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: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 //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 6 Months Warranty This item is covered with supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects. What voids warranty: If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way. SKU: PGI-0052700 Categories: Robocon, Rotary Encoders
