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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.

• Models

• Firmware

• Bootloader

• References

• External links

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.

The T114 is supported by the official RNode firmware as of version 1.80.cite-ref-1[1]

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.

cite-note-11. ↑ "Release 1.80".

• Official website

• Datasheet

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

Transceiver IC: nRF52840

PHY modes: 2M, Coded

Output power: 8 dBm (6 mW)

Sensitivity: -95 dBm @ 1 Mbps

Antenna type: SMD Ceramic

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 @ SF12 BW 125 KHz

Antenna type: External u.FL