- If you are running a Feather (3.3V), connect Feather 3V to board VIN
- If you are running a 5V Arduino (Uno, etc.), connect Arduino 5Vto board VIN
- Connect Feather or Arduino GND to board GND
- Connect Feather or Arduino SCL to board SCL
- Connect Feather or Arduino SDA to board SDA
- Connect Vin+ to supply for high side current sensing or to load ground for low side sensing.
- Connect Vin- to load for high side current sensing or to board ground for low side sensing
The final results should resemble the illustration above, showing an Adafruit Metro development board.
Install Adafruit_INA260 library
To begin reading sensor data, you will need to install the Adafruit_INA260 library (code on our github repository). It is available from the Arduino library manager so we recommend using that.
From the IDE open up the library manager...
Click the Manage Libraries ... menu item, search for Adafruit INA260, and select the Adafruit INA260 library and click Install:
Then follow the same process for the Adafruit BusIO library.
Example Code
The following example code is part of the standard library, but illustrates how you can retrieve sensor data from the INA260 for the Current, Voltage, and Power.
Load Demo
Open up File->Examples->Adafruit_INA260 Library->ina260_test and upload to your Arduino wired up to the sensor.
Additionally you will want to add code to turn the neopixel strip on so that there is some current to measure! If you're not familiar with using the NeoPixel library, please consult the excellent NeoPixel Überguide page on the subject.
Upload the sketch to your board and open up the Serial Monitor (Tools->Serial Monitor). You should see the the values for Current, Voltage, and Power.
#include <Adafruit_INA260.h>
Adafruit_INA260 ina260 = Adafruit_INA260();
void setup() {
Serial.begin(115200);
// Wait until serial port is opened
while (!Serial) { delay(10); }
Serial.println("Adafruit INA260 Test");
if (!ina260.begin()) {
Serial.println("Couldn't find INA260 chip");
while (1);
}
Serial.println("Found INA260 chip");
}
void loop() {
Serial.print("Current: ");
Serial.print(ina260.readCurrent());
Serial.println(" mA");
Serial.print("Bus Voltage: ");
Serial.print(ina260.readBusVoltage());
Serial.println(" mV");
Serial.print("Power: ");
Serial.print(ina260.readPower());
Serial.println(" mW");
Serial.println();
delay(1000);
}
You should get something resembling the following output when you open the Serial Monitor at 115200 baud:
First we include the library and create an Adafruit_INA260 object to use in the rest of the sketch.
#include <Adafruit_INA260.h> Adafruit_INA260 ina260 = Adafruit_INA260();
Next, in the setup we call the INA260 object's begin function to initialize the driver and prepare it to read measurements from the sensor.
The begin function will return false if it is unable to make a connection to an INA260 sensor. If this happens, double check your power and I2C wiring.
if (!ina260.begin()) {
Serial.println("Couldn't find INA260 chip");
while (1);
}
Finally we can take some readings! readCurrent, readBusVoltage, and readPower all read and return the given measurements in milliamps, millivolts, and milliwatts respectively.
Serial.print("Current: ");
Serial.print(ina260.readCurrent());
Serial.println(" mA");
Serial.print("Bus Voltage: ");
Serial.print(ina260.readBusVoltage());
Serial.println(" mV");
Serial.print("Power: ");
Serial.print(ina260.readPower());
Serial.println(" mW");
To get accurate measurements when calling readVoltage and readPower (for low-side sensing), you will need to cut the VB jumper on the right side of the breakout and connect the VBus pin to your bus.
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