Quick one, embarrassing probably. I’m using an HC-05 as a serial bridge so a lab balance can send weights to a gateway that forwards them to Hermetry. I want to rename the module and set its baud to 9600.
Holding the button at power-up, LED blinks slowly every 2 s, so it’s in AT mode. I’m sending from an Uno sketch that passes the Serial Monitor through to the HC-05 at 38400. “AT” gives “OK”. Everything else:
AT+NAME=BAL-07
ERROR:(0)
AT+UART=9600,0,0
ERROR:(0)Maybe the baud rate is wrong? Try 9600 in the sketch.
Same thing happened to me with one from a starter kit, following.
The baud is right, otherwise plain AT wouldn’t answer OK either. ERROR:(0) is the HC-05’s code for a command it couldn’t parse, and with this module that almost always means the line ending. It wants every command to end with CR+LF. If the Serial Monitor is on “No line ending” or “Newline” only, the short “AT” sometimes gets through and the longer commands don’t.
Set the monitor to “Both NL & CR”. Also type the commands in capitals, and on some firmware versions AT+NAME only works while the KEY/EN pin is held high the whole time, not only at power-up. If NAME still fails, tie KEY to 3.3 V with a wire while you send it.
AT+UART=9600,0,0 then sets the data mode baud. AT mode stays at 38400 regardless.
Monitor was on “Newline”. Both NL & CR and NAME and UART went through at once. Kevin, the baud was fine, AT mode is always 38400 on these.
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