Hc-05 bluetooth module---obtain rail from uart or other

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1

Hello,
I have bought today, some buck converters instead of obtaining the p rail for the hc05 from the obd2 uart board which is feeding the hc. How can I neatly get the 3.3v from the Uart and is what I am doing better due to the loading of the uart ps? You can see what I am doing from my order for today. I am after a fast answer due to having placed my order.
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2

Hi Richard,

No we cannot see what you are doing. If you could provide us with the part numbers or names it would really help us out.

3

Hello,

I am using the hc-05 Bluetooth connected by jumper to sparkf OBD2-uart board. I am only missing the rail to the hc.

4

If I understand correctly I think you want a 3.3V step down converter, if you wire this to the 12V battery supply you should get the 3.3V you want.

5

The HC-05 module I used, had a 5V to 3.3V on board regulator.
If you have 5V available that is all you need.
I then used a SparkFun level shifter to connect 5V Arduino to the HC-05.

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