Project #8: Servo – Potentiometer Servo – Mk01

Servo Motor

A servo motor is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servo motors.

Servo motors have been around for a long time and are utilized in many applications. They are small in size but pack a big punch and are very energy-efficient. These features allow them to be used to operate remote-controlled or radio-controlled toy cars, robots and airplanes. Servo motors are also used in industrial applications, robotics, in-line manufacturing, pharmaceutics and food services.

Circuit

Servo motors have three wires: power, ground, and signal. The power wire is red, and should be connected to the 5V pin on the Arduino board. The ground wire is black and should be connected to a ground pin on the board. The signal pin is orange and should be connected to pin 9 on the board.

The potentiometer should be wired so that its two outer pins are connected to power (+5V) and ground, and its middle pin is connected to analog input 0 on the board.

DonLuc1805Mk07

1 x RGB LCD Shield 16×2 Character Display
1 x Arduino UNO – R3
1 x ProtoScrewShield
1 x Servo Motor
1 x 100k Ohm Potentiometer
1 x Potentiometer Knob
4 x Jumper Wires 3″ M/M
4 x Jumper Wires 6″ M/M
1 x Half-Size Breadboard

Arduino UNO

Ser – Digital 9
Pot – Analog A0
VIN – +5V
GND – GND

DonLuc1807Mk03.ino

// ***** Don Luc *****
// Software Version Information
// Project #8: Servo Motor - Potentiometer - Mk01
// 7-3
// DonLuc1807Mk03 7-3
// Servo Motor
// Potentiometer Servo

// include the library code:
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>
#include <Servo.h>

Adafruit_RGBLCDShield RGBLCDShield = Adafruit_RGBLCDShield();
#define GREEN 0x2

// Potentiometer Servo Motor
Servo isServo;                            // Create servo object to control a servo
int iPot1 = A0;                           // Analog Potentiometer 1
int iVal;                                 // Variable - Analog Potentiometer 1

void loop() {

  // Potentiometer Servo Motor
  iVal = analogRead(iPot1);               // Reads the value of the iPot1 (Value between 0 and 1023)
  iVal = map(iVal, 0, 1023, 0, 180);      // Scale it to use it with the isServo (Value between 0 and 180)
  isServo.write(iVal);                    // isServo sets the servo position according to the scaled value
  delay(15);    

  // Display
  // Set the cursor to column 0, line 0  
  RGBLCDShield.setCursor(0,0);
  RGBLCDShield.print("Potentiometer");     // Potentiometer
  // Set the cursor to column 0, line 1
  RGBLCDShield.setCursor(0, 1);
  RGBLCDShield.print(iVal);                // Reads the value iVal
  
  delay(500);
  
  // Clear
  RGBLCDShield.clear();
  
}

setup.ino

// Setup
void setup() {

  // set up the LCD's number of columns and rows: 
  RGBLCDShield.begin(16, 2);
  RGBLCDShield.setBacklight(GREEN);
  
  // Display
  // Set the cursor to column 0, line 0  
  RGBLCDShield.setCursor(0,0);  
  RGBLCDShield.print("Don Luc");         // Don luc
  // Set the cursor to column 0, line 1
  RGBLCDShield.setCursor(0, 1);
  RGBLCDShield.print("Potentiometer");   // Potentiometer Servo Motor

  delay(5000);

  // Clear
  RGBLCDShield.clear();

  // Potentiometer Servo Motor
  isServo.attach(9);                     // Attaches the Servo on pin 9 to the Servo Object

}

Don Luc