Namaste Robot with Voice Control Working and Applications

A robot is an electro-mechanical machine that is directed by a circuitry or a computer program.Robots have exchanged humans in the aid of performing continuous and dangerous tasks which humans choose not to do. Present robots are classified into different categories based on their features and performance like industrial robots, commercial robots, service robots, mobile robots. Here is a service robot which performs the continuous tasks to welcome the people by a hand movement representing “Namaste” through a recorded voice message. Generally, when we invite people to home, parties, marriage functions, office, etc. We need to arrange a person to greet and invite them at the entrance. If the amount of the people is low, then the task is simpler. But if you greet hundreds of people, then the task is difficult. To overcome this problem, here is a project, namely namaste robot with voice control.

Namaste Robot
Namaste Robot

Namaste Robot with Voice Control

The main concept of this Namaste robot project is to control the various servo motors through an Arduino board. This robot scans the surrounding people and rotates its head around by 180°. If it recognizes anyone nearby, then it wishes that person with Namaste with both the hands pressing together. It is the traditional way of wishing people in India. The applications of robots involve in shopping malls, parks, offices to attract the people.

Block Diagram of Namastae Robot with Voice Control

The following figure signifies the block diagram of the Namaste robot with voice controlled. In this kind of robot, voice commands are programmed. The entire development board can be connected to the common power supply. The description of each and every block is as follows. The power supply gives the power supply to all the modules. These modules require current in mA and operating voltage will be 5V.

Block Diagram of Namastae Robot with Voice Control
Block Diagram of Namastae Robot with Voice Control

Arduino Board

Arduino is a one kind of tool based on a simple microcontroller board used to control and sense the physical world than a desktop computer. For physical computing there are various microcontroller platforms are available. The important features of an Arduino are inexpensive, open source & extensible software.The Arduino software  is available as open source tool and the language can be extended through C++ libraries.

Arduino Board
Arduino Board

Ping Sensor

The ping sensor uses SONAR to control the distance of an object in its vicinity. This sensor is used as the eyes of the robot to sense the obstacle.For instance, proximity sensor. It gives an excellent range accuracy and stable readings. The operation of this sensor is not affected by black material or sunlight. The specifications of the ping sensor are voltage is 5V, current is 15mA, sensor angle is NOT>=15 and detection distance is 2 cm~450 cm.

Ping Sensor
Ping Sensor

The interfacing of ping sensor with an Arduino is shown below. There are four pins are available to interface he ping sensor with an Arduino board. The four pins on the Arduino board are GND, VCC, ECHO and TRIGGER. The pins on the board are D0-D13, in that 12 and 13 pins are input and output pins.

Arduino microcontroller offers us with a servo control library that lets us switch servos with ease. In this project we used 5 servos to regulate the movements of the Namaste robot like head, right elbow, left elbow, right shoulder and left shoulder. Here, the digital input/output pins (D5, D6, D9, D10, D1) pins signify in the Arduino board interfaced to servo motors.

Voice Playback IC

This voice playback IC offers the recorded message that plays at the predefined frequency rate. The playback is moved to the audio amplification unit.

Voice Playback IC
Voice Playback IC

Relay

A relay is a one kind of switch operates electrically. The flow of current through the coil of the relay makes a magnetic field which invites a lever & changes the switch contacts.

Relay
Relay

Voice Control Namastae Robot Working

The working of the Namaste robot can be done in a step by step procedure along with the simulated results. When the Namaste robot is in a first state, then the servo motors of the robot 2, 3, 4, 5 are in OFF state or zero state. The head of the Namaste robot alternates from center to right, left and then to back to center due to spin of Servo motor1 from 0°-180°. The movement of the robot’s head specifies that the Namaste robot is looking for an obstacle. When the ping sensor detects any obstacle, the head position of the robot returns to the center and Servo motor1 relics at 90° angle and switched OFF. It is activated in a LOW state.

When the servo motor1 gets switched OFF then the remaining motors like servo4 and servo5 switches ON. The signal line is triggered for the right and left shoulders of the Namaste robot. Now the hands of a robot can make movement up. The shoulder servo motors are interfaced to the digital input and output pins of the Arduino board. But, signal lines or these pins will be high and the position of the servo is changed to 90°. Now the servo4 and servo 5 turns OFF.

Finally we can conclude that, the main aim of this voice control robot is to provide the service of welcoming people politely by detecting people walking in front of it. It can be used in various public places like parks, shopping malls, parties, etc. We hope that you have got a better understanding of this concept. Furthermore, any queries regarding this concept or arduino based robot projects, please give your valuable suggestions by commenting in the comment section below.

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