LoRa/LoRaWAN finding the right devices to use
# helpd
diego.ar
03/03/2023, 6:21 PMHi there, thanks in advance for any help
I need to run some tests to evaluate the LoRa protocol, and i have been checking a bit on Toit language and i see it would be great to use it on the project. I dont see at a first glance any device ESP32 based that could be used, to run Toit on it and also with LoRa capabilities, is this possible? can you suggest any PCB that could be used for this purpose? On the other hand, i have some TTGO boards that implement LoRa and even are based on ESP32, i guess i cant run Toit over this kind of boards, this correct?
Thank you, looking forward to an answer.. cheers
o
Oliver M
03/03/2023, 7:41 PMThe TTGO T-BEAM has both an ESP32 and LoRa.
Oliver M
03/03/2023, 7:41 PMAnd I'm running Toit on one. Though not using LoRa myself atm
f
floitsch
03/03/2023, 7:56 PMWe had LoRa running at some point, but there aren't any public drivers at the moment.
I don't think the protocol is particularly difficult though.
And as @Oliver M said: pretty much all ESP32 boards should run Toit. It's then just a matter of getting the LoRa part to work.
d
diego.ar
03/03/2023, 9:30 PMthank you, i'm using TTGO TBEAM as well, great to hear toit runs ok
ill keep doing
k
kasperl
03/04/2023, 8:54 AMI think we have some (pretty old) LoRa driver code somewhere. Probably for the RFM95. It might serve as inspiration.
kasperl
03/04/2023, 8:55 AMAt least that is also a SPI-based driver IIRC.
d
diego.ar
03/07/2023, 6:18 PMthanks for the response, good to hear there is a LoRa driver, even it is for a RFM95, would be really helpful.. i guess ttgo tbeam comes with a semtech SX127x .. pls let me know if this driver is avaialble for download
k
kasperl
03/07/2023, 6:20 PM@diego.ar I'll find the bits tomorrow and see if they still compile 🙂
d
diego.ar
03/07/2023, 6:29 PMsure great @kasperl
looking forward to your comments
k
kasperl
03/08/2023, 1:25 PMd
diego.ar
03/08/2023, 11:10 PMgreat @kasperl ill see what becomes easier.. tweak the code to make it work on a semtech sx127x or get a esp32 board with a rfm95 and try this driver as it is now
ill let you know either way, thks
diego.ar
03/11/2023, 8:07 PMhey @Oliver M after doing the right configs ive got toit running on the TTGO TBeam boards.. thks
diego.ar
05/09/2023, 2:38 AMHey guys, i would like to give it a try to the SX1276 chip, in order to send/recevice messages using LoRa on a toit program.. i have been checking the code you provided for the RFM95 chip, i detail (below) the code analysis i could perform, really i dont know where to start to adapt the code and make it work for the SX1276; any help and/or guidance is very much appreciated
Here my comments/notes after reading the code:
RFM95 Toit driver
Code overview:
361 lines of code
Uses gpio, monitor, serial and spi librarys
- line 9, main block configures spi, device and lora device
- line 23, read task, just prints/acknowledges whatever is received
- line 28, main loop, sends "hello world" + counter, sleeps 1sec
- line 35 to 89, constants config
- line 98: constructor device/serial.Device
- line 135: set_mode_ method
- line 142: write method
- line 172: read method
- line 204 to 361, the rest of the methods of the RFM95 class
is_transmitting_:
set_coding_rate4 denominator:
set_preamble_length length:
set_spreading_factor sf:
set_signal_bandwidth sbw:
get_signal_bandwidth:
enable_crc:
disable_crc:
get_spreading_factor:
explicit_header_mode_:
implicit_header_mode_:
set_tx_power_ level boost:
set_frequency_ hz:
set_OCP_ mA:
set_ldo_flag_:
sleep_:
diego.ar
05/15/2023, 1:39 AMhello @kasperl @floitsch @Oliver M after making some small adjusts on the code of the RFM95 driver, it works fine for a SX1276 based PCB.. thank you regards
k
kasperl
05/15/2023, 3:55 AMThat's great, @diego.ar!
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