Bluetooth

[edouard]

Posted on July 28, 2015 at 11:00

Hello, 

I want to interface a STM32F0 discovery with a Bluetooth module (HC-06). I wanted to know if I can take 2 pins of the STM32F0, one in output and one in input (for TX and RX) ? And are they 3.3V level or 5V level ?Thanks for your help

[Tesla DeLorean]

Posted on July 28, 2015 at 15:47

The DISCO pins for RX/TX will be at 3V CMOS levels, which is fine. You'd power the HC-05/HC-06 off the 5V USB supply on the DISCO.

[edouard]

Posted on July 28, 2015 at 20:52

Thanks for your help. The disco pins can only be 3V, not 3.3 ? But yeah 3V should be fine for the 3.3V lvl Tx pin from the HC-06.

I will power off the disco with the usb cable but for the HC-06, I was thinking of taking one pin from the disco at 5V and one other at GND, since the disco will be supply with 5V through the usb, a VCC pin will be 5V. Is that correct ?

[Tesla DeLorean]

Posted on July 28, 2015 at 21:12

All the DISCO boards I'm familiar with run at 3V, not 3.3V

I have a

http://mcuoneclipse.com/2013/06/19/using-the-hc-06-bluetooth-module/

board hung off an STM32L152-DISCO board right now. It expects a 3.6 - 6V supply, which is taken off the 5V pin on the DISCO board header pins, which itself is powered via the ST-LINK's USB cable. I have BlueTooth (USB BT Dongle) serial connectivity to a PC with a RealTerm console, and the STM32 is outputting telemetry data via the HC-05

[edouard]

Posted on July 29, 2015 at 09:43

Thanks a lot !