T-Echo TTGO Meshtastic Wireless Module
User Guide
About This Guide
This document is intended to help users set up the basic software development environment for developing applications using hardware based on the T-Echo.
Through a simple example, this document illustrates how to use Arduino, including the menu based configuration wizard, compiling the Arduino and firmware download to the NRF52840 module.
Release Notes
| Date | Version | Release notes |
| 2022.08 | V1.0 | First release. |
Introduction
1.1. T-Echo
T-Echo is a development board. It can work independently. It consists of NRF52840 SOC, LoRa chip SX1262 and GNSS module.
The nRF52840 is fully multiprotocol capable with full protocol concurrency. It has protocol support for Bluetooth LE.
The nRF52840 is built around the 32-bit ARM® Cortex™-M4 CPU with floating point unit running at 64 MHz. The ARM TrustZone® CryptoCell cryptographic unit is included onchip and brings an extensive range of cryptographic options that execute highly efficiently independent of the CPU. It has numerous digital peripherals and interfaces such as high speed SPI and QSPI for interfacing to external flash and displays, PDM and I2S for digital microphones and audio, and a full speed USB device for data transfer and power supply for battery recharging.
Xinyuan provides the basic hardware and software resources that empowers application developers to build their ideas around the NRF52 series hardware. The software development framework provided by Xinyuan is intended for rapidly developing Internetof-Things (IoT) applications, with LoRa, Bluetooth, GPS and flexible power management and other advanced system features.
T-Echo can also be hand-held, wall-mounted or placed on a table to run.
1.2. Arduino
A set of cross-platform applications written in Java. The Arduino Software IDE is derived from the Processing programming language and the integrated development environment of the Wiring program. Users can develop applications in Windows/Linux/MacOS based on Arduino. It is recommended to use Windows 10. Windows OS has been used as an example in this document for illustration purposes.
1.3. Preparation
To develop applications for NRF52840 you need:
- PC loaded with either Windows, Linux or Mac operating system
- Toolchain to build the Application for NRF52840
- Arduino that essentially contains API for NRF52840 and scripts to operate the Toolchain
- The NRF52840 board itself and a USB cable to connect it to the PC.
2.1. Download the Arduino Software
The quickest how to install the Arduino Software (IDE) on Windows machines
2.1.1. Quick Start Guide
The website provides a quick start tutorial
- Windows:
https://www.arduino.cc/en/Guide/Windows - Linux:
https://www.arduino.cc/en/Guide/Linux - Mac OS X:
https://www.arduino.cc/en/Guide/MacOSX
2.1.2. Installation steps for Windows platform Arduino
Enter the download interface, select Windows installer to install directly
2.2. Install the Arduino Software
Wait for installation
Configure
3.1 Install nRF52 Environment
Open Arduino, open preferences
-> add https://adafruit.github.io/arduino-board-index/package_adafruit_index.json to the board installation manager address list
Open the board installation manager, wait for the index update to complete, select ‘Adafruit nRF52 by Adafruit’ and click install
Connect
You are almost there. To be able to proceed further, connect board to PC, check under what serial port the board is visible and verify if serial communication works.
T-Echo Softre
Test Demo
Open https://github.com/Xinyuan-LilyGO/T-Echo
Download the zip file
Copy all the folders in the lib directory to “C:\User\<YourName>\Documents\Arduino\libraries”
Upload Sketch
6.1. Select Board
Tools << Board << Nordic nRF52840(PCA10056)
6.2. Upload
Sketch << Upload 
FCC Caution:
Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
IMPORTANT NOTE:
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
Documents / Resources
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LILYGO T-Echo TTGO Meshtastic Wireless Module [pdf] User Guide T-ECHO, TECHO, 2ASYE-T-ECHO, 2ASYETECHO, T-Echo TTGO Meshtastic Wireless Module, T-Echo Wireless Module, TTGO Meshtastic Wireless Module, Meshtastic Wireless Module, TTGO Wireless Module, Wireless Module, Module |
