Heltec Mesh Node T114

nRF52840 and SX1262 LoRa board with Bluetooth LE, optional GNSS and optional TFT. Rated 21 dBm; supported by Meshtastic, MeshCore and RNode.

Specifications
Maker	Heltec Automation
MCU	nRF52840
LoRa radio	SX1262
Max TX power	21 +/-1 dBm (Heltec)
Connectivity	Bluetooth 5 LE (no Wi-Fi)
Screen	Optional 1.14 inch TFT, 135x240
GPS	Not included by default; optional GNSS via an 8x1.25 connector
Battery	2x1.25 lithium connector, 3-4.2 V; solar input
Deep sleep current	11 uA (Heltec claim)

What it is

The Heltec Mesh Node T114 pairs an nRF52840 microcontroller with an SX1262 LoRa radio. It has Bluetooth 5 LE but no Wi-Fi. A 1.14 inch TFT and a GNSS module are optional extras rather than part of the base board. Heltec sells it in 433, 470-510, 863-870 and 902-928 MHz versions.

Heltec's product page lists only Rev 2.0 of the board. We did not confirm whether other revisions are sold elsewhere, so check which revision a listing is selling.

Who it suits

Best for: a low-power solar or battery repeater that you manage over Bluetooth, and for anyone who wants the nRF52 power profile in a Heltec form factor.

Not for: anyone who needs Wi-Fi. If you want an onboard GPS out of the box, look at a Wireless Tracker or T-Beam Supreme.

UK 868 MHz notes

Buy the 863-870 MHz (868) version, not 902-928 MHz. We did not capture Heltec's exact SKU wording for it, so check the listing. See Buy the right frequency.

The arithmetic (ours): e.r.p. = TX power in dBm + antenna gain in dBi - 2.15 - cable loss.

Antenna	e.r.p. at 21 dBm	25 mW sub-bands	500 mW slot (869.40-869.65 MHz)
0 dBi	18.85 dBm = 77 mW	Over	Within
2 dBi	20.85 dBm = 122 mW	Over	Within

Ofcom IR 2030 v1.16 (published 7 April 2026) allows 25 mW e.r.p. in most of the band and 500 mW e.r.p. at 869.40-869.65 MHz with a 10% duty cycle or listen-before-talk. Meshtastic's EU_868 region (869.4-869.65 MHz) sits in that slot.

Firmware

Meshtastic: supported.
MeshCore: supported ("Heltec T114" in the flasher catalog; heltec_t114 in the repository).
RNode / Reticulum: supported. The Reticulum manual lists the Heltec T114, and RNode_Firmware defines a model for it covering 863-928 MHz.

Flashing: Flash Meshtastic, Flash MeshCore, RNode and Reticulum setup.

Known quirks

To enter the bootloader, double-click the reset button and drop a UF2 file on the drive that appears. nRF52 boards need no serial driver.
Meshtastic's firmware assumes an L76K GNSS module for the optional GPS connector.
Attach the antenna before power.

Power

Heltec claims an 11 uA deep-sleep current. Heltec's product page also lists these figures under "Electrical characteristics": GPS off and TFT off about 9 mA; TFT on about 20 mA; GPS on and TFT on about 51 mA; and tracker-mode sleep about 22 uA. Heltec does not define the test state (for example, whether the radio is receiving or idle), so treat them as vendor figures, not a verified idle or receive current. Measure your own node. See Power for power-bank cut-off traps, which matter most for low-draw nRF52 nodes.

Guides: Flash Meshtastic, Flash MeshCore, RNode and Reticulum setup, Power, Antenna placement
Tools: Link budget calculator, Solar node sizing
Other boards: RAK WisBlock 4631 starter kit, Heltec WiFi LoRa 32 V3
Comparison: Meshtastic vs MeshCore