T-Echo Lite Kit get it now

Overview

T-Echo Lite Kit is the T-Echo Lite mainboard combined with the KeyShield accessory baseboard. The KeyShield adds a 5×4 physical keyboard (TCA8418), ES8311 audio codec with speaker and earphone jack, AW21009QNR keyboard backlight, and a vibration motor — plus optional GPS (L76K) and IMU (ICM20948) sockets. The combination provides a complete portable communication terminal built on the nRF52840 with LoRa SX1262, 1.22-inch e-paper display, and ultra-low deep-sleep power consumption.

Quick Start

Firmware Flash

Using LILYGO Spark (Recommended)

Download LILYGO Spark, search for T-Echo Lite Kit, and flash the firmware directly.

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Open the T-Echo-Lite project folder
4. Open platformio.ini, uncomment the example you want under [platformio] → default_envs
5. If first time: run python t-echo-lite_v1.0.0_setup.py from the tool/win10 vscode platformio start folder to install the board
6. Click ✓ to compile, connect the board, click → to upload

Arduino

1. Install Arduino IDE
2. In Preferences, add https://www.adafruit.com/package_adafruit_index.json to Additional Board Manager URLs
3. In Board Manager, install Adafruit nRF52
4. Copy library folders from the project libraries directory to your Arduino Sketchbook libraries folder
5. In Tools → Board, select Nordic nRF52840 DK
6. Enter DFU boot mode: press and release RST, wait for LED1 to light, then press and release RST again. LED1 will dim then brighten — DFU mode is active.
7. Click ✓ to compile, then → to upload

Example Support

T-Echo-Lite Examples

Example	Support	Description
Battery_Measurement	✓	Battery voltage reading
BLE_Uart	✓	BLE UART communication
Display	✓	E-Paper display
GPS	✓	GPS positioning
ICM20948	✓	IMU sensor
SX126x_PingPong	✓	LoRa ping-pong
Sleep_Wake_Up	✓	Deep sleep & wake
Original_Test	✓	Factory test

T-Echo-Lite-KeyShield Examples

Example	Support	Description
aw21009qnr	✓	Keyboard backlight
aw86224	✓	Vibration motor
es8311	✓	Speaker / microphone
tca8418	✓	Keyboard
original_test	✓	Factory test

Related Videos

Key Features

• nRF52840 ARM Cortex-M4 @ 64 MHz, Bluetooth 5.0, 256 kB RAM, 1 MB Flash
• SX1262 LoRa (400–520 MHz / 830–945 MHz), SPI
• 1.22-inch GDEM0122T61 E-Paper display (176 × 192), driver SSD1681
• 5×4 physical keyboard via TCA8418 keyboard controller (I2C)
• AW21009QNR keyboard backlight (I2C)
• ES8311 audio codec — speaker + earphone jack (I2C + I2S)
• Vibration motor (I2C)
• Optional ICM20948 9-axis IMU (I2C)
• Optional L76K GNSS module (UART)
• Key button (IO 0.24)
• Deep sleep power consumption: 2–10 µA minimum

Specifications

Parameter	Value
MCU	nRF52840, ARM Cortex-M4 @ 64 MHz
RAM	256 kB
Flash (MCU)	1 MB
Bluetooth	Bluetooth 5.0
LoRa	SX1262, 400–520 MHz / 830–945 MHz
Display	1.22-inch GDEM0122T61 E-Paper, 176 × 192
Keyboard	TCA8418 (5×4), I2C 0x34
Keyboard Backlight	AW21009QNR, I2C
Audio	ES8311, I2C 0x34
IMU (optional)	ICM20948, I2C
GNSS (optional)	L76K, UART
Deep Sleep	2–10 µA

Pin Diagram

E-Paper Display (1.22-inch, 176×192)

GDEM0122T61	BS1	BUSY	RST	DC	CS	SCLK	MOSI
nRF52840	IO 1.12	IO 0.03	IO 0.28	IO 0.21	IO 0.22	IO 0.19	IO 0.20

ES8311 Audio

ES8311	SDA	SCL	Address
nRF52840	IO 1.4	IO 1.2	0x34

Vibration Motor

Vibration Motor	SDA	SCL
nRF52840	IO 1.4	IO 1.2

LoRa SX1262

SX1262	CS	RST	SCLK	MOSI	MISO	BUSY	DIO1 / INT	DIO2	RF_VC1	RF_VC2
nRF52840	IO 0.11	IO 0.07	IO 0.13	IO 0.15	IO 0.17	IO 0.14	IO 1.8	IO 0.05	IO 0.27	IO 1.1

Keyboard (TCA8418)

TCA8418	SDA	SCL	Address
nRF52840	IO 1.4	IO 1.2	0x34

Key Button

Function	Pin
Key	IO 0.24

IMU ICM20948 (Optional)

ICM20948	SDA	SCL	INT
nRF52840	IO 1.4	IO 1.2	IO 0.16

GNSS L76K (Optional)

L76K	RX	TX	1PPS	WAKE
nRF52840	IO 1.13	IO 1.15	IO 0.29	IO 1.10

Dimensions

Schematic

• T-Echo-Lite V1.0 Schematic
• T-Echo-Lite-Eapper V1.0 Schematic

Datasheet

• nRF52840 Datasheet
• GDEM0122T61 (E-Paper)
• SSD1681 (E-Paper Driver)
• S62F (SX1262 Module)
• L76KB-A58 (GNSS)
• ICM20948

Software Libraries

• T-Echo-Lite GitHub Repository

Dependent Libraries

• Adafruit_EPD
• Adafruit_BusIO
• Adafruit_SPIFlash
• Adafruit-GFX-Library
• RadioLib
• TinyGPSPlus
• ICM20948_WE
• cpp_bus_driver

FAQ

• Q. No debug output from USB? A. Enable the DTR option in your serial assistant software.

• Q. USB upload fails? A. Enter DFU boot mode: press and release RST, wait for LED1 to light, press and release RST again. LED1 will dim then brighten — DFU mode is active.

• Q. Arduino IDE prompts to upgrade libraries? A. Do not upgrade — stay with the library versions included in the project.

• Q. E-paper display shows ghosting? A. GDEM0122T61 does not support fast refresh. Use full refresh only.

Changelog

Version	Date	Notes
V1.0	—	Initial release