A rotary encoder is a type of position sensor which is used for determining the angular position of a rotating shaft. It generates an electrical signal, either analog or digital, according to the rotational movement.
This is a 100PPR resolution optical encoder with quadrature outputs for increment counting. It will give 400 transitions per rotation between outputs A and B. A quadrature decoder is required to convert the pulses to an up count. The Encoder is build to Industrial grade.
The Encoder comes with Standard 1.5 m cable length which can be extended with extra cable if needed.
Note:
- Consider Adding Pull up resistor to both A and B phase of the encoder output to avoid the effect of interference in output and get the precise logical output value from encoder
- Also adding pull up resistor to all phase output line protects the open collector output-triode from damage due to direct Vcc supply short circuit.
Power and Input Terminal Assignments:
| Terminal Name | Wire Color | Description |
| Phase A | White | Quadrature encoded output A |
| Phase B | Green | Quadrature encoded output B |
| VCC | Red | VCC should be connected to +ve 5V of supply |
| GND | Black | Ground should be connected to negative of supply |
| Shield | Golden | Shield should be connected to GND |
Shielding is important. At a minimum, the cable should be protected either by a foil jacket with a drain wire or by a braided-wire shield that is grounded. For very sensitive applications or high-EMI environments, foil jacketed wires in combination with an overall braided-wire shield around the cable should be used to avoid the interference and precise encoder output.
Output: NPN open collector
Features :
- High cost-efficient advantages.
- Incremental rotary encoder internal adopts ASIC devices
- High reliability, long life
- Anti-jamming performance
- Small size, lightweight, compact structure
- Easy installation
- Stainless steel shaft, High resolution, High quality, line interface with waterproof protection
Tutorial Code:
//these pins can not be changed 2/3 are special pins
int encoderPin1 = 2;
int encoderPin2 = 3;
volatile int lastEncoded = 0;
volatile long encoderValue = 0;
long lastencoderValue = 0;
int lastMSB = 0;
int lastLSB = 0;
void setup() {
Serial.begin (9600);
pinMode(encoderPin1, INPUT);
pinMode(encoderPin2, INPUT);
digitalWrite(encoderPin1, HIGH); //turn pullup resistor on
digitalWrite(encoderPin2, HIGH); //turn pullup resistor on
//call updateEncoder() when any high/low changed seen
//on interrupt 0 (pin 2), or interrupt 1 (pin 3)
attachInterrupt(0, updateEncoder, CHANGE);
attachInterrupt(1, updateEncoder, CHANGE);
}
void loop(){
//Do stuff here
Serial.println(encoderValue);
delay(1000); //just here to slow down the output, and show it will work even during a delay
}
void updateEncoder(){
int MSB = digitalRead(encoderPin1); //MSB = most significant bit
int LSB = digitalRead(encoderPin2); //LSB = least significant bit
int encoded = (MSB << 1) |LSB; //converting the 2 pin value to single number
int sum = (lastEncoded << 2) | encoded; //adding it to the previous encoded value
if(sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++;
if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue --;
lastEncoded = encoded; //store this value for next time
}
Package Includes :
1 x Orange 100 PPR 2-Phase Incremental Optical Rotary Encoder
4 x 4.7KΩ Resistors for pull-ups
1 x Mounting Screw Set
mil_121 (verified owner) –
good product.
mil_121 –
Nikhilkarthik (verified owner) –
Sir i have a problem in coding, You have not cleared the coding on encoded pin MSB and LSB. The problems on codings should be verified and the encoder is perfect. Im happy with the product
Nikhilkarthik –