LILYGO T-Echo Card is a thin development kit based on Nordic Semi nRF52840 wireless MCU and a Semtech SX1262 LoRa transceiver with a solar panel for charging an 800 mAh battery. It supports Bluetooth 5, NFC, Bluetooth Mesh, ANT, 802.15.4 (Zigbee/Thread), LoRaWAN, and GNSS (L76K module) connectivity.The board also features a 0.42-inch OLED information display, a magnetic USB interface, a 9-axis motion sensor, a digital microphone, a speaker, and an RGB LED for status/notifications. It’s mainly useful for off-grid communication (text and audio), GNSS location sharing, personal/asset tracking, and as a compact mesh network node.T-Echo Card specifications:
SoC – Nordic Semiconductor nRF52840
CPU – 32-bit Arm Cortex-M4F microcontroller @ 64 MHz
Memory/Storage – 1 MB Flash, 256 KB RAM
Wireless – Bluetooth 5, NFC, Bluetooth Mesh, 802.15.4 (Zigbee/Thread), ANT, 2.4 GHz proprietary
