This project contains the source code of an nRF24L01+ and Blue Pill (STM32F103C8T6) based RF scanner. The Blue Pill scans frequencies from 2.400GHz to 2.525GHz (1MHz resolution) with nRF24L01+ and plots the activity on each frequency through UART.
This is what the UART output looks like (explained below):
|------------------------------------------------------------------------------------------------------|-----|-----|
|Frequency layout [GHz] |Ref. |Max. |
|2.4 2.41 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49..2.52 |RPD |RPD |
|| | | | | | | | | | | |[pcs]|[pcs]|
|------------------------------------------------------------------------------------------------------|-----|-----|
| :-. :: ::..%%@%@#%@@@%%%%#@@@ .-: :: | 10 | 180 |
|. .... .. . @@#%@@#%@@@%%%%#@@ :: . | 10 | 180 |
| .... ... .%@#%%%%%%%####%##% .. ..:. | 16 | 180 |
| .. ...:##***###%@%%@@@%#@ .::: | 11 | 180 |
| .... ...:... %%%%@%%%%%#***%#%% | 16 | 180 |
|:. . : .:. ..-###%%@###%##%##=: ...:. : | 11 | 180 |
|.. .. .:....: %%%%%%%%%%%@@%%# ::... | 12 | 180 |
|.... ... .. ..@%%@@%%%@%%%%%%% .. .. | 18 | 180 |
| . .::. @%#%%%#########* . | 11 | 180 |
|.. .. ::%%%%@%%%%@%%@@@% .:..: | 12 | 180 |
|..:::: .. . @#**#%***##*#%## .. .-:. | 10 | 180 |
| ... .. ... @%%%%@%%@%%##%%* .. ... . | 13 | 180 |
| .. . .. :*%*%%%%%@%%%%@@% ....... .. | 14 | 180 |
|.. .... .-:::--::------:: .+@@@* ....... | 57 | 180 |
|... .. ....::.:............ -#@@@#. . .. | 72 | 180 |
| .. . .. .. ................ :*@@@# ... .. | 73 | 180 |
| .. ....:............... -+@@@# .. | 73 | 180 |
| ...... ... .................. .##@@%# ..... .. | 74 | 180 |
| .... .......:............... #@@%%= .. .. | 75 | 180 |
|. ... . .... :::::::::::::::: *#@@%* | 38 | 180 |
|:.... .. ..@#**##**%**+**** ... ... | 14 | 180 |
|... . ... %**%%%%@%%##%#*# .. .. | 16 | 180 |
| . .. ....##*#%###*%%#%@## .....: | 14 | 180 |
Unknown sig. Unknown sig. Wi-Fi (WLAN 6) Microwave oven Unknown sig.
The axes:
f[GHz]
------------->
|
t |
[s] |
|
V
The time difference between each line is ~4s. The greyscale characters represent the signal strengths relative to each other. The signal classification has been added manually.
The code of this project has been implemented using
A detailed description can be found in docs/project_description.md.
A similar, Arduino libraries based design by cpixip can be found at forum.arduino.cc.
Important: the project has been developed and tested on Windows only.
Quick deployment process:
- Build the SW from command line with
makeandarm-none-eabi-gcc:
cd <path>\stm32-rf-scanner\src\Debug
make all
- Connect the configured pins (SWD, SPI and UART). Refer to docs/project_description.md#pin-description.
- Download the binary to the Blue Pill with STM32CubeProgrammer.
- Run the SW and plot the UART output using an USB-UART adapter and a serial port terminal.
Note: the SW can be built from Eclipse also. .project is stored in src.
Measurement results are stored in the meas folder.
This project contains files from multiple sources with different licenses. The relevant license is added to every source file.
The configuration files generated by Eclipse using the ARM Cortex-M C/C++ Project template are licensed (depending on the file) by:
- Arm Limited under Apache license 2.0 (Copyright (c) 2009-2018 Arm Limited. All rights reserved.)
- Liviu Ionescu under MIT license (Copyright (c) 2014 Liviu Ionescu)
The configuration files generated by STM32CubeMX are licensed by:
- ST under BSD 3-Clause license (Copyright (c) 2020 STMicroelectronics. All rights reserved.)
The files implementing the logic of the scanner functionality are licensed by:
- András Gémes under GNU GPLv3 license (Copyright (c) 2024 András Gémes. All rights reserved.)