Heltec Mesh Node T114

• Product page: Mesh Node T114 (Rev. 2.0) - Heltec Automation
• Schematic: MeshNode-T114_V2.0_SCH(2).pdf (Rev 2.0)
• MCU: Espressif ESP32-C3
• LoRa: Semtech SX1262
• Displays:
  • Screen: Yes, TFT LCD (optional)
  • User controllable LED(s): Yes, 1 × Green LED (GPIO P1.03 → 32 + 3 = 35)
  • ARGB LED(s): Yes, 2 × SK6812 ARGB “neopixel” (GPIO P0.14 → 14)
• Radios:
  • LoRa: Yes
  • BLE: Yes
  • Wi-Fi: No
  • GPS: Yes (optional)

• Mesh Node T114
  • 2 × (1.25 mm × 2) Molex PicoBlade to bare wire 15 cm pigtails (for solar panel and battery wiring)
  • 1 × IPEX-1 to (internal) coil antenna
  • 2 × (13 × 1) 2.54mm pin headers (unsoldered)
• Optional: TFT LCD & supporting frame (pre-assembled)
• Optional: Quectel L76K module and cable assembly
• Optional: Translucent blue (iMac G3 “blueberry” color) enclosure
  • 1 × IPEX-1 pigtail to right-angle SMA-K
  • 1 × 868/915 dualband LoRa antenna
  • 4 × (M1.5 × 20 mm) self tapping screws (last 10 mm is threaded)

Heltec Mesh Node T114 is a low-power, pager-style device that was designed with Meshtastic in mind.

• Portable Meshtastic device

• Firmware PR: meshtastic/firmware#4226
• Protobufs PR: meshtastic/protobufs#527

Hardware Rev. 1.0 has instability sending messages around or longer than 50 characters on LongFast LoRa preset due to insufficient buffering on the voltage supply to the SX1262 LoRa transceiver IC. Heavier transmit duty cycles also cause Bluetooth instability.

This can be fixed by adding a capacitor on the 3V3 trace behind the SX1626 IC.

These deficiencies have been fully addressed in Rev. 2.0, and free replacements will be shipped after contacting support@heltec.cn with your Heltec AliExpress store or Heltec store order number.