This ESP32 Handheld Sends Off-Grid Texts
Sending a text message means reaching for a phone and relying on a cellular network or an internet connection for delivery. But if all you need is a way for two devices to exchange messages over a short distance, neither of those things is actually required. That's the idea behind a handheld communicator developed by Volos Projects, which uses a pair of ESP32-C6 development boards and Espressif's ESP-NOW protocol to create a completely self-contained messaging system.
Each unit is built around a Waveshare ESP32-C6 development board with a 2.16-inch, 480×480 AMOLED touchscreen. The ESP32-C6 combines a 160 MHz single-core RISC-V processor with built-in Wi-Fi 6, Bluetooth 5, and IEEE 802.15.4 wireless support, while the board also includes a real-time clock, six-axis IMU, microSD card slot, USB-C charging circuitry, and connectors for a microphone and speaker. Power comes from a 1,000 mAh LiPo battery mounted inside the enclosure, allowing each communicator...
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