You are on a variation of my communicator/pager main project. I wanted to create a super small lora communicator to send and receive short messages.
After numerous iterations in the last 2 years, I made this small hybrid device: a LORA pager + a true 2G GSM phone, with the possibility to create a gateway between the 2 worlds.
- The microcontroler is an ESP32 DEV BORD with a battery/charging area.
- The GSM module is a SIM800L
- The LORA module is a RFM95 chip (433 , 868, 910 Mhz possible)
- The microphone is a small electret mic
The display is an IPS SPI 240x240 Color TFT with high resolution.
You also have a buzzer to warn you when a call or a message is arrived
You also have a Joystick to compose your messages or navigate through the menus.
Everythong is ARDUINO IDE compatible.