Have you ever tried to design a robot which can capture audio and video information from the surroundings and can be sent to the remote area? This article explains to you how to design a spy robot which can be controlled by the remote. The maximum controllable range is 125 meters. The remote has four switches to control the robot in four directions.

The robot senses the surroundings through the CCD camera and sends to the receiver through the Radio Frequency wireless communication. We have already studied how to establish RF communication in RF Remote Control Circuit for Home Appliances post. This circuit is also designed using such kind of technology.

Remote Operated Spy Robot Circuit Principle:

When we press any key in remote, the HT12E encoder generates 8-bit address and 4-bit data. Then ASK (Amplitude shift keying) transmitter sends 8-bit address and 4-bit data to the receiver. At the remote section DIP (dual inline package) switches are used to set 8-bit address. The receiver receives these 12-bit data and gives it to the HT12D decoder to decode the data. The decoded data is given to the L293D motor driver to rotate the robot motors.

Block Diagram of Remote Operated Spy Robot:

Remote Operated Spy Robot Circuit Block Diagram

Block Diagram Remote Operated Spy Robot Circuit

Circuit Components:

  • HT12E encoder
  • HT12D decoder
  • RF 433 MHz Transmitter and Receiver
  • L293D motor driver
  • Wireless CCD camera
  • push buttons – 4
  • DC battery – 12V, 1.3 Ah
  • 9V DC battery
  • Robot
  • Resistors – 33k,750k
  • SPST switch – 1
  • NOT gates – 4

Remote Operated Spy Robot Circuit Diagram and Design:

Remote operated spy robot has mainly two sections, one is remote control section used to control the robot and another one is video transmission section used to transmit audio and video information.

Remote Control Section:

Remote Operated Spy Robot Circuit - Remote Section

Remote Section of Spy Robot Circuit

Here HT12E encoder reads the parallel data from the switches and gives this data to the RF transmitter serially. The operating voltage of this encoder is 2.4 to 12V. The RF 434 MHz Transmitter output is up to 8mW at 433.92 MHz frequency. This ASK transmitter accepts both linear and digital inputs and the operating voltage is 1.2V to 12V DC. In a remote section, SW1 is used to enable the transmission.

Video Transmission Section:

In this section, major components are a wireless camera, RF receiver, and Robot.

Wireless CCD Camera:  The operating voltage of CCD camera is 12V DC. The supply for this camera is taken from the motors battery. The output signals of this camera are in the form of audio and video. These types of cameras are commonly available in the market.

Remote Operated Spy Robot Circuit - Video Transmission Section

Remote Operated Spy Robot Circuit – Video Transmission Section

RF Receiver:

ASK receiver receives the serial data transmitted by the transmitter and gives it decoder to convert it to the parallel. This parallel data is given to the L293D motor driver IC to control the robot motors. Here LED D5 indicates the valid transmission.

L293D Motor Driver:

L293d is a Dual H-bridge motor driver. Used as a current amplifier since it takes low current control signal and provides the higher current signal as an output. This output signal is used to drive the motors.

This IC drives 2 motors simultaneously, both in forwarding direction and reverse direction. Motor 1 direction can be controlled based on logic inputs at IN1 and IN2. Motor 2 operations are controlled based on the inputs at IN3 and IN4. Here the motors are operated with the voltage applied at pin 8.

  • IN1=0 and IN2=0 ->  Motor 1 idle
  • IN1=0 and IN2=1  -> Motor 1 Anti-clockwise direction
  • IN1=1 and IN2=0 -> Motor 1 Clockwise direction
  • IN1=1 and IN2=1 -> Motor 1 idle
  • IN3=0 and IN4=0 ->  Motor 2 idle
  • IN3=0 and IN4=1 -> Motor 2 Anti-clockwise direction
  • IN3=1 and IN4=0 -> Motor 2 Clockwise direction
  • IN3=1 and IN4=1 -> Motor 2 idle

Here Vcc is the voltage applied for the internal operation of IC. VSS is the voltage applied to drive the motors. We can apply a maximum of 36V and 600mA to drive the DC motors. Enable pins EN1 and EN2 of motor driver IC must be high to drive the motors.

How to Operate Remote Operated Spy Robot:

  1. Give the connections as per the circuit diagram.
  2. Arrange the wireless CCD camera to the robot.
  3. Give the wireless camera receiver connected to the computer or TV.
  4.  Now switch on both robot and remote supplies.
  5. Control the spy robot using the remote. Now you can observe the robot surroundings on your computer or TV.

Remote Operated Spy Robot Project Output Video:

Remote Operated Spy Robot Applications:

  1. This spy robot is used to observe the behavior of wild animals where human beings cannot reach.
  2. Used in army applications to detect the bombs.
  3. Used in industries.

Remote Operated Spy Robot Limitations:

  • This system does not work for longer distances.
  • This is a theoretical circuit and may require some changes to implement practically.


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