BT module hc-05

[maksymilian_zodiac]

Recently, I've been trying to configure and read configuration data from HC-05 modules. I had one module with a baseplate and a button for turning on AT mode, and with it, I could use the Arduino board to send config commands (the module responded, and everything was fine).

The other module doesn't have a button for turning on AT mode, so I've soldered an extra cable to the KEY pin and plugged it into the VCC to set it to a high state, but it didn't work. I can't turn on AT mode, and the same issue occurs with the module without the baseplate.

Do you have any ideas why it didn't work or what I might be doing wrong?

[Nick_Pyner]

@maksymilian_zodiac

it into the VCC

3.3v not 5v.
Soldering the wire seems a bit extreme, did you really need to do that?

[maksymilian_zodiac]

Well how else would i give this exact pin a high state?

[Nick_Pyner]

Most people make do with a jumper wire, or just a touch connection onto the pin.

[Wawa]

So did you connect that pin to 3.3volt or 5volt (post#2).
The HC-05 uses 3.3volt-logic. connecting that pin to 5volt might have fried it.
Leo..