The `!Heltec Mesh Node T114`!, simply referred to as the `!T114`!, is a development board based around the nRF52840 microcontroller and the SX1262 LoRa transceiver.

>>Contents

• `F0af`_`[Models`#models]`_`f

• `F0af`_`[Firmware`#firmware]`_`f

• `F0af`_`[Bootloader`#bootloader]`_`f

• `F0af`_`[References`#references]`_`f

• `F0af`_`[External links`#external-links]`_`f

>>Models

There are two models of the T114. The `*HT-n5262-HF`* operates on frequencies between 863 and 928 MHz, while the `*HT-n5262-LF`* operates on the lower-frequency 433 and 470 MHz band.

>>Firmware

The T114 is supported by the official `F0af`_`[RNode`:/page/wiki.mu`path=RNode]`_`f firmware as of version 1.80.`:cite-ref-1[`F5bf`_`[1`#cite-note-1]`_`f]

>>Bootloader

To enable OTA firmware updates on the T114, the OTAFIX bootloader can be flashed to the board. This allows for the board's firmware to be updated over Bluetooth, which is especially useful when updating solar nodes in hard-to-reach places. However, for this feature to be useful, the firmware must provide a way to remotely put the board into device firmware upgrade (DFU) mode. Entering DFU mode normally requires physical access to the device.

>>References

`:cite-note-1`!1.`! `F0af`_`[↑`#cite-ref-1]`_`f "Release 1.80".

>>External links

• Official website

• Datasheet

>>Heltec Mesh Node T114

`!Also known as:`! T114

`!Manufacturer:`! Heltec Automation

`!Type:`! Development board

`!Price:`! US$17.90

`!MCU:`! nRF52840

`!CPU:`! Cortex-M4 @ 64 MHz

`!Memory:`! 256 kB SRAM 1 MB Flash

`!Display:`! 1.14-inch TN TFT LCD 240 × 135 px

`!GNSS:`! External L76K

`!Power source:`! 5 V USB Type-C 3.7 V Li-ion Battery 6 V Solar Panel

`!Dimensions:`! 50.8 × 22.9 mm

>>>Bluetooth LE

`!Transceiver IC:`! nRF52840

`!PHY modes:`! 2M, Coded

`!Output power:`! 8 dBm (6 mW)

`!Sensitivity:`! -95 dBm @ 1 Mbps

`!Antenna type:`! SMD Ceramic

>>>Sub-GHz LoRa

`!Transceiver IC:`! SX1262

`!PHY modes:`! FSK, LoRa, LR-FHSS

`!Frequency range:`! 433–510 MHz or 863–928 MHz

`!Output power:`! 21 dBm (125 mW)

`!Sensitivity:`! -135 dBm @ `F0af`_`[SF`:/page/wiki.mu`path=LoRa_parameters|anchor=spreading-factor]`_`f12 `F0af`_`[BW`:/page/wiki.mu`path=LoRa_parameters|anchor=bandwidth]`_`f 125 KHz

`!Antenna type:`! External u.FL