Hello, I have problems with two module models - HC-05 and JDY-16. The idea is for the module to be the master, connect to an ELM327 device and establish a ware communication.
The problem with the HC-05 is that I can't set up in master mode. I send the commands, reset, but it's still in slave mode. I tried all 4 possible configurations on 27 and 28 pins from this link:
https://www.martyncurrey.com/hc-05-fc-114-and-hc-06-fc-114-first-look/, but ROLE it still says '0'. I send the commands in the setup mode with a button held on release. Command Description
https://cdn.instructables.com/ORIG/F8O/SMME/IU5NM2JJ/F8OSMMEIU5NM2JJ.pdf Then I got down to flashing. I decided to follow this guide because I have ft232 at hand:
https://www.instructables.com/Upgrade-Your-3-Bluetooth-Module-to-Have-HID-Firmwa/ . I set everything up, but BlueFlash doesn't recognize the chip. The connection is fine - I also checked the signals and there is some communication from the ft232 side which seems valid. Then I looked at the chip, as I said - it is smaller than the "classic" hc-05 module. Modules like mine are marketed as "new version". And the chip marking is CSR BC41C, but unfortunately nothing comes out as information. The closest is the CSR BC417 BlueCore 4 but according to the datasheet they are only in a BGA package and mine is a QFN.
The problem with the JDY-16 is that it does not forward data. It connects normally, the port settings are correct, but it does not send any data to the bluetooth slave (ELM327 in this case). I also tried with a different ELM327 but again the behavior is the same. Description of commands
https://esp32-server.de/wp-content/uploads/JDY16.pdfI have an older hc-05 module that connects to the ELM327 and communicates correctly, so the problems are isolated to the modules.
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