ghawas-

GHAWAS is an address underwater communication between various entities; divers or boats. Since RF waves are not operational underwater due to the presence of salt which act as conductors causing a short circuit with the antenna, we will use visible light as the means of communication instead. GHAWAS allows multi-entity communication. It enables communication between divers and their boats. It could be used for military causes especially for spying. GHAWAS consists of using diver masks, waterproof microphones, bone conducting speakers, photo-detectors, waterproof cables and LED light sources. The diver wearing the mask will send a message using a waterproof microphone. Next, the micro-controller will change the audio signals into a series of visible light signals which are going to be transmitted to the LED source. The other diver will detect the light signals sent by the opposite LED source using a photo-detector. These signals are going to be converted to audio signal using another micro-controller. Finally, the other diver will be able to hear the message using bone conducting speaker.

GHAWAS will be very beneficial to for divers especially in sea exploration. The divers will not need extra gadgets since they usually have lights which they normally use for vision. Thus, the lights will be used for multiple purposes; vision and communication. Moreover, the idea will be of very high importance for military purposes since light is highly secure and interference is very low.

We will concentrate in our project in sending data using visible light underwater where anew idea is shown to let divers to talk each other using visible light of the led they are already use underwater, so they will use and benefit from it. This is done using diver masks, waterproof microphones, bone conducting speakers, photo-detectors, waterproof cables and LED light sources. The diver wearing the mask will send a message using a waterproof microphone. The other diver will detect the light signals sent by the opposite LED source using a photo-detector. These signals are going to be converted to audio signal using another micro-controller. Finally, the other diver will be able to hear the message using bone conducting speaker. Our product is based on an already existent scientific basis but what makes it different from other existent competitive solutions is that it gets the more better way using visible light communication technologies under water, with the simplest components that used to reach this specific usage but at the other hand it also used for many applications. I want to I develop my product so that I can establish my own company.

In order for one to hear sound it must travel through air (gas particles) of which space has very few per cubic centimeter. Sound can only travel through a solid, liquid or gas. Space being an almost perfect vacuum does not allow sound to travel and be heard by the ears. Sound is vibrations of air particles, so any “sound” that is heard in space has to come from other means such as from the electromagnetic spectrum and these waves are not sound.

How do Astronauts communicate As such, astronauts communicate with each other in space when they are spacewalking through the use of radio waves. Radio wave signal are sent to their headsets which then translates the signal into the form of sound . When receiving and sending message to earth it is sent in the form of radio waves which is then translated to sound wave (message) by a radio set. Radio wave is a part of the light spectrum called electromagnetic spectrum (see diagram below ) and is therefore a light wave. Light does not need a medium to travel and this, further explains why the Sun’s light travels through space to earth. Light waves are not sound waves.

Astronauts can however, talk to each other as if they were on Earth only when they are in their space ship. Here, there are enough air particles to vibrate and take the sound to their ear drum.

                                                                                     GHAWAS's message
                                                             "GHAWAS … imagine Astronaut communicate using light ".

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