STM32 LoRa text messenger

Description

V1.1 update: You don't need to calibrate touch positions anymore. Not even compile the sources.
See github for details!!

Cheap communication device with on-screen touch keyboard much easier to build then hardware qwerty.
There is 10 lines of text on the screen, all messages are logged to SD.
Single message is limited to 53 symbols just to fit one line of the screen.

Hardware connections:
TFT, SD, LoRa and Touch SPI:
SCK - PA5
MISO - PA6
MOSI - PA7
Other:
TFT reset - reset
TFT LED - PA2 (30sec timeout)
TFT SS - PA4
SD SS - PA3
Touch SS - PB11
TFT DC - PA1
Touch irq - PB10
LoRa irq - PB1
LoRa reset - PB0
LoRa SS - PA0
i2c:
DS3231 SDA - PB7
DS3231 SCL - PB6

https://github.com/Airrr17/LoRa_messenger

Details

As for now program set to tr\rx broadcast plain text messages only.

Means everyone with a such device can communicate in swarm.

Once you need privet and\or encrypted communication change

the source code. Lines 161-165. For more security use AESLib.

Files

LoRa-chat.v1.1.bin

Version 1.1 compiled.

octet-stream - 48.28 kB - 05/23/2021 at 00:36

Download

Components

1 × Blue pill STM32 board 64k or 128k

1 × ili9341 320x240 TFT with touch and SD SPI

1 × DS3231 RTC With battery

1 × RA-02 LoRa module SPI

1 × Frequency matched antenna. Mine is ~17cm for 433mHz

Discussions

Sziklai wrote 06/13/2022 at 17:04

Yes. with ESP8266 or 32 it is possible to use web page instead of lcd to receive and send...

Try Heltek's LORA board. Very handy.

Here is code for you to start from.

https://github.com/Airrr17/LoRa_messenger/blob/master/LoRa-Heltek.ino

It's already receives and sends lora packets. Just add some web server to this code and enjoy :)

ops wrong thread.

Are you sure? yes | no

Sziklai wrote 05/20/2022 at 22:03

teraz, what is your goal? To combine lora with tcp-ip? There is already a bunch of solutions.

Im much sure you can easily adopt this sketch to esp32 that have tcp.

Are you sure? yes | no

teraz wrote 04/22/2022 at 16:27

ok, is possible using fuzix or normal unix?

Are you sure? yes | no

teraz wrote 09/06/2021 at 17:40

ar You planing to move raspberry pi pico or other 2040 cpu board?

Are you sure? yes | no

Sziklai wrote 04/18/2022 at 12:57

Why to move? This stm32 even far form power of esp8266.

All this sketch works on 64k flash stm32. That's enough.

Are you sure? yes | no

teraz wrote 04/23/2022 at 09:03

ok, tell me is possible connect this device to router? internet?

meybe creating a web page for sending message? or integrate this with matrix?

(power eficient is important, You are right)

Are you sure? yes | no

STM32 LoRa text messenger

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Description

Details

Files

LoRa-chat.v1.1.bin

Components

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