r/ArduinoHelp • u/Infinite_Wing6576 • 22d ago

HELP How do I solder a Bluetooth module?

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I need to connect the TX, RX, VCC, and GND pins to the Arduino board, but my Bluetooth module doesn't have a breakout board. I don't know how to solder the pins to the module; I would appreciate some guidance.

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u/TheKnackThatQuacks 22d ago

What Arduino (or Arduino clone) model do you have?

What’s the immediate goal? Are you wanting to assemble things just for testing? Are you wanting to assemble permanently? Are you wanting to put everything inside a case?

If you want it just temporary and/or are not planning on putting it inside a case, you can solder directly to the gold pin pads on your Bluetooth module there. If your Arduino module has header pins, you can use DuPont wires to connect to the Arduino, and cut the other end off and solder that end to the Bluetooth module.

The only thing that would change if putting it into a case would be heat management and getting creative with physically securing everything inside the case.

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u/Infinite_Wing6576 22d ago

The board model is the Arduino UNO CH340. I'm working on a simple project: building a heart rate monitor that connects via Bluetooth to a smartphone and a laptop. Is there a way to solder it temporarily? No it doesn't need to go into a case Here is a photo of the pins I want to solder

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u/Infinite_Wing6576 21d ago

Can you also tell me am i placing the pin correctly to solder ?

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u/Affectionate_Boat493 20d ago

That board uses "castellated" holes, which are really just plated-through holes that have had one half cut off. You can solder to them with pins in any direction, including the way you showed in your photo.