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Things That You Should Know About Under Water Treasure Hunting

Water bodies make approximately 70% of the Earth's surface and hence hold great promise for treasure hunters. Under water treasure hunting is a comparatively recent phenomenon that leaves with a whole lot of options and possibilities.

From ship wrecks to inundated palaces and historic castles, under water treasure scene is truly mind boggling. However to hunt for treasures underneath the water, you should have sophisticated metal detectors and pinpointers that help you locate the treasure and water roof pouches and carry bags to carry back the collected bounty.

In addition, you will be using lift bags and ropes to bring back vestiges from under the water. Once the hidden treasure, is located the treasure hunter dives down to find it. For this you may require specific underwater metal detectors. Typically very low frequency pulse induction detectors and broad band spectrum detectors are used for under water metal detecting.

Pulse induction detectors emit electronic pulses, which are only sensitive to the metals underneath the water and no to the sand and minerals in the water. It is best suited for salt water beaches as it can be used to great depths. Normally functioning within 3 - 30 kHz range of frequency, this type of detector is sensitive to coins and jewelry among others and the best part is that it can separate precious items from trash.

Very low frequency detector could be influenced by the minerals, which in turn could affect the quality of your find. However you can adjust it to minimize the disturbances caused by signals produced by the underwater minerals.

Broad band spectrum underwater detectors on the other hand emit signals in various frequencies from 1.5 - 25 kHz. Underwater metal detectors can be used along the beach or under water and are commonly used to locate shipwrecks and for massive archeological missions as well. You can locate precious, antique relics with these gadgets that are built for heavy duty operations.

Underwater metal search is not for everyone as it is a physically exhausting task. Extreme cold and current conditions and poor visibility makes these operations risky and arduous. However the invention of scuba diving has helped a lot in unveiling the intriguing underwater world to the divers.

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Online shopping is the best possible bet to scout for underwater metal detectors and accessories like pouch and carry bags at easy rates. You can also share tips and information on underwater treasure hunting in online forums.

Here Are Seven Easy Steps For Using A Metal Detector Underwater In Florida

To operate an underwater metal detector in Florida, select the right detector, be sure that your treasure-hunting necessities are in order, adjust the detector’s volume to an appropriate setting, match the frequency of your target, determine the depth rating, unhurriedly explore inch by inch, and clean the metal detector when you are finished.

Florida makes the perfect holiday destination with its beaches, rivers and lakes. Moreover, this is a hobby that excites adventurers and treasure hunters alike. Florida can be an exciting place to search for rare coins, antique jewelry, and buried treasure if you outfit yourself with the proper gear, such as underwater metal detectors and waterproof headphones. Here are a few easy tips that will ensure you success in your next underwater metal detecting adventure!

Choose the right metal detector

Not every metal detector is suitable for each environment. You need to choose the one that is right for you. Pulse detectors are ideal for the saltwater beaches of Florida and are notable for being resistant to the effects of wet, salty sand and other ground minerals. However, low-frequency motion detectors can sift through debris more easily to find valuables and other metals. Nevertheless, you should take note that minerals which are common on Florida beaches can easily destroy low-frequency motion detectors.

Get the necessary treasure-hunting gear ready

Some items that you should have for your treasure-hunting expedition are waterproof headphones, which will facilitate your search for deep targets and reduce external noise, a sand sifter, and a trowel for digging underwater. You will also need clean water and a roomy carry-on bag that can accommodate and protect your metal detector.

Determine the depth rating

Always pay attention to the depth rating of your metal detector when you are planning to snorkel or go diving.

Set the volume of your underwater detector to a comfortable level

It’s important to ensure your underwater detector’s volume level stays appropriate for Florida’s environment setting. Generally, volume levels for underwater detectors have a default setting to prevent any discomfort and ear damage, but the loud surf setting in the Sunshine State might require you to reset the volume and match it according to Florida’s distinct surf atmosphere.

Match your target frequency

Before you set the frequency level on your metal detector, test it first on the same type of target that you want to locate. You could miss the signal of thin objects like coins and rings if you choose the wrong frequency.

Look slowly and continuously

You need to make a slow and meticulous search to achieve optimal results from underwater pulse detector scans. You must be certain to transfer the search-head of the detector from one side to another above the sand filled bottom of the sea.

Clean your metal detector after use

Always remember to clean your metal detector after each usage. Use only clean water to flush away any sand and silt from the metal detector’s exterior to avoid damage to your equipment. To avoid corrosion, you should make sure that no saltwater has seeped into the control box. If it happens to you, just remove the cover to let it dry.

Having the right tools and equipment will allow you to find many exciting things in Florida.

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Is it possible to do a project 'water level detector with buzzing alarm' using only microcontroller?if so how?

Yes...

Again you have to choose how you are going to detect water. Two methods are using resistance or capacitance changes across the water detection probes.

You can use a hardware comparator built into a micro to detect a voltage change across two metal probes. One probe attached to ground the other is attached to the input of the comparator and a pull up resistor. When water touches the probes a circuit is completed to ground lowering the voltage input to the comparator. (You can also use an ADC to measure the voltage)

Another method would measure capacitance changes of the probe. There are several ways to measure capacitance and these basically share common techniques of placing a known amount of charge onto the cap and then measuring the voltage. The higher the voltage build up the smaller the capacitance.

This technique is useful in detecting low conductivity fluids. It detects a change in dielectric constant vs conductivity. You can also make a water probe on a PCB by use adjacent parallel traces.

An advantage to measuring capacitance is that this sensor is analog and will allow you to measure different water levels with a single probe assembly. THe Comparitor technique above is digital, meaning it only detects the presence of water, to determine different levels you would need additional sensors at different levels.

You can always use simple float switches as inputs to the uC. THis is the simplest of all methods but does require additional hardware in the form of float switches.

The capabilities of the microcontroller you choose will help determine which of the above methods you choose.

The buzzer part is easiest of all, merely generate a squarewave signal at an audio frequency and apply it to a speaker. This can be done using a timer that controls the state of an output pin on the uC. You can also add a transistor as an amplifier if needed.

Offshore, a robot sub is put through its paces (OC Register - Sciencedude)

A retooled robot submarine that can map the depths for oil drilling, scan for
radiation or even track whales and other sea life is being tested this week
off Santa Catalina Island. Boeing hopes its "Echo Ranger," first built in 2001
for the oil and gas industry but now equipped with an acousting sensor and
[...]

Offshore, a robot sub is put through its paces is a post from: OC Science

OC Register - Sciencedude

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