Heltec T114 v2
Overview
Heltec Mesh Node T114 (Rev. 2.0) is an IoT development board designed and produced by Heltec Automation(TM). It combines an nRF52840 microcontroller with an SX1262 LoRa transceiver, optional 1.14” TFT display, and GNSS support. It is compatible with Meshtastic and LoRaWAN. See the Heltec Mesh Node T114 pages [1] for more details.
The features include the following:
Microprocessor: Nordic nRF52840 (ARM Cortex-M4F, 64 MHz, 256 KB RAM, 1 MB flash)
LoRa node chip: Semtech SX1262
Optional onboard 1.14” 135×240 TFT display (ST7789V, SPI)
GNSS module interface (NMEA over UART)
USB-C interface with USB device (CDC ACM) support
BLE 5.0, IEEE 802.15.4 (OpenThread)
One user button, one green LED, SK6812 RGB LED strip (2 LEDs)
Li-Po battery & solar panel 2*1.25mm connector
2*13*2.54mm expansion pin headers
Supported Features
The heltec_t114_v2 board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
heltec_t114_v2/nrf52840 target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
ADC |
on-chip |
Nordic Semiconductor nRF family SAADC node1 |
|
ARM architecture |
on-chip |
Nordic UICR (User Information Configuration Registers)1 |
|
on-chip |
Nordic EGU (Event Generator Unit)6 |
||
on-chip |
Nordic nRF family ACL (Access Control List)1 |
||
on-chip |
Nordic nRF family MWU (Memory Watch Unit)1 |
||
Audio |
on-chip |
Nordic PDM (Pulse Density Modulation interface)1 |
|
Clock control |
on-chip |
Nordic nRF clock control node1 |
|
on-chip |
Nordic nRF high-frequency crystal oscillator (nRF52 series)1 |
||
Comparator |
on-chip |
Nordic nRF COMP (analog COMParator)1 |
|
Counter |
on-chip |
Nordic nRF timer node5 |
|
Cryptographic accelerator |
on-chip |
Nordic ECB (AES electronic codebook mode encryption)1 |
|
on-chip |
Nordic nRF family CCM (AES CCM mode encryption)1 |
||
on-chip |
ARM TrustZone CryptoCell 3101 |
||
Debug |
on-chip |
ARMv7 instrumentation trace macrocell1 |
|
Display |
on-board |
Sitronix ST7789V display controller1 |
|
Flash controller |
on-chip |
Nordic NVMC (Non-Volatile Memory Controller)1 |
|
on-chip |
Properties defining the interface for the Nordic QSPI peripheral1 |
||
GNSS |
on-board |
Generic GNSS NMEA receiver1 |
|
GPIO & Headers |
on-chip |
NRF5 GPIOTE1 |
|
on-chip |
NRF5 GPIO2 |
||
I2C |
on-chip |
Nordic nRF family TWIM (TWI master with EasyDMA)2 |
|
I2S |
on-chip |
Nordic I2S (Inter-IC sound interface)1 |
|
IEEE 802.15.4 |
on-chip |
Nordic nRF IEEE 802.15.4 node1 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
LED strip |
on-board |
Worldsemi WS2812 LED strip, GPIO binding1 |
|
LoRa |
on-board |
Semtech SX1262 LoRa Modem1 |
|
Miscellaneous |
on-chip |
Nordic FICR (Factory Information Configuration Registers)1 |
|
on-chip |
Nordic nRF family PPI (Programmable Peripheral Interconnect)1 |
||
MTD |
on-chip |
Flash node1 |
|
Networking |
on-chip |
Nordic nRF family RADIO peripheral1 |
|
on-chip |
Nordic nRF family NFCT (Near Field Communication Tag)1 |
||
Pin control |
on-chip |
Nordic nRF family Pin Controller1 |
|
Power management |
on-chip |
Nordic nRF power control node1 |
|
PWM |
on-chip |
nRF PWM4 |
|
on-chip |
nRFx S/W PWM1 |
||
Regulator |
on-chip |
Nordic nRF5X regulator (fixed stage of the core supply)1 |
|
on-chip |
Nordic nRF52X regulator (high voltage stage of the main supply)1 |
||
Retained memory |
on-chip |
Nordic GPREGRET (General Purpose Register Retention) device2 |
|
RNG |
on-chip |
Nordic nRF family RNG (Random Number Generator)1 |
|
RTC |
on-chip |
Nordic nRF RTC (Real-Time Counter)3 |
|
Sensors |
on-chip |
Nordic nRF family TEMP node1 |
|
on-chip |
Nordic nRF quadrature decoder (QDEC) node1 |
||
Serial controller |
on-chip |
||
SPI |
on-chip |
||
on-chip |
Nordic nRF family SPI (SPI master)1 |
||
SRAM |
on-chip |
Generic on-chip SRAM1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
USB |
on-chip |
Nordic nRF52 USB device controller1 |
|
Watchdog |
on-chip |
Nordic nRF family WDT (Watchdog Timer)1 |
heltec_t114_v2/nrf52840/uf2 target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
ADC |
on-chip |
Nordic Semiconductor nRF family SAADC node1 |
|
ARM architecture |
on-chip |
Nordic UICR (User Information Configuration Registers)1 |
|
on-chip |
Nordic EGU (Event Generator Unit)6 |
||
on-chip |
Nordic nRF family ACL (Access Control List)1 |
||
on-chip |
Nordic nRF family MWU (Memory Watch Unit)1 |
||
Audio |
on-chip |
Nordic PDM (Pulse Density Modulation interface)1 |
|
Clock control |
on-chip |
Nordic nRF clock control node1 |
|
on-chip |
Nordic nRF high-frequency crystal oscillator (nRF52 series)1 |
||
Comparator |
on-chip |
Nordic nRF COMP (analog COMParator)1 |
|
Counter |
on-chip |
Nordic nRF timer node5 |
|
Cryptographic accelerator |
on-chip |
Nordic ECB (AES electronic codebook mode encryption)1 |
|
on-chip |
Nordic nRF family CCM (AES CCM mode encryption)1 |
||
on-chip |
ARM TrustZone CryptoCell 3101 |
||
Debug |
on-chip |
ARMv7 instrumentation trace macrocell1 |
|
Display |
on-board |
Sitronix ST7789V display controller1 |
|
Flash controller |
on-chip |
Nordic NVMC (Non-Volatile Memory Controller)1 |
|
on-chip |
Properties defining the interface for the Nordic QSPI peripheral1 |
||
GNSS |
on-board |
Generic GNSS NMEA receiver1 |
|
GPIO & Headers |
on-chip |
NRF5 GPIOTE1 |
|
on-chip |
NRF5 GPIO2 |
||
I2C |
on-chip |
Nordic nRF family TWIM (TWI master with EasyDMA)2 |
|
I2S |
on-chip |
Nordic I2S (Inter-IC sound interface)1 |
|
IEEE 802.15.4 |
on-chip |
Nordic nRF IEEE 802.15.4 node1 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
LED strip |
on-board |
Worldsemi WS2812 LED strip, GPIO binding1 |
|
LoRa |
on-board |
Semtech SX1262 LoRa Modem1 |
|
Miscellaneous |
on-chip |
Nordic FICR (Factory Information Configuration Registers)1 |
|
on-chip |
Nordic nRF family PPI (Programmable Peripheral Interconnect)1 |
||
MTD |
on-chip |
Flash node1 |
|
on-chip |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Networking |
on-chip |
Nordic nRF family RADIO peripheral1 |
|
on-chip |
Nordic nRF family NFCT (Near Field Communication Tag)1 |
||
Pin control |
on-chip |
Nordic nRF family Pin Controller1 |
|
Power management |
on-chip |
Nordic nRF power control node1 |
|
PWM |
on-chip |
nRF PWM4 |
|
on-chip |
nRFx S/W PWM1 |
||
Regulator |
on-chip |
Nordic nRF5X regulator (fixed stage of the core supply)1 |
|
on-chip |
Nordic nRF52X regulator (high voltage stage of the main supply)1 |
||
Retained memory |
on-chip |
Nordic GPREGRET (General Purpose Register Retention) device2 |
|
RNG |
on-chip |
Nordic nRF family RNG (Random Number Generator)1 |
|
RTC |
on-chip |
Nordic nRF RTC (Real-Time Counter)3 |
|
Sensors |
on-chip |
Nordic nRF family TEMP node1 |
|
on-chip |
Nordic nRF quadrature decoder (QDEC) node1 |
||
Serial controller |
on-chip |
||
SPI |
on-chip |
||
on-chip |
Nordic nRF family SPI (SPI master)1 |
||
SRAM |
on-chip |
Generic on-chip SRAM1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
USB |
on-chip |
Nordic nRF52 USB device controller1 |
|
Watchdog |
on-chip |
Nordic nRF family WDT (Watchdog Timer)1 |
See the Heltec Mesh Node T114 pages [1] for a complete list of board hardware features.
Connections and IOs
LED
LED4 (green) = P1.03
System Requirements
Host machine with USB port
USB-C cable for programming and serial console (CDC ACM)
Optional: J-Link or other SWD debugger for debugging
Optional: UF2 bootloader for drag-and-drop flashing; build with the
heltec_t114_v2/nrf52840/uf2board target
Programming and Debugging
The heltec_t114_v2 board supports the runners and associated west commands listed below.
| flash | debug | rtt | debugserver | attach | reset | |
|---|---|---|---|---|---|---|
| jlink | ✅ | ✅ (default) | ✅ | ✅ | ✅ | ✅ |
| pyocd | ✅ | ✅ | ✅ | ✅ | ✅ | |
| uf2 | ✅ (default) |
The default heltec_t114_v2/nrf52840 target uses the standard Nordic nRF52840
partition layout (full flash image, no Nordic nRF5 SDK bootloader / MBR link
offset). Use the heltec_t114_v2/nrf52840/uf2 variant when building for the
board’s UF2 bootloader and its application partition layout.
Applications for the heltec_t114_v2/nrf52840 board configuration can be built,
flashed, and debugged in the usual way. See Building an Application and
Run an Application for more details on building and running.
Flashing
First, run your favorite terminal program to listen for output (e.g. 115200 baud). Then build and flash. Example for the Blinky application:
west build -b heltec_t114_v2/nrf52840 samples/basic/blinky
west flash
For the UF2 bootloader variant (drag-and-drop firmware):
west build -b heltec_t114_v2/nrf52840/uf2 samples/basic/blinky
west flash
Debugging
Debugging is supported via SWD. Use an nRF52-compatible probe (e.g. nRF52840 DK, J-Link) and connect SWDIO, SWDCLK, GND, and VDD. Refer to the Nordic nRF5x Segger J-Link page to learn about debugging Nordic boards with a Segger IC. OpenOCD and Zephyr’s debug runner can also be used with the appropriate board configuration.