Water Spy - A Submarine Robot:
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1.INTRODUCTION:
Project entitled “Water Spy- A Submarine Robot” is a robot which works under water. Conventionally we see many robots which work on ground but we thought to accept challenge to make robot which could be operate beneath water. Major challenge encountered to is to balance the body of robot under water. Firstly we had to select motors which could operate beneath water. So critical circuit should be isolated from water. Some of the function which we had successfully implemented on robot that it can travel up, down, forward, backward, left, right beneath water.


1. DTMF ENCODER:
The code generator part employs a keyboard, IC UM 91215B and few other components. The IC UM 91215B is a ‘DUAL TONE MULTI FREQUENCY’ i.e. DTMF generator. Whenever a no. on the keyboard is pressed corresponding multiplexed frequency consisting of a lower band frequency and an upper band frequency is generated.

2. FM TRANSMITTER:
The DTMF code signals from UM 91215B is then frequency modulated and transmitted in air using FM transmitter. The carrier frequency is determined by coil L1 and trimmer capacitor C1 (they can be adjusted to change the frequency of the transmission). An antenna of 10 to 15cm length is used for satisfactory range. The antenna is necessary because the transmitter unit has to be housed in metallic cabinet to protect the frequency drift caused due to stray EM.


2.6 MAIN BODY:
Main body consists of water filled tank, air filled tank, stabilization tank & motor with fans attached to it. Air filled and water filled tanks are made up of PVC pipes. Stabilization tank is used for balancing of main body beneath water while the rotating fans provide motion to the body.

2.7 POWER SUPPLY:
• 9v Ni-Cd battery: This battery is used as a supply for transmitter circuit.
• 5v supply: 5v supply is used to provide power to the control circuit.
• 12v supply: 12v supply is used to provide power to the motor driver circuit.