , labeled **A0** and **A1** , above the **Addr** label on the board silk. These jumpers allow you to chain up to 4 of these boards on the same pair of I2C clock and data pins. To do so, you solder the jumpers "closed" by connecting the two pads. This pulls the pin high. The default I2C address is **0x40**. The table below shows all possible addresses, and whether the pin(s) should be high (closed) or low (open). ![i2c address table](https://cdn-learn.adafruit.com/assets/assets/000/137/898/medium800/adafruit_products_Screenshot_2025-06-19_125504.png?1750352120 ) # Adafruit INA23x DC Current Voltage Power Monitor ## CircuitPython and Python It's easy to use the **INA23x** with Python or CircuitPython, and the [Adafruit\_CircuitPython\_INA23x](https://github.com/adafruit/Adafruit_CircuitPython_INA23x) module. This module allows you to easily write Python code to monitor high or low side power measurements. You can use this driver with any CircuitPython microcontroller board or with a computer that has GPIO and Python [thanks to Adafruit\_Blinka, our CircuitPython-for-Python compatibility library](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux). Info: The INA237 and INA238 are completely code and hardware equivalent. The only difference is that the INA238 has better gain error and offset voltage than the INA237. ## CircuitPython Microcontroller Wiring First wire up the monitor to your board exactly as follows. The following is the monitor wired to a Feather RP2040 using the STEMMA connector for high side monitoring: - **Board STEMMA 3V** to **breakout **** VIN (red wire)** - **Board STEMMA GND** to **breakout**  **GND (black wire)** - **Board STEMMA SCL** to **breakout**  **SCL (yellow wire)** - **Board STEMMA SDA** to **breakout**  **SDA (blue wire)** - **Breakout Vin-** to **load's highest potential (yellow wire)** - **Breakout Vin+** to **highest project voltage (red wire)** ![fritzing diagram with a feather rp2040 and ina237](https://cdn-learn.adafruit.com/assets/assets/000/137/377/medium640/adafruit_products_feather_stemma_bb.jpg?1749483961) Here is the monitor wired to a Feather RP2040 using a solderless breadboard for high side monitoring: - **Board 3V** to **breakout **** VIN (red wire)** - **Board GND** to **breakout**  **GND (black wire)** - **Board SCL** to **breakout**  **SCL (yellow wire)** - **Board SDA** to **breakout**  **SDA (blue wire)** - **Breakout Vin-** to **load's highest potential (yellow wire)** - **Breakout Vin+** to **highest project voltage (red wire)** ![fritzing diagram with a feather and ina237](https://cdn-learn.adafruit.com/assets/assets/000/137/378/medium640/adafruit_products_feather_bb_bb.jpg?1749484009) For low side monitoring, you'll need to **cut the VBus jumper** on the back of the breakout and use this wiring: - **Board STEMMA 3V** to **breakout **** VIN (red wire)** - **Board STEMMA GND** to **breakout**  **GND (black wire)** - **Board STEMMA SCL** to **breakout**  **SCL (yellow wire)** - **Board STEMMA SDA** to **breakout**  **SDA (blue wire)** - **Breakout Vin-** to **GND (black wire)** - **Breakout VBus** to **highest potential voltage (red wire)** - **Breakout Vin+** to **load's lowest potential (yellow wire)** ![fritzing with feather for low side monitoring](https://cdn-learn.adafruit.com/assets/assets/000/137/464/medium640/adafruit_products_featherLowSide_stemma_bb.jpg?1749653478) ## Python Computer Wiring Since there are _dozens_ of Linux computers/boards you can use, we will show wiring for Raspberry Pi. For other platforms, [please visit the guide for CircuitPython on Linux to see whether your platform is supported](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux). Here's the Raspberry Pi wired with I2C using the STEMMA connector for high side monitoring: - **Pi 3.3V** to **breakout **** VIN (red wire)** - **Pi GND** to **breakout**  **GND (black wire)** - **Pi SCL** to **breakout**  **SCL (yellow wire)** - **Pi SDA** to **breakout**  **SDA (blue wire)** - **Breakout Vin-** to **load's highest potential (yellow wire)** - **Breakout Vin+** to **highest project voltage (red wire)** ![raspberry pi fritzing diagram](https://cdn-learn.adafruit.com/assets/assets/000/137/405/medium640/adafruit_products_piStemma_bb.jpg?1749567434) Here's the wiring using a solderless breadboard for high side monitoring: - **Pi 3.3V** to **breakout **** VIN (red wire)** - **Pi GND** to **breakout**  **GND (black wire)** - **Pi SCL** to **breakout**  **SCL (yellow wire)** - **Pi SDA** to **breakout**  **SDA (blue wire)** - **Breakout Vin-** to **load's highest potential (yellow wire)** - **Breakout Vin+** to **highest project voltage (red wire)** ![raspberry pi fritzing diagram](https://cdn-learn.adafruit.com/assets/assets/000/137/406/medium640/adafruit_products_piBB_bb.jpg?1749567463) For low side monitoring, you'll need to **cut the VBus jumper** on the back of the breakout and use this wiring: - **Pi 3.3V** to **breakout **** VIN (red wire)** - **Pi GND** to **breakout**  **GND (black wire)** - **Pi SCL** to **breakout**  **SCL (yellow wire)** - **Pi SDA** to **breakout**  **SDA (blue wire)** - **Breakout VIN-** to **GND (black wire)** - **Breakout VBUS** to **highest potential voltage (red wire)** - **Breakout VIN+** to **load's lowest potential (yellow wire)** ![fritzing diagram with a raspberry pi for low side monitoring](https://cdn-learn.adafruit.com/assets/assets/000/137/465/medium640/adafruit_products_piLowSide_stemma_bb.jpg?1749653528) ## Python Installation of INA23x Library You'll need to install the **Adafruit\_Blinka** library that provides the CircuitPython support in Python. This may also require enabling I2C on your platform and verifying you are running Python 3. [Since each platform is a little different, and Linux changes often, please visit the CircuitPython on Linux guide to get your computer ready](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux)! Once that's done, from your command line run the following command: - `pip3 install adafruit-circuitpython-ina23x` If your default Python is version 3 you may need to run 'pip' instead. Just make sure you aren't trying to use CircuitPython on Python 2.x, it isn't supported! ## CircuitPython Usage To use with CircuitPython, you need to first install the **Adafruit\_CircuitPython\_INA23x** library, and its dependencies, into the **lib** folder on your **CIRCUITPY** drive. Then you need to update **code.py** with the example script. Thankfully, we can do this in one go. In the example below, click the **Download Project Bundle** button below to download the necessary libraries and the **code.py** file in a zip file. Extract the contents of the zip file, and copy the **entire** **lib** **folder** and the **code.py** file to your **CIRCUITPY** drive. Your **CIRCUITPY/lib** folder should contain the following folders and file: - **adafruit\_bus\_device/** - **adafruit\_register/** - **adafruit\_ina228.mpy** - **adafruit\_ina23x.mpy** ![CIRCUITPY drive](https://adafruit.github.io/Adafruit_CircuitPython_Bundle/ina23x_ina23x_simpletest.py.png ) ## Python Usage Once you have the library `pip3` installed on your computer, copy or download the following example to your computer, and run the following, replacing **code.py** with whatever you named the file: `python3 code.py` ## Example Code **If running CircuitPython:** Once everything is saved to the **CIRCUITPY** drive, [connect to the serial console](https://learn.adafruit.com/welcome-to-circuitpython/kattni-connecting-to-the-serial-console) to see the data printed out! **If running Python:** The console output will appear wherever you are running Python. https://github.com/adafruit/Adafruit_CircuitPython_INA23x/blob/main/examples/ina23x_simpletest.py First, the sensor is instantiated over I2C. Then, in the loop, the measurements for current, bus voltage, shunt voltage, power and temperature are printed to the serial console. ![circuitpython serial console output](https://cdn-learn.adafruit.com/assets/assets/000/137/403/medium800/adafruit_products_Screenshot_2025-06-09_141816.png?1749493124 ) # Adafruit INA23x DC Current Voltage Power Monitor ## Python Docs # Adafruit INA23x DC Current Voltage Power Monitor ## Arduino Using the INA23x breakout with Arduino involves wiring up the breakout to your Arduino-compatible microcontroller, installing the [Adafruit\_INA237\_INA238](https://github.com/adafruit/Adafruit_INA237_INA238) library, and running the provided example code. Info: The INA237 and INA238 are completely code and hardware equivalent. The only difference is that the INA238 has better gain error and offset voltage than the INA237. ## Wiring Wire as shown for a **5V** board like an Uno. If you are using a **3V** board, like an Adafruit Feather, wire the board's 3V pin to the power monitor VIN. Here is an Adafruit Metro wired up to the breakout using the STEMMA QT connector for high side monitoring: - **Board 5V** to **breakout **** VIN (red wire)** - **Board GND** to **breakout**  **GND (black wire)** - **Board SCL** to **breakout**  **SCL (yellow wire)** - **Board SDA** to **breakout**  **SDA (blue wire)** - **Breakout Vin-** to **load's highest potential (yellow wire)** - **Breakout Vin+** to **highest project voltage (red wire)** ![fritzing diagram with a metro and the ina237](https://cdn-learn.adafruit.com/assets/assets/000/137/367/medium640/adafruit_products_metroSTEMMA_bb.jpg?1749480222) Here is an Adafruit Metro wired up using a solderless breadboard for high side monitoring: - **Board 5V** to **breakout **** VIN (red wire)** - **Board GND** to **breakout**  **GND (black wire)** - **Board SCL** to **breakout**  **SCL (yellow wire)** - **Board SDA** to **breakout**  **SDA (blue wire)** - **Breakout Vin-** to **load's highest potential (yellow wire)** - **Breakout Vin+** to **highest project voltage (red wire)** ![fritzing diagram with a metro and the INA237](https://cdn-learn.adafruit.com/assets/assets/000/137/369/medium640/adafruit_products_metroBB_bb.jpg?1749480269) For low side monitoring, you'll need to **cut the VBus jumper** on the back of the breakout and use this wiring: - **Board 5V** to **breakout **** VIN (red wire)** - **Board GND** to **breakout**  **GND (black wire)** - **Board SCL** to **breakout**  **SCL (yellow wire)** - **Board SDA** to **breakout**  **SDA (blue wire)** - **Breakout VIN-** to **GND (black wire)** - **Breakout VBUS** to **highest potential voltage (red wire)** - **Breakout VIN+** to **load's lowest potential (yellow wire)** ![fritzing diagram with a metro showing low side monitoring](https://cdn-learn.adafruit.com/assets/assets/000/137/466/medium640/adafruit_products_metroLowSide_stemma_bb.jpg?1749653723) ## Library Installation You can install the **Adafruit\_INA237\_INA238** library for Arduino using the Library Manager in the Arduino IDE. ![arduino ide menu](https://cdn-learn.adafruit.com/assets/assets/000/137/338/medium800/adafruit_products_Arduino_Open_Library_Manager.png?1749066126 ) Click the **Manage Libraries ...** menu item, search for **Adafruit\_INA237\_INA238** , and select the **Adafruit INA237 INA238** library: ![ina237 ina238 library install](https://cdn-learn.adafruit.com/assets/assets/000/137/339/medium800/adafruit_products_Screenshot_2025-06-04_154337.png?1749066257 ) If asked about dependencies, click "Install all". ![library dependencies ina237 ina238](https://cdn-learn.adafruit.com/assets/assets/000/137/340/medium800/adafruit_products_Screenshot_2025-06-04_154347.png?1749066287 ) If the "Dependencies" window does not come up, then you already have the dependencies installed. Warning: If the dependencies are already installed, you must make sure you update them through the Arduino Library Manager before loading the example! ## INA237 Example Code If you're using the INA237 breakout, use this example code: https://github.com/adafruit/Adafruit_INA237_INA238/blob/main/examples/ina237_test/ina237_test.ino ## INA238 Example Code If you're using the INA238 breakout, use this example code: https://github.com/adafruit/Adafruit_INA237_INA238/blob/main/examples/ina238_test/ina238_test.ino Upload the sketch to your board and open up the Serial Monitor ( **Tools -\> Serial Monitor** ) at 115200 baud. You'll see the INA237 or INA238 recognized over I2C. Then, your connected project's current, bus voltage, shunt voltage and power are printed out every second, along with the INA23x's temperature reading in Celsius. ![serial output from the ina238](https://cdn-learn.adafruit.com/assets/assets/000/137/365/medium800/adafruit_products_Screenshot_2025-06-09_091235.png?1749474804 ) # Adafruit INA23x DC Current Voltage Power Monitor ## Arduino Docs # Adafruit INA23x DC Current Voltage Power Monitor ## WipperSnapper ![](https://cdn-learn.adafruit.com/assets/assets/000/139/268/medium800/adafruit_products_i9XJ9h5dS0.png?1756482038) ## What is WipperSnapper WipperSnapper is a firmware designed to turn any WiFi-capable board into an Internet-of-Things device without programming a single line of code. WipperSnapper connects to [Adafruit IO](https://io.adafruit.com/), a web platform designed ([by Adafruit!](https://www.adafruit.com/about)) to _display_, _respond_, and _interact_ with your project's data. Simply load the WipperSnapper firmware onto your board, add credentials, and plug it into power. Your board will automatically register itself with your Adafruit IO account. From there, you can add _components_ to your board such as buttons, switches, potentiometers, sensors, and more! Components are _dynamically _added to hardware, so you can immediately start interacting, logging, and streaming the data your projects produce without writing code. If you've never used WipperSnapper, click below to read through the quick start guide before continuing. [Quickstart: Adafruit IO WipperSnapper](https://learn.adafruit.com/quickstart-adafruit-io-wippersnapper) ## Wiring First, wire up an INA23x (INA237/INA238) to your board exactly as follows. You can use a [Stemma QT cable](https://www.adafruit.com/product/4210) to make wiring the boards together easier if you prefer, but here is an example of the INA23x wired to an [Adafruit ESP32 Feather V2](https://www.adafruit.com/product/5400) using I2C via [Dupont Jumper Wires](https://www.adafruit.com/search?q=jumper+wires) mounted in one of our [prototyping breadboards](https://www.adafruit.com/product/4539): - **Board 3V**  to  **breakout **** VIN (red wire)** - **Board GND**  to  **breakout**  **GND (black wire)** - **Board SCL**  to  **breakout**  **SCL (yellow wire)** - **Board SDA**  to  **breakout**  **SDA (blue wire)** - **Breakout Vin-**  to **load's highest potential (yellow wire)** - **Breakout Vin+**  to **highest project voltage (red wire)** If you wish to measure the low-side of your load/circuit, instead of the high-side, then follow the low-side instructions on this guides [Arduino](https://learn.adafruit.com/adafruit-ina237-dc-current-voltage-power-monitor/arduino#step-3200109) page. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/269/medium640/adafruit_products_feather_bb_bb.png?1756482790) ## Usage Connect your board to Adafruit IO Wippersnapper and **[navigate to the WipperSnapper board list](https://io.adafruit.com/wippersnapper).** On this page, **select the WipperSnapper board you're using** to be brought to the board's interface page. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/271/medium800/adafruit_products_6ZLJuRJ2ST.png?1756482880) If you do not see your board listed here - you need [to connect your board to Adafruit IO](https://learn.adafruit.com/quickstart-adafruit-io-wippersnapper) first. On the device page, quickly  **check that you're running the latest version of the WipperSnapper firmware**  and that your device is Online. The device tile on the left indicates the version number of the firmware running on the connected board. - **If the firmware version is green with a checkmark -**  continue with this guide. - **If the firmware version is red with an exclamation mark "!" -**  [update to the latest WipperSnapper firmware](https://learn.adafruit.com/quickstart-adafruit-io-wippersnapper) on your board before continuing. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/273/medium640/adafruit_products_ymGdv0mTjv.png?1756483001) ![](https://cdn-learn.adafruit.com/assets/assets/000/139/274/medium640/adafruit_products_AalPuHDdoQ.png?1756483058) Next, make sure the sensor is plugged into your board and click the ** I2C Scan ** button. ![](https://cdn-learn.adafruit.com/assets/assets/000/113/177/medium800/sensor_page_crop_scan.png?1657724520) You should see the INA23x's default I2C address of `0x40` pop-up in the I2C scan list. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/275/medium800/adafruit_products_Screenshot_2025-08-22_210436.png?1756483121) ### I don't see the sensor's I2C address listed! First, double-check the connection and/or wiring between the sensor and the board. Then, reset the board and let it re-connect to Adafruit IO WipperSnapper. With the sensor detected in an I2C scan, you're ready to add the sensor to your board. **Click the New Component button or the + button** to bring up the component picker. ![](https://cdn-learn.adafruit.com/assets/assets/000/127/931/medium800/sensor_page_temperature___humidity_06_AddComponent.png?1708631009) Adafruit IO supports a large amount of components. To quickly find your sensor, type `INA23` into the search bar, then select the **INA237** or **INA238** component. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/276/medium800/adafruit_products_q5XFWfSk8c.png?1756483283) On the component configuration page, the INA23x's sensor address should be listed along with the sensor's settings. The  **Send Every**  option is specific to each sensor's measurements. This option will tell the Feather how often it should read from the INA23x sensor and send the data to Adafruit IO. Measurements can range from every 30 seconds to every 24 hours. For this example, set the  **Send Every ** interval to every 30 seconds. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/277/medium800/adafruit_products_42aeoOWAxc.png?1756483406) Your device interface should now show the sensor components you created. After the interval you configured elapses, WipperSnapper will automatically read values from the sensor(s) and send them to Adafruit IO. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/278/medium800/adafruit_products_Screenshot_2025-08-29_170345.png?1756483438) To view the data that has been logged from the sensor, click on the graph next to the sensor name. ![](https://cdn-learn.adafruit.com/assets/assets/000/139/279/medium800/adafruit_products_Screenshot_2025-08-29_170345.png?1756483508) Here you can see the feed history and edit things about the feed such as the name, privacy, webhooks associated with the feed and more. If you want to learn more about how feeds work, [check out this page](https://learn.adafruit.com/all-the-internet-of-things-episode-four-adafruit-io/advanced-feeds). ![](https://cdn-learn.adafruit.com/assets/assets/000/139/281/medium800/adafruit_products_WC5IQiS4Lo.png?1756483607) # Adafruit INA23x DC Current Voltage Power Monitor ## Downloads Info: The INA237 and INA238 are completely code and hardware equivalent. The only difference is that the INA238 has better gain error and offset voltage than the INA237. They have the same pinout, layout, wiring, and schematic! ## Files - [INA23x Datasheet](https://cdn-learn.adafruit.com/assets/assets/000/137/300/original/ina237.pdf?1748875460) - [EagleCAD PCB Files on GitHub](https://github.com/adafruit/Adafruit-INA237-Power-Monitor-PCB) - [3D models on GitHub](https://github.com/adafruit/Adafruit_CAD_Parts/tree/main/6340%20INA237%20Power%20Monitor) - [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library/blob/master/parts/Adafruit%20INA237%2085V%2010A%2016-bit%20DC%20Current%20Voltage%20Power%20Monitor%20-%20STEMMA%20QT.fzpz) ## Schematic and Fab Print ![schematic for ina237](https://cdn-learn.adafruit.com/assets/assets/000/137/298/medium800/adafruit_products_schem.png?1748875372 ) ![fab print for pcb](https://cdn-learn.adafruit.com/assets/assets/000/137/299/medium800/adafruit_products_fab.png?1748875389 dimensions are in inches) ![](https://cdn-learn.adafruit.com/assets/assets/000/137/317/medium800/adafruit_products_6340-INA237-Power-Monitor.jpg?1748963978 ) ## Primary Products ### Adafruit INA237 85V 10A 16-bit DC Current Voltage Power Monitor [Adafruit INA237 85V 10A 16-bit DC Current Voltage Power Monitor](https://www.adafruit.com/product/6340) The INA237 is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 16-bit ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and... In Stock [Buy Now](https://www.adafruit.com/product/6340) [Related Guides to the Product](https://learn.adafruit.com/products/6340/guides) ### Adafruit INA238 DC Current Voltage Power Monitor [Adafruit INA238 DC Current Voltage Power Monitor](https://www.adafruit.com/product/6349) The INA238 is an amazing power monitoring chip, with best-of-everything support: up to 85VDC common-mode, high or low side measurements, 16-bit ADC for precision measurements from milliamp to Amp, and I2C interface for easy configuration of alerts, oversampling, gain adjustments and... In Stock [Buy Now](https://www.adafruit.com/product/6349) [Related Guides to the Product](https://learn.adafruit.com/products/6349/guides) ## Related Guides - [Internet of Things Printer](https://learn.adafruit.com/internet-of-things-printer.md) - [Adafruit Audio BFF](https://learn.adafruit.com/adafruit-audio-bff.md) - [Adafruit CH9328 UART to HID Keyboard Breakout](https://learn.adafruit.com/adafruit-ch9328-uart-to-hid-keyboard-breakout.md) - [Using LoraWAN and The Things Network with CircuitPython](https://learn.adafruit.com/using-lorawan-and-the-things-network-with-circuitpython.md) - [Adafruit VCNL4020 Proximity and Light Sensor](https://learn.adafruit.com/adafruit-vcnl4020-proximity-and-light-sensor.md) - [Adafruit STSPIN220 Stepper Motor Driver Breakout Board](https://learn.adafruit.com/adafruit-stspin220-stepper-motor-driver-breakout-board.md) - [MIDI Laser Harp with Time of Flight Distance Sensors](https://learn.adafruit.com/midi-laser-harp-time-of-flight-sensors.md) - [Contribute to the Adafruit Learning System with Git and GitHub](https://learn.adafruit.com/contribute-to-the-adafruit-learning-system-with-git-and-github.md) - [Return to The Matrix with the Metro RP2350 or Fruit Jam](https://learn.adafruit.com/return-to-the-matrix-with-the-metro-rp2350.md) - [Using Raspberry Pi Pico and Pico 2 with Arduino](https://learn.adafruit.com/using-raspberry-pi-pico-pico-2-with-arduino.md) - [Adafruit LSM6DS3TR-C + LIS3MDL - Precision 9 DoF IMU](https://learn.adafruit.com/adafruit-lsm6ds3tr-c-lis3mdl-precision-9-dof-imu.md) - [Adafruit QT 5V to 3V Shifter Breakout](https://learn.adafruit.com/adafruit-qt-5v-to-3v-shifter-breakout.md) - [Adafruit Wii Nunchuck Breakout Adapter](https://learn.adafruit.com/adafruit-wii-nunchuck-breakout-adapter.md) - [Adafruit PCA9685 16-Channel Servo Driver](https://learn.adafruit.com/16-channel-pwm-servo-driver.md) - [PyRuler Video Conference Panic Buttons](https://learn.adafruit.com/pyrulervideopanic.md)