Mesh Node T114 (Rev. 2.0), nRF52840 + SX1262 LoRa Node +GPS, Meshtastic and LoRaWAN Compatible

Summary

Mesh Node T114 is a Low Power Consumption development board based on nRF52840 and SX1262 and supports LoRa and Bluetooth 5.0. which integrates various power interfaces (5V USB, lithium battery, and solar panel), an optional 1.14-inch TFT display, and a GPS module as accessories, and has powerful long-distance communication capabilities, scalability, and low power design.

With Heltec nRF52 development environment and libraries. you can use it for LoRa/LoRaWAN development work, and also use it to run some open source projects, such as Meshtastic.

Mesh Node T114 has been upgraded to the Rev2.0 version with the following changes made :

•  The circuit board was changed from 4 layers to 6 layers so that both the RF part and the crystal oscillator part can obtain a more complete ground.
• The circuit was changed from lead-free to immersion gold process, which is more friendly to signal transmission.
• The position of some components was adjusted.
•  The RF path was optimized according to the six-layer board structure.
• The direction of the 2.4GHz Bluetooth antenna and IPEX LoRa antenna interface was changed to make them farther away.
• Now the high-frequency Mesh node T114 can stably send long data packets in the “Long_Fast” channel of Meshtastic.

Main Features

• MCU nRF52840 (Bluetooth), LoRa chipset SX1262.
• Powerful display function (optional), onboard 1.14 inch TFT-LCD display contains 135(H)RGB x240(V) dots and can display up to 262k colors.
• Low power consumption, 11 uA in deep sleep.
• Operation condition: -20 ~ 70℃, 90%RH(No condensing).
• Type-C USB interface with a complete voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures.
• Compatible with Arduino, we provide development frameworks and libraries.
• Various Interfaces: 1.25*2P LiPo connector, 1.25*2P Solar panel connector, 1.25*8P GNSS module connector, which greatly increase the extensibility of the board.

Specifications

Parameters	Description
MCU	nRF52840
LoRa Node Chip	SX1262
Frequency	470~510MHz; 863~870MHz; 902~928MHZ.
Max. TX Power	21±1dBm
Max. Receiving sensitivity	-135dBm@SF12 BW=125KHz
Bluetooth	Bluetooth LE: Bluetooth 5, Bluetooth mesh
Hardware Resource	USB 2.0, 4 * SPI, 2 * TWI, 2 * UART, 4 * PWM, QPSI, 12S, PDM, QDEC Etc.
Memory	1M ROM 256KB SRAM
Interface	Type-C USB 2*1.25 lithium battery connector 2*1.25 solar panel connector LoRa ANT (IPEX1.0) 8*1.25 GPS module connector 2*13*2.54 Header Pin
Battery	3~4.2V battery power supply and charge.
Operating Temperature	-20 ~ 70 ℃
Dimensions	50.80*22.86mm
Electrical characteristics	Deep Sleep: ~11uA Tracker mode sleep: ~22uA GPS OFF, TFT OFF: ~9mA GPS OFF, TFT ON: ~20mA GPS ON, TFT ON: ~51mA
Display	onboard 1.14 inch TFT-LCD display

Description

Pin Map

High light

Low Power Consumption

Meshtastic enter low power consumption mode, the current is only 23uA.

Entering LoRaWAN deep sleep mode, the current is only 11uA.

Powerful communication capability

supports LoRa and Bluetooth 5.0.

optional 1.14 inch TFT display and GPS module as accessories.

Plastic support plate

A transparent plastic support platform is installed between the PCB and the monitor.

Protect the electronic components of the circuit board and enhance its heat dissipation.

Highly extensible

integrate multiple power interfaces, 5V USB, lithium battery, solar panel.

provid abundant pins and hardware resources.

Dimension

FAQ

Can the onboard 2.4GHz antenna be replaced?

The 2.4GHz antenna is a multilayer ceramic antenna for BlueTooth communications, it can’t be replaced.

What development methods does it support?

• Arduino
• PlatformIO

In addition to Meshtastic support, we have also developed a complete LoRaWAN protocol in the nRF52 Arduino framework.

What’s the battery socket type?

You can find this type of socket by search “SH1.25 x 2”.

What is the maximum size of battery supported by the default casing?

The maximum capacity of the shell for carrying batteries is 42 * 28mm, and the default 3.7V lithium battery size is 41 * 24mm

How to enter meshtastic on the screenless version of mesh node 114?

Just download the screenless version firmware and enter the 123456 password.

What is the acceptable battery range for the solar panel connected to mesh node 114?

5V~6.5V, it is recommended to connect solar panels with a voltage of around 5V.

Regarding the long chars send issue

Not time ago, customer reports that some of the Mesh Node T114 works as a Meshtastic device and tries to send long strings (>50 chars) ONLY in Long-Fast mode (SF11, 250K BW), sometimes sending messages may fail.

• For a detailed description of this matter, please refer to this link:

https://github.com/meshtastic/firmware/issues/4723#issuecomment-2369336696

• For a detailed report, Heltec solution, and compensation regarding this matter, please refer to this link

https://github.com/meshtastic/firmware/issues/4723#issuecomment-2404889735

Does 433MHz and 470MHz version has long chars sending issue?

With our detailed and long time testing, there is NO issue with long packet transmission in versions 433MHz and 470MHz, so they are not included in the compensation list.

But in response to users’ demand for the 433 and 470 hardware V2 versions, our engineers are debugging the corresponding hardware. It will be released soon.

Docs & Resource

• [Docs] — User Manual
• [Resource] —Heltec nRF52 framework and Lib
• [Resource] —SnapEmu IoT Platform
• [Attachment] — V1.x Shematic diagram
• [Attachment] — V2.x Schematic diagram
• [Attachment] — Datasheet
• [Attachment] — TFT-LCD Datasheet
• [Resource] — Related Resources

Project

Ultrasonic Sensor Distance Measurement with LoRaWAN

Packing list

The default packing list without selecting any accessories is as follows:

Item	Quantity
Mesh Node T114	x1
LoRa Antenna	x1
SH1.25×2 Battery Connector	x2
2.54 *13 Header Pin	x2
L76K GNSS (Available when GPS selected)	x1
Protect Shell and Transfer LoRa antenna (Available when Shell selected)	x1