INA169 Current Sensor Module

Overview

This module can solve the problems of monitoring the current. Instead of using multi-meters, INA169 can be used for both image and output DC current measurement analog offered. Analog output makes this module ideal for monitoring current.

Resistance measurement can operate at 2 W DC, so it can measure up to +5 A. The output is a current passing through a 10 k resistor, so the output voltage is 1 V on Amp. It can change the resistance value by cutting resistance through-hole resistors. If you add a resistance of 20 K, you will get 2 V per Amp and a resistance of 5 K will get 0.5 V per Amp.

A 5-pin module can be attached to your project with ease. It also has a 3.5 mm terminals for connecting/disconnecting.

This module is very easy to use, it is only necessary to connect a power supply between 2.7 V to 60 V, connect V + to V- from the positive supply and ground. Then measure the output using a multimeter.

Specifications

• Resistance: 0.1 ohm 1% 2 W
• Supply Voltage: 2.7 V to 60 V

Arduino code example

/*
Hardware connections:

Uno Pin INA169 Board Function

+5V VCC Power supply
GND GND Ground
A0 VOUT Analog voltage measurement

VIN+ and VIN- need to be connected inline with the positive
DC power rail of a load (e.g. an Arduino, an LED, etc.).

*/

// Constants
const int SENSOR_PIN = A0; // Input pin for measuring Vout
const int RS = 10; // Shunt resistor value (in ohms)
const int VOLTAGE_REF = 5; // Reference voltage for analog read

// Global Variables
float sensorValue; // Variable to store value from analog read
float current; // Calculated current value

void setup() {

// Initialize serial monitor
Serial.begin(9600);

}

void loop() {

// Read a value from the INA169 board
sensorValue = analogRead(SENSOR_PIN);

// Remap the ADC value into a voltage number (5V reference)
sensorValue = (sensorValue * VOLTAGE_REF) / 1023;

// Follow the equation given by the INA169 datasheet to
// determine the current flowing through RS. Assume RL = 10k
// Is = (Vout x 1k) / (RS x RL)
current = sensorValue / (10 * RS);

// Output value (in amps) to the serial monitor to 3 decimal
// places
Serial.print(current, 3);
Serial.println(" A");

// Delay program for a few milliseconds
delay(500);

}

For more details check the attached datasheet.

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