Introduction
This Encoder adapter is especially designed for DFRobot 12V DC Motors. This adapter comprises an external pull-up resistor, which raises the output voltage when the transistor is turned off. This board has two build-in pull-up resistors.
Specification
- Compatible with open collector output encoder
- Size: 31x24mm
- Hall Sensor Voltage：5v
Encoder Diagram
Encoder Sample Code
/*
Pay attention to the interrupt pin,please check which microcontroller you use.
http://arduino.cc/en/Reference/AttachInterrupt
*/
//The sample code for driving one way motor encoder
const byte encoder0pinA = 2;//A pin -> the interrupt pin 2
const byte encoder0pinB = 4;//B pin -> the digital pin 4
byte encoder0PinALast;
int duration;//the number of the pulses
boolean Direction;//the rotation direction
void setup()
{
Serial.begin(57600);//Initialize the serial port
EncoderInit();//Initialize the module
}
void loop()
{
Serial.print("Pulse:");
Serial.println(duration);
duration = 0;
delay(100);
}
void EncoderInit()
{
Direction = true;//default -> Forward
pinMode(encoder0pinB,INPUT);
attachInterrupt(0, wheelSpeed, CHANGE);//int.0
}
void wheelSpeed()
{
int Lstate = digitalRead(encoder0pinA);
if((encoder0PinALast == LOW) && Lstate==HIGH)
{
int val = digitalRead(encoder0pinB);
if(val == LOW && Direction)
{
Direction = false; //Reverse
}
else if(val == HIGH && !Direction)
{
Direction = true; //Forward
}
}
encoder0PinALast = Lstate;
if(!Direction) duration++;
else duration--;
}