LILYGO TTGO T-Echo NRF52840 LoRa Wireless Module User Manual

1. Producte acabatview

The LILYGO TTGO T-Echo is a versatile wireless communication module featuring the NRF52840 microcontroller, LoRa SX1262 transceiver, L76K GPS, and a 1.54-inch E-Paper display. This device is designed for long-range, low-power communication, making it suitable for off-grid messaging, tracking, and various IoT applications. It supports mesh networking protocols like Meshtastic, allowing devices to relay messages to extend communication range.

Figure 1: LILYGO TTGO T-Echo NRF52840 LoRa Wireless Module

2. Característiques clau

• Microcontrolador: NRF52840
• LoRa Transceiver: SX1262 (915MHz) for long-range, low-power communication.
• Mòdul GPS: L76K Multi-System Positioning GNSS (GPS, GLONASS, BeiDou, QZSS) with improved receiving and anti-interference attributes.
• Visualització: 1.54-inch E-Paper display (200x200 resolution, 2 grey levels, 2s full refresh time).
• Connectivitat sense fils: Bluetooth 5, Thread, Bluetooth Mesh, ANT, 802.15.4, Zigbee.
• Bus Interfaces: UART, SPI, TWI, PDM, I2S, QSPI.
• Memòria: 2MB Flash, 256KB RAM.
• Optional Sensor: BME280 temperature and pressure sensor (depending on model).

3. Contingut del paquet

Verifiqueu que tots els elements siguin presents al vostre paquet:

Figure 2: T-Echo module and USB cable

• 1 x SoftRF Motherboard
• 1 x Antena GPS
• 1 x LORA 915MHz Antenna
• 1 x NFC Antenna
• 1 x Touch Cable
• 1 x Jst 2pin1.25mm Battery Cable
• 1 x TYPE-C USB Cable
• 1 x 850mA Capacity Battery
• 1 x ABS Material Enclosure White

4. Identificació de components

Figura 3: Esquena view amb components etiquetats

Figure 4: Detailed Pinout Diagram

Figure 5: Button functions and LED indicators

5. Configuració

5.1 Hardware Assembly

The T-Echo module comes with an ABS enclosure. Follow these steps to assemble the device:

1. Connect the LoRa antenna to the module's SMA connector.
2. Carefully place the main board into the bottom part of the enclosure.
3. Connect the battery to the appropriate JST connector on the board.
4. Secure the battery within the enclosure, often using double-sided adhesive foam for isolation and stability.
5. Attach the top part of the enclosure and secure it with the provided screws.

5.2 Firmware Installation

To utilize the full capabilities of your LILYGO T-Echo, it is recommended to install the Meshtastic firmware. This firmware enables mesh networking capabilities for off-grid communication.

1. Download the Meshtastic firmware for the LILYGO T-Echo from the official Meshtastic weblloc.
2. Connect your T-Echo device to your computer using the provided USB-C cable.
3. Follow the instructions on the Meshtastic website or the provided video to flash the firmware onto your device. This typically involves using a web flasher tool or a command-line interface.

6. Instruccions de funcionament

6.1 Basic Device Operation

The T-Echo features two buttons (Button 1 and Button 2) and a touch interface for navigation and control, especially when running the SoftRF program. LED indicators provide visual feedback on device status.

• Botó 1:
• Press once to reset the device.
• Press twice to enter Programming Development Mode.
• Button 2 (when device is turned on, in button mode):
• Press once to change the display interface.
• Press twice to turn off/on the backlight.
• Premeu llargament per apagar el dispositiu.
• Interfície tàctil: Changes the display interface (available in SoftRF program).
• Indicadors LED:
• Red LED: USB power supply/charge indicator.
• Green LED: Battery power indicator.
• Blue LED: Bluetooth low energy work indicator.

Figure 6: Button functions and LED indicators

6.2 Enviament i recepció de missatges

After installing the Meshtastic firmware and connecting your device to a mobile phone via Bluetooth, you can use the Meshtastic app to send and receive text messages.

1. Ensure your T-Echo is powered on and connected to your phone via Bluetooth.
2. Open the Meshtastic application on your smartphone.
3. Select the desired channel or recipient within the app.
4. Type your message and send it. The T-Echo will transmit the message over the LoRa network.
5. Incoming messages will be displayed on the T-Echo's E-Paper screen and within the Meshtastic app.

7. Wiring and Sensor Integration

The LILYGO T-Echo can be integrated with external sensors and relays for various applications, such as door monitoring or remote control. The following diagram illustrates a typical wiring setup for a door monitoring system using a Hall Effect sensor and a relay.

8. Manteniment

• Càrrega de la bateria: Charge the device using the provided USB-C cable. The red LED indicates charging status, and the green LED indicates battery level.
• Actualitzacions de firmware: Periodically check the official Meshtastic weblloc web per a actualitzacions de firmware per garantir un rendiment òptim i l'accés a noves funcions.
• Neteja: Feu servir un drap suau i sec per netejar el dispositiu. Eviteu utilitzar productes químics agressius o materials abrasius.
• Emmagatzematge: Guardeu el dispositiu en un lloc fresc i sec, allunyat de la llum solar directa i de temperatures extremes.

9. Solució De Problemes

• El dispositiu no s'encén: Ensure the battery is charged. Connect the device to a power source via USB-C.
• Sense connexió Bluetooth: Verify Bluetooth is enabled on your smartphone and the T-Echo. Ensure the blue LED is active. Try restarting both devices.
• Unable to Send/Receive Messages: Check the LoRa antenna connection. Ensure both devices are within range and running compatible Meshtastic firmware. Verify channel settings in the Meshtastic app.
• El GPS no funciona: Ensure the GPS antenna is properly connected and the device has a clear view del cel.
• E-Paper Display Issues: If the display is unresponsive or shows artifacts, try resetting the device.

10. Especificacions

11. Garantia i Suport

For warranty information and technical support, please refer to the documentation provided with your purchase or visit the official LILYGO weblloc web. Els termes de garantia específics poden variar segons la regió i el distribuïdor.