Introduction: Cheap Speedy Bee Bluetooth Module
Speedy Bee is an app for IOS/Android for checking/configuring Flight Control Boards .
Find out all about it here : SpeedyBee link
It provides easy acces to Flight controllers without the use of a computer or laptop , very handy when your out in the fields . It uses Bluetooth for the wireless communication , you can buy Speedybee hardware or use an "El Cheapo" as I did . But it needs a bit of tampering :-)
Here's the stuff we need to talk to our flight controller :
Cable , USB to serial : Cable-link
Bluetooth module from Banggood :AT-09 module
Computer or laptop , terminal software ( eg Arduino IDE , Putty , picocom ...)installed
I assume basic knowledge of R/C drones and flight controllers ( Betaflight configurator and firmware) . SpeedyBee also works with iNav and ButterFlight , check out their site .
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Step 1: Setting Up the Bluetooth Module
The AT-09 module from Banggood works perfect for SpeedyBee but we need to change some settings .I found a lot of datasheets and docs but while testing the module I had several errors ...
So I tried and tried until ... it worked so let's share it !
Fire up your computer and start the terminal software ( I used Arduino IDE ).Start the serial monitor . Connect the serial-to-USB cable to the module as follows :
--Red female from cable to module VCC
--Black female from cable to module GND
--White female from cable to module TXD
--Green female from cable to module RXD
STATE and EN on module are not connected.
Check and doublecheck your connections and plug the USB-side of the cable into your computer .
Step 2: Configuring the Module
Verify if your terminal baudrate is 9600 baud and NL/CR ( newline carriage return) are selected as seen on the pictures ( sorry it's in Dutch ...) .
Type "AT" and Enter , module should respond "OK". Now type "AT+HELP" and Enter , module will show a listing as seen on the pics .
Type "AT+NAME" followed by a name you choose , module will reply "NAME= ....".
Now it's time to put the module's serial output at 19200 baud as needed by SpeedyBee app .
Type "AT+BAUD5" and Enter . Module answers "+BAUD=5" and OK .
Change the baudrate of the serial monitor to 19200 (or you'll see garbage or nothing at all :-) )
Type "AT" and Enter , if the module says "OK" you're done !
Step 3: Setting Up the Flight Control Board
To test the Bluetooth module with SpeedyBee I needed a Flight Control Board . I had an F3 evo Brushed on my shelf that needs repair , the boost converter was dead but it worked fine when connected to USB . It's a very silly setup as the Bluetooth module has the same size and weigt as the F3 evo but it's OK for testing :-).
The Flight Controller must have BetaFlight version 3.1.0 or above , if needed update your Flight controller .
We'll need our computer or laptop one more time before we can use the SpeedyBee app : we need to configure a free UART port at 19200 baud for communication with the Bluetooth module .
This is very well explained in the SB-BUA manual . Startup the Betaflight Configurator , connect your board and go to the Ports Tab . Select a UART ( I picked 2 ) and set the Baudrate to 19200 .
Save and reboot and you're done !
Step 4: Hooking Up and Testing
Find the PCB layout of your board and find the choosen UART . Connect the module to your Flight controller ( soldering , wire wrapping to the module) . Refer to the SB-BUA manual . Verify your job , very important !
Launch the app and power the flight contoller . The app will aks you " Tap to start scanning".
I named my module "BLOETOET" .
When you do this the name you've chosen in the previous steps should appear , when it connects you're in ! Configure/Test but most of all : Have Big Fun !
If not successfull refer to the SB-BUA manual it provides a good troubleshooting procedure !
Good Luck and Happy Flying !