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216 lines
7.2 KiB
Markdown
216 lines
7.2 KiB
Markdown
# Lora SA(Spectrum Analyzer)
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## RF Spectrum Analyzer using Lora Radio
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<img src="https://github.com/user-attachments/assets/4caeb467-1964-4184-ab20-ba68b97144aa" alt="LORA hardware" width="200"/>
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Based on RadioLib SX126x Spectrum Scan.
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Perform a spectrum power scan using SX126x.
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The output is in the form of scan lines; each line has 33 power bins.
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The first power bin corresponds to -11 dBm, the second to -15 dBm, and so on.
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The higher number of samples in a bin corresponds to more power received
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at that level.
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```text
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N in Bin / dBm
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(0)1 -11
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2 -15
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3 -19
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4 -23
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5 -27
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6 -31
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7 -35
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8 -39
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9 -43
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10 -47
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11 -51
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12 -55
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13 -59
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14 -63
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15 -67
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16 -71
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17 -75
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18 -79
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19 -83
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20 -87
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21 -91
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22 -95
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23 -99
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24 -103
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25 -107
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26 -111
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27 -115
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28 -119
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29 -123
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30 -127
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31 -131
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32 -135
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33 -139
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```
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Example:
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```text
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step-13 Frequency:816.25
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Power Bins: 0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0000,0400, 0000,0000,0000,0000,0000,0000,0006,001B,000E,0005,0006,0002,0000
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```
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The spectrum analyzer performs power measurements in the configured bandwidth.
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The X-axis represents frequency in MHz, and the Y-axis displays actually received power.
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In the example above, the frequency span goes from 850 MHz to 950 MHz (that is a 100MHz range), and
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the visual amplitude goes from -11 dBm to -110(-139) according to the datasheet (High sensitivity: down to -148dBm) dBm.
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To show the results in a plot, run the Python script
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RadioLib/extras/SX126x_Spectrum_Scan/SpectrumScan.py
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## Features
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### Multiple Ranges Scan
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Disabled By Default
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```c
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// Feature to scan diapazones. Other frequency settings will be ignored.
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int SCAN_DIAPAZONES[] = {};
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//int SCAN_DIAPAZONES[] = {850890, 920950};
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```
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To Enable Add/ uncomment an array of the frequencies
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```c
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int SCAN_DIAPAZONES[] = {850890, 920950};
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```
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where 850890 stands for 950-890Mhz range
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920950 - 920-890Mhz
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Other settings will be ignored if **Multiple Ranges Scan** is enabled.
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### Waterfall
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Waterfall showed only on One Page Scan
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to disable - uncomment this line
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```c
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#define WATERFALL_ENABLED true
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```
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Waterfall shows the last **N** = SCREEN_HEIGHT (64) - WATERFALL_START(37) - 8 (part of the ROW_STATUS_TEXT) = **19** signal detection that excited set signal level
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### RSSI Method of scan
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By default, we are using the spectralScan method of the RadioLib Library: <https://jgromes.github.io/RadioLib/class_s_x126x.html#a8a3ad4e12df862ab18b326d9dba26d66>
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This method works only with Sx1262 modules.
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We implemented a scan using the **getRSSI** method, which has more flexibility and supports sx1276 and other modules.
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Using this method, we also receive the signal's **dB** values, not just the O-33 number.
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To enable this method, set the value of the **RSSI_METHOD** to true.
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### Multi Screen Scan
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Single screen scan for now has **RANGE / 128** resolution.
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Multi-page scan can be adjusted to how many MHz per page you wanna scan
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```c
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// frequency range in MHz to scan
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#define FREQ_BEGIN 850
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// TODO: if % RANGE_PER_PAGE != 0
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#define FREQ_END 950
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// Feature to scan diapazones. Other frequency settings will be ignored.
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int SCAN_DIAPAZONES[] = {};
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// int SCAN_DIAPAZONES[] = {850890, 920950};
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// MHZ per page
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//To put everything into one page set RANGE_PER_PAGE = FREQ_END - 800
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unsigned int RANGE_PER_PAGE = FREQ_END - FREQ_BEGIN; // FREQ_END - FREQ_BEGIN
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//To Enable Multi Screen scan
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// unsigned int RANGE_PER_PAGE = 50;
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// Default Range on Menu Button Switch
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#define DEFAULT_RANGE_PER_PAGE = 50;
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```
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To enable Multi-page by default set **RANGE_PER_PAGE** less than **FREQ_END - FREQ_BEGIN**;
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Switch to multi-page during regular One Screen application run. Restart the ESP32 on screen after the logo press the P button.
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### Mute Audio Notifications
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Restart ESP32, and on the logo display, press the P button.
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### Pause Execution
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Press P for more than 2 seconds. Execution will pause, and the scan's current Mhz position will be shown on the display.
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If less, ESP32 will turn off. Fast pressing(less than 0.5 second) P button changes the notification level
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## VSCode Platform.IO development env installation
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1. Install VSCode
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2. install Platform.IO extension
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3. Connect ESP32 to USB. Install USB CP2101 drivers for Windows or other OS
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https://docs.heltec.org/general/establish_serial_connection.html#for-windows
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https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers?tab=downloads
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5. Clone this Git Repo or download zip of the sources
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```bash
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git clone https://github.com/Genaker/LoraSA.git
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```
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NOTE: in you case name will be Just LoraSA. I have LoraSA2 because I already have LoraSA folder
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6. Open the Project with the VS code Platform.IO
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7. Select Proper Environment
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8. Select ESP32 USB Device to program
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Note: It is theoretically possible to program via WiFi and BTH.
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9. Program your ESP32
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10. Wait until you are done with the compilation and upload.
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Usually takes 1 minute. The first run is slower. It needs to compile all libraries.
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You will have the UCOG SA logo and spectrum analyzing scanning screen when done.
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## Hardware
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Heltec ESP32 Lora V3:
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<https://www.amazon.com/Heltec-Development-863-870MHz-ESP32-S3FN8-902-928MHz/dp/B0D1H1FN9Y/>
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<https://heltec.org/project/wifi-lora-32-v3/>
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<https://www.aliexpress.us/item/3256807037422978.html>
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Or Heltec Wireless Stick. The same hardware but without or with a smaller display
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https://heltec.org/project/wireless-stick-v3/
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https://heltec.org/project/wireless-stick-lite-v2/
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Heltec Vision Master E290 - With large e-ink display 293x128:
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https://heltec.org/project/vision-master-e290/
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https://www.aliexpress.us/item/3256807048047234.html
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**NOTE: to upload a new code, you need to press BOOT + RESET button**
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Battery with Wire JT connector :
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<https://www.amazon.com/EEMB-2000mAh-Battery-Rechargeable-Connector/dp/B08214DJLJ>
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## 3D printed case
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<https://www.printables.com/model/118750-heltec-lora-32-case-for-meshtastic>
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<https://www.thingiverse.com/thing:3125854>
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<https://thangs.com/designer/Snake0017/3d-model/Heltec%20LoRa%2032%20Desktop%20%26%20Vehicle%20Enclosure-40844>
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or buy :
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<https://www.amazon.com/DIYmalls-ESP32-OLED-WiFi-Type-C/dp/B0BR3MQ9BG>
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<https://www.thingiverse.com/thing:6522462>
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## Heltec ESP32 Lora v3 Pin Map
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We are using pin 41 as a Buzzer trigger. Connect buzzer + leg with pin 41 and - leg with the ground (GND). You can change the buzzer pin in the code.
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