lobotomized HC-05?

[pmc]

Hi all,

I have an HC-05 that used to work and still works fine in "communications mode". In "command mode" it still responds to "AT" with "OK", but now it answers "ERROR: (0)" to any other AT+ command. Including AT+ORGL. Has anyone else seen this?  Any ideas how to more authoritatively reset it?

HC-05
ZS-040
hc01.comV2.1

This started after I AT+RESET it after setting a new UART bit rate, for whatever that's worth.

[pmc]

For whoever might find this later:

Using a different serial connection fixed it.
There was apparently no problem with the unit.

Failed for AT/command mode: USB<->Arduino UnoR3 clone<->soft serial<->HC-05
Worked: USB serial adapter (PL2303)<->HC-05
both 38400bps

[Ian.M]

If you have to do that again and don't have a USB <=> logic level serial adapter handy, you can jumper the Arduino Reset to Gnd to disable all the ATmega I/O pins including RXD and TXD then use the Arduino's on-board USB serial adapter to communicate with youre device.   D0 (RX) is data from USB, D1 (TX) is data to USB.  Both have 1K series resistors, so if you need 3.3V levels, put a 1K8 pulldown on D0.

[pmc]

Yes. And starting there would make more sense than ending up there!