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The LILYGO T-Echo is a device based around the nRF52840 microcontroller and the SX1262 LoRa transceiver.

• Models

• Firmware

• Bootloader

• References

• External links

The T-Echo comes in two variants. One features a LoRa module labeled with 433/470, while the other is labeled with 868/915. While these labels indicate the approximate frequency ranges they operate on, the exact supported ranges are not listed.

There is also an upgraded model, known as the T-Echo Plus, which features a larger 2400 mAh battery. The T-Echo Plus comes in both frequency variants.

The T-Echo is supported by the official RNode firmware as of version 1.81.cite-ref-1[1] It is also supported by the microReticulum firmware as of version 1.86.4.cite-ref-2[2]

The original bootloader that comes flashed to the T-Echo works fine for most use cases. However, to enable OTA firmware updates, the OTAFIX bootloader can be flashed to the device instead. This allows for the device's firmware to be updated over Bluetooth.

cite-note-11. ↑ "Release 1.81".

cite-note-22. ↑ "Release 1.86.4".

• T-Echo

• T-Echo Plus

• T-Echo

• T-Echo Plus

Manufacturer: LILYGO

Type: Mobile device

Price: US$49.11

MCU: nRF52840

CPU: Cortex-M4 @ 64 MHz

Memory: 256 kB SRAM 1 MB Flash (On-chip) 2 MB Flash (Onboard)

Display: 1.54-inch E-paper 200 × 200 px

GNSS: L76K

Power source: 5 V USB Type-C 3.7 V 850 mAh LiPo

Dimensions: 127 × 53.8 × 24.3 mm

Transceiver IC: nRF52840

PHY modes: 2M, Coded

Output power: 8 dBm (6 mW)

Sensitivity: -95 dBm @ 1 Mbps

Antenna type: SMD Ceramic

Transceiver IC: SX1262

PHY modes: FSK, LoRa, LR-FHSS

Frequency range: 433/470 MHz or 868/915 MHz

Output power: 22 dBm (160 mW)

Antenna type: External SMA