For this experiment, 2 10Ω resistors, an LED, an ADK Arduino, the INA169 current sensor, and a breadboard were used. The resistors and LED are connected in series with VIN- from the current sensor connected to the high side of the resistor. The circuit and the GND pin from the current sensor uses the ground pin from the Arduino as their reference ground. The 5V from the Arduino is used to power the current sensor by connecting itself to the VCC pin and is used as the input by being connected to VIN+.  Vout of the current sensor is used as an input to A0, so that the Arduino can use Vout to calculate the current of the resistor. The code below will calculate the current with the INA169 with RL= 10 kOhms and Rs= .11 Ohms. To verify whether the reading from the current sensor is accurate, a multimeter is connected in series with the resistor to verify that the reading from the arduino matches the reading from the multimeter.

/*
const int SENSOR_PIN = A0; // Input pin for measuring Vout
const int RS = .11; // Shunt resistor value (in ohms)
const int VOLTAGE_REF = 5; // Reference voltage for analog read
float sensorValue; // Variable to store value from analog read
float current; // Calculated current
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. RL = 10k
 // Is = (Vout x 1k) / (RS x RL) reduces to Is=Vout/(10*RS)
 current = sensorValue / (10 * RS);
// Output value (in amps) to the serial monitor to 3 decimal
 Serial.print(current, 4);
 Serial.println("A");
// Delays program for half a second
 delay(500);
}

Figure 2: Implementation of the Fritzing Diagram.

This was the circuit was created based on Figure 1. The wiring is different because the current sensor used had female headers as opposed to the male headers in Figure 1.

Figure 3: Measurement of the current from a multimeter.

The reading of the current through the surface using a multimeter. The reading from the multimeter will be used as a reference for the reading from the arduino. Reading is .253Amps.

Figure 4: Reading from Current Sensor

Serial monitor output which is the reading the Arduino calculates. It gives the current in Amps and can be used with the reading from the multimeter to verify that current sensor gives accurate reading.