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1. Department of
Electronics & Communication Engineering
Implementation dc motor as
servomotor by using arduino
and optical rotary encoder
Clifton Jeremy Martis
4NM19EC043

2. 02
Department of ECE
• Introduction
• Uses of servo motor
• Components
• Conclusion

3. Introduction
• When we control a motor by means of
servomechanism, it would be referred as
servomotor.
• Servomotor was first developed by Yaskawa in
1960s.
• A servo motor provides accurate and also fast
response.
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4. Introduction
• With servomotors we can get high torque in a
small and light weight packages.
• There are two types of servomotors. They are
AC servomotors and DC servomotors.
•
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Fig. 1 DC servomotor
Fig. 2 AC servomotor

5. Uses of servomotor
Some of the uses are
• Cameras
• Telescopes
• Antennas
• Elevator technology
• Robotics and conveyor belts for industries
• Toy cars, aeroplanes
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Fig. 3 industrial robots
Fig. 4 conveyor belts
fig. 5 antenna

7. Components
• DC motor
• Optical rotary encoder
• Motor driver
• Arduino microcontroller
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Department of ECE
• DC motor is a device which converts direct
current electrical energy into mechanical
energy.
• They are simple to install and easy to maintain
Fig. 6 DC motor

9. Optical Rotary Encoder
• An optical rotary encoder is a device which
detects optical signals that have passed
through the slits, converts them into electrical
signals.
• It has a light source (LED), light sensor and a
disk called optical disk with slits.
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Fig. 7 optical rotary encoder

10. Optical Rotary Encoder
• The light source is typically an LED. Instead of
using a visible light, an infrared light is usually
transmitted.
• The light sensor is a photodiode which is
sensitive to infrared light.
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11. Optical Rotary Encoder
• A disk used is placed between the light source
and the light sensor. It is connected to the
shaft of the motor.
• As the disk is rotated, light passes through a
translucent slots and is blocked by the opaque
areas between the slots.
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12. Fig. 8 Optical Rotary Encoder diagram
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13. Motor driver and Arduino
• A motor driver acts as an interface between a
motor and control circuit.
• The Arduino microcontroller doesn’t provide
high output power
• The motor driver helps in providing sufficient
power to the motor.
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Fig. 9 motor driver
Fig. 10 Arduino uno

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Department of ECE
• It was required to built a servo motor with
wide rotation angle and high torque.
• We have used a DC motor with gearbox,
motordriver and an optical encoder.

16. • While the cost of a servo motor increases as
the rotation range gets wider.
• Therefore a servomotor using an optical rotary
encoder will reduce the cost.
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Department of ECE
[1] Ali Abdyaseer Kadhum , Munther Mohammed Abdulhussein,
Implementation dc motor as servomotor by using arduino and optical
rotary encoder, Elsevier, pp. 01- 05, 2021.
[2] Moyeed Abrar, interfacing a servo motor with Arduino uno
microcontroller, International Journal of Recent Scientific Research Vol.
10, Issue, 02(E), pp. 31010-31014, February, 201

18. 20
Department of ECE
Clifton Jeremy Martis
4NM19EC043