CircuitMess Chatter 2.0
DIY encrypted LoRa communicator kit building a pair of devices for off-grid text messaging up to 2km range. Features ESP32, LLCC68 LoRa radio, and 160×128 TFT display.
$217.00
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Specifications
Components
Espressif ESP32-WROOM-32 module with dual-core Xtensa LX6 at 240MHz, WiFi 802.11 b/g/n, BLE 4.2, 520KB SRAM, and 4MB flash.
Semtech LLCC68 LoRa transceiver operating at 868MHz for long-range encrypted messaging up to 2km. Supports LoRa and FSK modulation.
Sitronix ST7735S TFT LCD controller driving a 160×128 pixel color display over SPI.
Two daisy-chained 74HC165 parallel-in/serial-out shift registers reading the 16-button keypad via 3 GPIO pins (DATA, CLOCK, LOAD).
Bus Interfaces
GPIO Map
Overview
The CircuitMess Chatter 2.0 is a DIY electronics kit that builds a pair of encrypted wireless communicators. Using LoRa (Long Range) radio technology via the LLCC68 transceiver, the two devices can exchange encrypted text messages at distances up to 2 kilometers without any WiFi or cellular network — completely off-grid.
Each communicator features an ESP32 microcontroller, a 160×128 color TFT display, a 16-key keypad input via 74HC165 shift registers, a piezo buzzer for notifications, and a USB-C port for charging and programming. Assembly takes approximately 2 hours with detailed step-by-step instructions.
The Chatter 2.0 is fully programmable through CircuitBlocks visual coding or Arduino IDE. The community has also ported Meshtastic firmware to the Chatter 2.0, enabling mesh networking and integration with the broader Meshtastic ecosystem for extended range communication.
Use Cases
5Off-Grid Communication
Text messaging and data exchange in areas without cellular or internet coverage.
LoRa Messenger
Build an off-grid text messaging device using LoRa for range and low power.
STEM Education
Educational kits and boards designed to teach science, technology, engineering, and math concepts through hands-on projects.
Emergency Communication
Off-grid emergency communication device for disaster response and outdoor safety scenarios.
LoRa Mesh Networking
Building off-grid mesh communication networks using LoRa radio for text messaging, location sharing, and sensor data relay without cellular or internet infrastructure.
Resources
Where to Buy
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