Controlling Servo Motor (Setting Angle) using Arduino IDE

About This Tutorial

In this tutorial, we will control Servo Angle connected to evive and Arduino using Arduino IDE functions.

Tutorial Info

Programming Platform:

Arduino IDE

Difficulty:

Beginner

Estimated Time (hrs):

Robotic Arm

Servo Motor

Components Required

Component	Quantity	Available in Kit
evive	1	evive
USB A-B Cable	1	evive
Micro Servo Motor with Accessories	1	Starter Kit Robotic Arm Kit

Introduction

A servo motor is a rotary actuator that allows for precise control of angular position. It consists of a suitable motor coupled to a sensor for position feedback.

Controlling Servo Angle

Servo is controlled on the concept of PWM (Pulse Width Modulation). The refresh interval (the minimum time to refresh servos in microseconds) is 20000, which means that the servo is refreshing at a frequency of 50Hz. For most of the servos, a certain range of PWM correspond to the range of angle servo can rotate. Minimum pulse width is the shortest time for the pulse has been HIGH and maximum pulse width is the longest time for which the pulse is HIGH. Hence if the range of motor angular position is from 0 to 180, then minimum pulse width corresponds to 0 and maximum pulse width corresponds to 180.

Controlling Servo using evive and Arduino IDE

evive has two dedicated servo motor outputs pins.

Signal pin of servo 1 is connected to digital pin 44 and servo 2 is connected to digital pin 45.

Circuit Diagram

In the following example, I will be showing you how to control servo through channel 1. Given below is the circuit diagram:

A Servo pin has three wires (Order to be connected in evive, left to right)

Brown wire: GND
Red wire: VCC
Orange wire: Signal

Caution: Power evive using a 12V 2A power adapter for smooth functioning of servo motor. The VVR (Variable voltage) should be close to 6V.

Code for setting servo angle

There is a servo library which can be used to control the servo motor. The available functions are provided in the table below:

Function	Return data type	Comment
attach(int pin);	unit8_t	Attach the given pin to the next free channel, sets pinMode, returns channel number or 0 if failure
attach(int pin, int min, int max);	unit8_t	As above but also sets min and max values for writes
detach();	void
write(int value);	void	If value is < 200 its treated as an angle, otherwise as pulse width in microseconds
writeMicroseconds(int value);	void	Write pulse width in microseconds
read();	Integer	Returns current pulse width as an angle between 0 and 180 degrees
readMicroseconds();	Integer	Returns current pulse width in microseconds for this servo (was read_us() in first release)
attached();	bool	Return true if this servo is attached, otherwise false

In this example we will attach a servo motor and set the angle of the servo to 90 degrees.

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Controlling Servo using Arduino Uno

Arduino uno has 6 PWM pins: 3, 5, 6, 9, 10, and 11 which provide 8-bit PWM output with the analogWrite() function.

We will controlling serov using Pin 3.

Circuit Diagram

A Servo pin has three wires (Order to be connected in evive, left to right)

Brown wire: GND
Red wire: VCC
Orange wire: Signal

Caution: Power servos using a 6V 2A power adapter for smooth functioning of servo motor.

Code for setting servo angle

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