Heltec Mesh Node T114 Rev. 2.0 – nRF52840 SX1262 LoRa and Bluetooth Meshtastic LoRaWAN module

Summary

The Heltec Mesh Node T114 (Rev. 2.0) is the go-to module for anyone interested in autonomous mesh communications and long-range connected devices. Combining the power and energy efficiency of the Nordic nRF52840 SoC with the radio sensitivity of the LoRa SX1262 chipset, this node is specifically designed for building off-grid Meshtastic networks, GPS tracking beacons or LoRaWAN sensors with very long battery life.

Key features

• Extreme energy efficiency: Thanks to the nRF52840 MCU, the module consumes just 11 µA in deep sleep and 23 µA in Meshtastic sleep mode, significantly outperforming traditional ESP32 solutions.
• Superior RF performance: Equipped with the Semtech SX1262 LoRa chipset, delivering up to +21 dBm of transmit power and a receive sensitivity as low as -135 dBm.
• Solar-ready: Natively integrates regulation and charging circuits for a 3.7V LiPo battery, as well as a direct input for a 5V–6.5V solar panel.
• Open and flexible ecosystem: Immediate compatibility with Meshtastic, Meshcore and LoRaWAN (OTA/ABP) firmware, and easily programmable using the Arduino IDE or PlatformIO.
• Comprehensive expansion connectivity: Dedicated ports for a 1.14" colour TFT display, a GPS/GNSS geolocation module, and RF shielding with ESD and short-circuit protection.

Technical specifications

• Microcontroller (MCU): Nordic Semiconductor nRF52840 (ARM Cortex-M4 with FPU)
• Memory: 1 MB Flash ROM, 256 KB SRAM
• LoRa transceiver: Semtech SX1262
• Supported frequency bands: EU868 (863–870 MHz), US915 (902–928 MHz), EU433 (433.175–434.665 MHz), CN470 (470–510 MHz)
• Max. transmit power: 21 ± 1 dBm
• Receive sensitivity: -135 dBm (@SF12, BW=125 kHz), -130 dBm (@SF10), -124 dBm (@SF7)
• Bluetooth: Bluetooth 5.0 Low Energy (BLE), Bluetooth Mesh (built-in 2.4 GHz ceramic antenna)
• Power connections: USB Type-C port, 2-pin SH1.25 LiPo connector, 2-pin SH1.25 solar panel connector
• Supply voltage range: USB 3.0 to 5.5 V, LiPo battery 3.0 to 4.2 V, solar input 5.0 to 6.5 V
• Measured power consumption: Deep sleep: ~11 µA / Meshtastic sleep mode: ~23 µA / GPS OFF, display OFF: ~9 mA / GPS ON, display ON: ~51 mA
• Hardware interfaces: USB 2.0, 4x SPI, 2x TWI (I2C), 2x UART, 4x PWM, I2S, PDM, QDEC, GPIOs configurable via IO_MUX
• LoRa antenna connector: IPEX 1.0 (U.FL) micro RF connector
• PCB dimensions: 50.80 x 22.86 mm
• Weight: 35 g
• Operating temperature: -20 °C to +70 °C

Compatibility

• Firmware and protocols: Meshtastic (nRF52 firmware), Meshcore, LoRaWAN 1.0.2 / 1.0.3 / 1.1 (via Heltec nRF52 stack).
• Development environments: Arduino IDE (Heltec frameworks and libraries), PlatformIO.
• Battery & solar connections: 2-pin connectors with SH1.25 mm pitch (JST-SH 1.25 mm 2-pin).
• Expansion modules: Heltec LH114T-IF03 1.14" TFT-LCD display (135x240 pixels), Heltec L76K GPS/GNSS modules (8-pin SH1.25 connector).
• RF connector: LoRa antennas with IPEX 1 (U.FL) connector or IPEX to SMA female adapter.

FAQ