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  4. 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

ParametersDescription
Parameters MCUDescription nRF52840
Parameters LoRa Node ChipDescription SX1262
Parameters FrequencyDescription 470~510MHz;
863~870MHz;
902~928MHZ.
Parameters Max. TX PowerDescription 21±1dBm
Parameters Max. Receiving sensitivityDescription -135dBm@SF12 BW=125KHz
Parameters BluetoothDescription Bluetooth LE: Bluetooth 5, Bluetooth mesh
Parameters Hardware Resource Description USB 2.0, 4 * SPI, 2 * TWI, 2 * UART, 4 * PWM, QPSI, 12S, PDM, QDEC Etc.
Parameters MemoryDescription 1M ROM
256KB SRAM
Parameters InterfaceDescription 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
Parameters Battery Description 3~4.2V battery power supply and charge.
Parameters Operating Temperature Description -20 ~ 70 ℃
Parameters Dimensions Description 50.80*22.86mm
Parameters Electrical characteristicsDescription Deep Sleep: ~11uA
Tracker mode sleep: ~22uA
GPS OFF, TFT OFF: ~9mA
GPS OFF, TFT ON: ~20mA
GPS ON, TFT ON: ~51mA
Parameters DisplayDescription onboard 1.14 inch TFT-LCD display

Description

Pin Map

High light

Highly extensible

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

provid abundant pins and hardware resources.

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.

Low Power Consumption

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

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

 

Dimension

FAQ

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

  • Arduino
  • PlatformIO

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

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

The maximum capacity of the shell for carrying batteries is 42 * 28*11mm, and the default 3.7V lithium battery size is 40 * 25*10mm

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

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

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

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

Project

Ultrasonic Sensor Distance Measurement with LoRaWAN

Packing list

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

ItemQuantity
Item Mesh Node T114Quantity x1
Item LoRa AntennaQuantity x1
Item SH1.25×2 Battery ConnectorQuantity x2
Item 2.54 *13 Header PinQuantity x2
Item L76K GNSS (Available when GPS selected)Quantity x1
Item Protect Shell and Transfer LoRa antenna (Available when Shell selected)Quantity x1

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

$27.90 – $41.70

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