The characteristics of this motor are as follows:

• Mabuchi Motor, a first-line brand of micro motors, the motor is used in laser printers, industrial quality. Standard model FC130SA, weight about 20g, copper carbon brush (long wear life), exquisite workmanship, pressure sensitive, limit copper ring and many nylon gaskets, see the picture below for the specific size.
  
• 334-line AB phase encoder, including shaping circuit, the output is a very steep square wave, no overshoot, and can be directly connected to the IO of the microcontroller.
•  The encoder works normally at 1.8V-3.3V (when it is 5v, it is recommended to use a linear voltage regulator chip to step down or modify the current limiting resistor R1 of the transmitting tube on the encoding circuit, which is currently 82 ohms, and the red transmitting tube on the circuit mainly consumes Electricity, it is recommended to use a linear voltage regulator chip to step down the voltage. Directly changing the current limiting resistor requires strong hands-on ability, otherwise it will be easily damaged), square wave specification, and the measured power consumption at 3.3V is 21ma (mainly the power consumption of the emission tube, the voltage drop of the red LED is about 1.5v, 3.3-1.5/82=21ma), the encoder emits red light after power on, very beautiful, AB phase output, judge the level of the other party when the rising or falling edge of phase A or B, you can judge The direction of rotation of the motor.
•  Signal line description: A-phase square wave output, B-phase square wave output, VCC, GND are the encoder power supply, must be regulated, the voltage range is 1.8-3.3v, it is recommended to use a linear voltage regulator chip to step down or modify the encoding circuit for 5v The current limiting resistor R1 of the launch tube is 82 ohms at present, and the red launch tube consumes power mainly on the circuit. Motor +, motor - is the power supply of the DC motor, the voltage range is 3-24v, the rated value is 12v, and the no-load current is 30-40ma. The power supply of the DC motor and the power supply of the encoder are completely isolated physically. Only the power supply of the encoder is connected, and the motor can be turned by hand, and the AB phase square wave can also be output. Not only can the speed be judged, but also the direction of the moment of rotation can be judged. Using this principle, the motor Used as an encoder, the motor shaft is connected to other equipment and rotates accordingly. Motor +, motor - voltage range is very wide, and regardless of positive and negative, the polarity is reversed to control the motor reverse, 3-24V can work (the higher the voltage, the faster the speed, or use the PWM duty cycle to adjust the speed , Motor+, Motor- to connect to PWM drive). However, the encoder power supply has high requirements and requires voltage stabilization, and the positive and negative polarities must not be wrong!