STM32 LoRa text messenger

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.
See github for details.

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.

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

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