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// 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(1200);
}
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);
sensorValue = map(sensorValue,0,1023,0.000,6.000);
// 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");
}
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