any one known how to increasing Tx power of Arduino BLE 33 i saw code but its not compiling in my arduino IDE
What do you mean by "increase power"? I do not see any code so no comment on that..
according to the data sheet of Arduino ble 33 its 8 db but by default its 0 so i want increasing Tx power of Bluetooth
Where did you read the information that Tx-power can be increased up to 0 dB?
What do you think is the meaning of "low energy" =
The intention of bluetooth is to send data in a maximum range of 10m.
If you need to send over a bigger distance you should use a different technology
What distance do you need?
i am working on arduino BLE 33 for underwater application i want distance only 5ft
From a producer of underwater BT capable devices: Bluetooth and Water: How to Use Bluetooth Headphones While Swimming - H2O Audio
When any Bluetooth device is put underwater, the range is just few inches.
In general, water is extremely good at absorbing high frequency radio signals, more than half of the signal is lost within a half inch of travel. That would make it hard/impossible to achieve 5ft of range using bluetooth even if you would succeed in boosting the signal by much more than BLE is capable of.
any solution to increasing distance
An external antenna above water is the most logical. Most unlogical is tethering a longwire antenna to a flying fish.
Ray
how to connect external antenna to Arduino ble
There is no good answer at 2.4 GHz!
Not a true statement:
https://www.google.com/search?source=univ&tbm=isch&q=above+water+floating+2.4G+antenna
Now, I may agree that there is no known "cheap/easy" solution but members really should do some simple Google queries before just spitting out responses.
Ray
An external antenna is not going to increase the range unless it is above water which would make no sense if the device is supposed to move freely. You are basically trying to smack a 9" nail into concrete with a small screwdriver - sorry, but you will not succeed.
Is bluetooth a requirement or do you have other options?
I read this as "... increasing" the stated "few inches" under water.
But, maybe I was wrong... The discussion went from distance max in air to underwater before Op asked in post #8.
Added: one could also float the BT transmitter module/antenna on the surface with an waterproof cable to carry signal/power.
The point I was making is that at 2.4GHz, any reasonable feedline will cause more loss to the signal than the repositioned antenna can possibly gain. You cannot just use a length of coaxial cable!
as the next step you should give a pretty detailed description of the whole project.
As you have experienced now with this "I'm under water-detail" these short detail-questions where a new small snippet of information drops out after 5 postings is very in-efficient.
A distance of 5feet sounds like there is something stationary under water or at least moving around for a short distance.
It might have been an intriguing idea to use bluetooth but as you see now it turned out to not functioning. 2,4 GHz is that frequency that is best absorbed by water. (each and every microwave-oven uses 2,4 Ghz for that reason)
Submarines use super-low radio-frequencies for underwater-communication.
As you are underwater using water-resistant ultrasonic transducers might be an option.
But the best thing is if you really post a detailed description of the whole project.
Your scientific knowledge seem to be limited. Use the forum as a big extension about scientific knowledge in general.
best regards Stefan
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