arduino module hc-05

Hi,

your wiring is not clear to me.
I recommend to spend a little effort on drawing a sketch.

arduvin said:

Is there a pin on the hc05 slave bluetooth board

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If I needed to know this, then I need to read the datasheet.

arduvin said:

I made a post on the forum but nobody answers me

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can´t find another post...

Klaus

If I understand right, you want to transmit a 1-bit digital signal instead of UART data. HC-05 is a dedicated serial interface module using BT serial port profile, not intended for other uses. Serial port profile includes control signals, which could be used for the intended purpose, by I don't see control signals exposed at HC-05.

That's a pure software thing. HC-05 and similar HC-0x modules comprises CSR BC-517 bluetooth radio and a program flash. It could be shipped with a code supporting RS-232 control signals. But I didn't yet see something like this.

I see, that module pin 3 and 4 (next to pin 1 TX and pin 2 RX) are declared as CTS and RTS in a general hardware description. You may try if they have an undocumented function at HC-05. Also, how a static break signal is transmitted by the module pair.

There are discussions about HC-05 RTC and CTS signals, not very consistent. It sounds like they are either not working or acting as handshake between modem FIFO and external device. Thus not transmitted peer-to-peer.