The puprose of this git repo is to create a bluetooth buzzer that sounds when a button is pressed in a different room.
This will be done by connection two microcontrollers/raspberry pi with a bluetooth protocol, where when a button is pressed on one end
it sends a signal through the bluetooth and a buzzer turns on at the other end.
- Start with connecting a STM32F3DISCOVERY microcontroller to a Raspberry pi 0 W (I have both in hand)
- Transfer to STM32F401 black pill microncontrollers after they arrive
- Raspberry pi 0 w
- STM32F3DISCOVERY
- 2x STM32F401 black pill (likely overkill and will work with blue pill STM32F103)
- 2x HC-05 bluetooth boards (1x HC-05 and 1x HC-06 will work too)
- USB serial converter for programming HC-05: Available here
- Momentary switch/button
- Misc electronics; wires, soldering gun, resistors etc.
- Working openocd and gdb-multiarch for flashing STM devices
Initial setup
- Connect HC-05 TX to RX of USB to serial device
- Connect HC-05 RX to TX of USB to serial device
- Connect HC-05 5v/gnd to USB to serial device
- Hold HC-05 button down then connect the USB to a computer device
If done correctly, the bluetooth will slowing blink once every two seconds. It is in AT mode
Connect to minicom
sudo minicom -D /dev/ttyUSB0 -b 38400
Within minicom each command needs an enter, then ctrl-j
Replace new_name and 0000 with your choice
Slave setup:
Change buad rate to 115200 with 1 stop bit and no parity. Set AT+ROLE=0. 0: slave, 1: master
Also take note of the address. This will be needed for the master
The adress may be missing leading 0's. should be ####:##:######
AT
AT+VERSION
AT+ADDR
AT+UART=115200,1,0
AT+NAME=new_name
AT+PSWD="0000"
AT+ROLE=0
Master Setup:
Change buad rate to 115200 with 1 stop bit and no parity. Set AT+ROLE=1. 0: slave, 1: master
Replace <slave_address> witht the address found, but replace the colons with commas
AT
AT+VERSION
AT+UART=115200,1,0
AT+NAME=new_name
AT+PSWD="0000"
AT+ROLE=1
AT+CMODE=0
AT+BIND=<slave_address>