Questo sensore di corrente fino a 20A è basato sull'integrato Allegro ACS712
Il modulo viene fornito completamente assemblato.
Fornisce in uscita una tensione proporzionale alla tensione misurata. (100mV per ogni A)
Corrente massima 20A
Versione integrato: ACS712T ELC-20T
Alimentazione 5V
Per il cablaggio occorre tenere conto che:
Il codice per gestirlo è il seguente
| int sensorValue;
void setup()
{
Serial.begin(9600); // sets the serial port to 9600
}
void loop()
{
sensorValue = analogRead(0); // read analog input pin 0
Serial.println(sensorValue, DEC); // prints the value read
delay(100); // wait 100ms for next reading
}
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Con questo integrato uso a volte anche questi altri codici
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/*
* FILE: MM01
* AUTHOR: Rob van den Tillaart; modified Ralph Martin
* DATE: 2012 06 10
* ORIGINAL URL: http://playground.arduino.cc/Code/HallEffect
*
* PURPOSE: use an A1301 or A1302 as magnetometer
*
* Pin Layout LH Package
* =====================
* 1 VCC 5V
* 2 signal connected to Analog 0
* 3 GND
*
* Pin Layout UA Package
* =====================
* 1 VCC 5V
* 2 GND
* 3 signal connected to Analog 0
*
*/
#define NOFIELD 505L // Analog output with no applied field, calibrate this
// Uncomment one of the lines below according to device in use A1301 or A1302
// This is used to convert the analog voltage reading to milliGauss
#define TOMILLIGAUSS 1953L // For A1301: 2.5mV = 1Gauss, and 1024 analog steps = 5V, so 1 step = 1953mG
// #define TOMILLIGAUSS 3756L // For A1302: 1.3mV = 1Gauss, and 1024 analog steps = 5V, so 1 step = 3756mG
void setup()
{
Serial.begin(9600);
}
void DoMeasurement()
{
// measure magnetic field
int raw = analogRead(0); // Range : 0..1024
// Uncomment this to get a raw reading for calibration of no-field point
// Serial.print("Raw reading: ");
// Serial.println(raw);
long compensated = raw - NOFIELD; // adjust relative to no applied field
long gauss = compensated * TOMILLIGAUSS / 1000; // adjust scale to Gauss
Serial.print(gauss);
Serial.print(" Gauss ");
if (gauss > 0) Serial.println("(South pole)");
else if(gauss < 0) Serial.println("(North pole)");
else Serial.println();
}
void loop()
{
delay(1000);
DoMeasurement();
}
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oppure questo
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#define NOFIELD 505L // Analog output with no applied field, calibrate this
// Uncomment one of the lines below according to device in use A1301 or A1302
// This is used to convert the analog voltage reading to milliGauss
// For A1301: 2.5mV = 1Gauss, and 1024 analog steps = 5V, so 1 step = 1953mG
// For A1302: 1.3mV = 1Gauss, and 1024 analog steps = 5V, so 1 step = 3756mG
#define TOMILLIGAUSS 1.953125
// #define TOMILLIGAUSS 3.756010
void setup()
{
Serial.begin(115200);
}
void loop()
{
float gauss = (analogRead(0) - NOFIELD) * TOMILLIGAUSS;
Serial.print(gauss, 2);
Serial.print(" Gauss ");
if (gauss > 0) Serial.println("(South pole)");
else if(gauss < 0) Serial.println("(North pole)");
else Serial.println();
delay(1000);
}
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