MAX 471 [EDC - Etudes de cas]

MAX 471

MAX471 Voltage Current Sensor⚓

http://www.himix.lt/arduino/arduino-and-voltage-current-measurement/ .

This module can be used to test the current and voltage.

The principle of voltage test based on principle of resistive voltage divider design, can make the red terminal connector input voltage to 5 times smaller. Arduino analog input voltages up to 5 v, the voltage detection module input voltage not greater than 5Vx5=25V (if using 3.3V systems, input voltage not greater than 3.3Vx5=16.5V). Arduino AVR chips have 10-bit AD, so this module simulates a resolution of 0.00489V (5V/1023), so the minimum voltage of input voltage detection module is 0.00489Vx5=0.02445V.

The MAX471 chip on the board used to test the consume current of the load.

Paramenter:

Test Voltage range: DC3 – 25V (Arduino work on 5V) or DC3 – 16.5V (Arduino work on 3.3V)

Test Current range: DC 0 – 3A

Code⚓

// Watch video here: https://www.youtube.com/watch?v=T4yyK0G9Zgg
/* Connection pins:
Arduino     Current Sensor B43
A0                  VT
A1                  AT
+5V                 VIN
+5V                 VOUT
GND                 GND
*/
#include <Wire.h>
#define VT_PIN A0 // connect VT
#define AT_PIN A1// connect AT
#define ARDUINO_WORK_VOLTAGE 5.0
void setup()
{
  Serial.begin(9600);
  Serial.println("Voltage (V) / Current (A)");
}
void loop()
{
  int vt_temp = analogRead(VT_PIN);
  int at_temp = analogRead(AT_PIN);
  double voltage = vt_temp * (ARDUINO_WORK_VOLTAGE / 1023.0) * 5;
  double current = at_temp * (ARDUINO_WORK_VOLTAGE / 1023.0);
  Serial.print("Analog0: "); Serial.print(vt_temp); Serial.print(" / "); Serial.print("Analog1: "); Serial.print(at_temp);  Serial.print(" ----- "); 
  Serial.print(voltage); Serial.print(" / "); Serial.println(current);
  delay(1000);
}

// Watch video here: https://www.youtube.com/watch?v=T4yyK0G9Zgg

/* Connection pins:

Arduino     Current Sensor B43
A0                  VT
A1                  AT
+5V                 VIN
+5V                 VOUT
GND                 GND
*/


#include <Wire.h>

#define VT_PIN A0 // connect VT
#define AT_PIN A1// connect AT

#define ARDUINO_WORK_VOLTAGE 5.0

void setup()
{
  Serial.begin(9600);
  Serial.println("Voltage (V) / Current (A)");
}

void loop()
{
  int vt_temp = analogRead(VT_PIN);
  int at_temp = analogRead(AT_PIN);

  double voltage = vt_temp * (ARDUINO_WORK_VOLTAGE / 1023.0) * 5;
  double current = at_temp * (ARDUINO_WORK_VOLTAGE / 1023.0);
  Serial.print("Analog0: "); Serial.print(vt_temp); Serial.print(" / "); Serial.print("Analog1: "); Serial.print(at_temp);  Serial.print(" ----- "); 
  Serial.print(voltage); Serial.print(" / "); Serial.println(current);
  delay(1000);
}