Home project. Uno A in the shed reads soil moisture for the greenhouse beds and a door contact. Uno B in the house has a SIM800L GSM module (no broadband at the house yet, long story). B should forward A’s readings to Hermetry together with its own. The shed is about 15 m away so I’m trying two HC-05s, A as slave and B as master.
Configured in AT mode:
slave (A): AT+ROLE=0 -> OK
AT+ADDR? -> +ADDR:98d3:31:fb1234
master (B): AT+ROLE=1 -> OK
AT+CMODE=0 -> OK
AT+BIND=98d3:31:fb1234 -> ERROR:(1D)The BIND fails, and when I tried CMODE=1 instead the master LED keeps blinking fast forever and never connects. What am I doing wrong?
Fast blink means not connected. Once they link you get two quick blinks every couple of seconds.
I did exactly this for a uni lab last term and got the same ERROR on BIND. The address comes out of AT+ADDR? with colons, but AT+BIND wants commas, in the order NAP,UAP,LAP:
AT+BIND=98d3,31,fb1234Full sequence that worked for us, both modules entered with KEY/EN held high at power-up (AT mode is 38400 baud):
slave A: AT+ORGL
AT+ROLE=0
AT+PSWD="4321"
AT+UART=9600,0,0
master B: AT+ORGL
AT+ROLE=1
AT+CMODE=0
AT+PSWD="4321"
AT+BIND=98d3,31,fb1234
AT+UART=9600,0,0Same PSWD on both, then power-cycle both without KEY held. Master pairs within a few seconds. After that it’s a plain 9600 serial line between the Unos.
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