Programming LoRa-E5 with Arduino, LoRa-E5 mini Point to Point Comminucation over 24 km

Products & Technology LoRa
21

Hi there,

Pretty Stellar IMO, :+1: Got any pics of the DUT’s ? What Antenna’s
Great info.

GL :slight_smile: PJ :v:

22

Thank you for the excellent report.

23

The DUT are the wio-e5-le mini and the antennas are the supplied ones that come with the dev kit. I believe they have a gain of 2.8dBi.

I have been looking into the radio laws in europe. If im not mistaken I think i can operate 869.4 MHz - 869.65 MHz and transmit 500mW of power at a 10% duty cycle. Regional Limitations of RF Use in LoRaWAN | The Things Network

The E5-LE i believe can output up to 20.8dBm so this could be an option to increase range?

I want to do some tests to see how reducing SF but increasing power might help with distance. Theres a trade off and im not entirely sure what it is.

1 Like
24

Hi,

By compilation “STM32WL_SimpleP2P_master.ino” I got error:

STM32WL_SimpleP2P_master.ino:62:26: error: cannot convert ‘const uint32_t [3]’ {aka ‘const long unsigned int [3]’} to ‘const uint32_t (&)[5]’ {aka ‘const long unsigned int (&)[5]’}
62 | radio.setRfSwitchTable(rfswitch_pins, rfswitch_table);

I set Lora boards / Lora-E5 mini

Please let me know why this error occured, and what is wrong? Thank you

25

try downgrading your radio lib to 6.4.2

26 
// BSP : STM32 boards groups by STMicroelectronics 2.7.1
// Borad select : STM Boards groups / LoRa boars
// Board part number : LoRa-E5 mini (Board to be selected from Tools submenu 'Board part number)

#include <RadioLib.h>           // 6.4.2  https://github.com/jgromes/RadioLib

Please verify the BSP and library versions.

27

im writing up my lora adventures here to if you want to follow?

3 Likes
28

This are some stellar results, i’m gobsmacked.
Especilly with kit antennas. I usually find them tuned to wierd frequencies, out of my stack of 10-15 alegedly 433 and 868 MHZ antennas I found one, that was tuned to 433…after removing abs housing, with sleeve it was 405MHz . Rest wasn’t even in the ballpark like 433MHz rs485 modules sold with multiband antennas tuned for 2.5GHz, 1.6GHz 1GHz and 530MHz… I started doubting NanoVNA, but quick range test confirmed antenas were shite.

Long story short bravo seedstudio for those Antenas.

29

i have a custom board with lora e5 hf I FLASHED both master and slave code in the transmitter and riecevef board but no communication is happening between both boards

30

@sreerajsenan2854 Check that the MCU boots. Add a UART debug message immediately after startup:

printf(“System Started\r\n”);

If nothing prints, the firmware may not be running.

31

Hi sreerajsenan2854,

We need a little more information.

32

i flashed STM32WL_SimpleP2P_slave code and STM32WL_SimpleP2P_master code from the above zip file of you in two of my custom boards but the comunication between them is not working i didnt connected an external antenna because both boards are near by i will also share the google drive link of my custom board schematic
drive [dot] google [dot] com / drive / folders / 1C8nIdGnrMyNoqU7zo9UxHIQ2RXI4DGtS

cant able attach the link thats why addwed like this

33

I was unable to access drive.google.com/drive/folders/1C8nIdGnrMyNoqU7zo9UxHIQ2RXI4DGtS.

  1. Be sure to connect the antenna to protect the transmitter.
  2. I would like to know the exact model number (link) of the LoRa E5 HF.
  3. What does the serial monitor display?
  4. What is the CPU of the host uploading the sketch?
34

1. I am currently testing without an external antenna. The master and slave boards are placed about 15 cm apart.

2. I am using the Seeed LoRa-E5 HF module (IC21046-LORAE5HF) on my custom PCB.

3. No UART is connected, so I am not using the Serial Monitor.

4. The sketch is uploaded directly to the STM32WLE5JC inside the LoRa-E5 module using ST-LINK (SWD). There is no separate host MCU.

If you can provide your email address, I will share the Google Drive folder with you. The forum does not allow me to attach the required documents or links, so I will grant you access directly.

35

  1. Be sure to connect the antenna to protect the transmitter.

  2. You mentioned there’s no UART, but you haven’t left the while(!Serial); in your sketch as is, have you?

  3. Please take a look at lines 27 and 28 of STM32WL_SimpleP2P_slave.ino.

  4. If you click on my “ms” icon, you should be able to send me a message directly.

2 Likes
36

Hi there,

More than likely cooked… :face_with_spiral_eyes: You can’t do that.
pretty sure there’s a warning against that in the wiki. :crossed_fingers:

HTH
GL :slight_smile: PJ :v: