How many terminals does the rotary encoder have?

Interfacing of Sensors, Actuators, and Other Modules opics include: IR sensor, ultrasonic sensor, adxl335 accelerometer sensor, nokia 5110 graphical display module, gsr sensor, mpu6050 sensor module, ldr sensor, relay dual channel module, motor driver l293d, esp8266 wifi module, OV7076 camera module, oled display module, lm35 temperature and mq2 sensor module, rfid module, rotary encoder, thermistor, pir sensor module, thermocouple, soil moisture and dht11 sensor, zigbee and hc05 bluetooth modules. Here are some steps for interfacing sensors with Arduino: Connect the sensor's VCC pin to... Show more

Interfacing of Sensors, Actuators, and Other Modules opics include: IR sensor, ultrasonic sensor, adxl335 accelerometer sensor, nokia 5110 graphical display module, gsr sensor, mpu6050 sensor module, ldr sensor, relay dual channel module, motor driver l293d, esp8266 wifi module, OV7076 camera module, oled display module, lm35 temperature and mq2 sensor module, rfid module, rotary encoder, thermistor, pir sensor module, thermocouple, soil moisture and dht11 sensor, zigbee and hc05 bluetooth modules.

Here are some steps for interfacing sensors with Arduino:
Connect the sensor's VCC pin to Uno's 5V pin using a red male-to-female jumper cable
Connect the sensor's ground pin to Uno's ground pin using a black male-to-female jumper cable
Connect the sensor's out pin to Uno's digital pin 2 using a green male-to-female jumper cable 

Here are some steps for interfacing actuators with Arduino:
Connect the black wire from the servo to the GND pin on the Arduino
Connect the red wire from the servo to the +5V pin on the Arduino
Connect the yellow or white wire from the servo to a digital pin on the Arduino
Connect the red wire to proto board + line 

Here are some steps for wiring an actuator relay:
Connect the power supply to the VCC and GND pins located on the control side of the relay
On the same side, connect the corresponding microcontroller pins to the IN pins
On the relay side, focus on the three terminals
If the battery is connected to the IN pin (or the IN pin is free from any connection), use screws to connect the NC and COM relay terminals 

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