Heltec T114 Mesh Node Owner’s Manual

Heltec T114 Mesh Node

Specifications

• Product Name: Mesh Node T114
• Model: T114
• Batch/Serial Number: 1005007917409559
• MCU: nRF52840 (Bluetooth)
• LoRa Chipset: SX1262
• Display: 1.14 inch TFT-LCD (Optional) – 135(H)RGB x 240(V)
  dots, up to 262k colors
• Interfaces: 2*1.25mm LiPo connector, 2*1.25mm Solar panel
  connector, 8*1.25mm GNSS module connector
• Operating Conditions: -20°C to 70°C, 90% RH
  (Non-condensing)

Product Usage Instructions

Safety & Warnings:

Read all instructions before use. Failure to follow these instructions may result in damage to the product or personal injury.

• Do not plug or unplug chips, modules, or wires when the device is powered on.
• Handle with care; do not press, drop, or touch exposed pins with metal tools.
• Place in a well-ventilated and dry area; keep away from heat sources and direct sunlight.

Instructions for Use

Mandatory steps for using the Mesh Node T114:

1. Ensure the device is powered off before making any connections.
2. Connect necessary peripherals using the provided interfaces.
3. If using the optional TFT-LCD display, follow the display setup instructions.
4. Operate the device within the specified temperature and humidity range.
5. Refer to the provided Arduino development frameworks and libraries for programming guidance.

Product Informaton

• Product Name: [Mesh Node T114]
• Model: [T114]
• Batch/Serial Number: [1005007917409559]

Compliance Information

Symbol explanation
Indicates that the product complies with the essential requirements of the relevant European directives and serves as evidence that the product has passed the corresponding conformity assessment procedures and/or manufacturer’s declaration of conformity

Important Safety Information

Safety & Warnings

Read all instructions before use. Failure to follow these instructions may result in damage to the product or personal injury.

1. Warning: Keep the device and its cord out of reach of children under 3 years old.
2. Keep away from children unless supervised by an adult.
3. Do not use this product for purposes other than its intended use (for R&D and learning only).
4. Inspect the product before each use; do not use if damaged (e.g., broken cord, damaged interface).
5. Follow installation and operation guidelines to avoid injury and device damage.
6. This is an electrical product; do not expose to water or moisture.
7. Use a qualified power adapter matching the device’s rated specifications; do not reverse positiveand n egative poles.
8. Do not plug or unplug chips, modules or wires when the device is powered on.
9. Handle with care; do not press, drop or touch exposed pins with metal tools.
10. Place in a well-ventilated and dry area; keep away from heat sources and direct sunlight.

Instructions for Use

Mesh Node T114Document Version

Version	Time	Description	Remark
Rev. 1.0	2024-5-16	Preliminary version	Richard
Rev. 2.0	2024-10-18	V2	Richard

Copyright Notice
All contents in the files are protected by copyright law, and all copyrights are reserved by Chengdu Heltec Automation Technology Co., Ltd. (hereinafter referred to as Heltec). Without written permission, all commercial use of the files from Heltec are forbidden, such as copy, distribute, reproduce the files, etc., but non-commercial purposes, downloading or printing by individuals is welcome.

Disclaimer
Chengdu Heltec Automation Technology Co., Ltd. reserves the right to change, modify or improve the document and product described herein. Its contents are subject to change without notice. These instructions are intended for you use.

Description

Overview
Mesh Node T114 is a development board based on nRF52840 and SX1262, supports LoRa communication and Bluetooth 5.0, and provides a variety of power interfaces (5V USB, lithium battery and solar panel), optional 1.14 inch TFT display and GPS module as accessories.
Mesh Node T114 has powerful long-distance communication capabilities, scalability, and low power design, which make it excellent in a wide range of application scenarios such as smart cities, agricultural monitoring, logistics tracking, etc. With Heltec nRF52 development environment and libraries , you can use it for
LoRa/LoRaWAN development work, as well as to run some open source projects, such as Meshtastic.
Mesh Node T114 are available in 2 product variants①:

No.	Model	Description
1	HT-n5262-LF	470~510MHz working LoRa frequency, used for China   mainland (CN470) LPW band.
2	HT-n5262-HF	For EU868, IN865, US915, AU915, AS923, KR920 and other LPW networks with operating frequencies between 863~928MHz.

Product Features

• MCU nRF52840 (Bluetooth), LoRa chipset SX1262.
• Low power consumption, 11 uA in deep sleep.
• Powerful display function (optional), onboard 1.14 inch TFT-LCD display contains 135(H)RGB x240(V) dots and can display up to 262k colors.
• Type-C USB interface with a complete voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures.
• Various Interfaces (2*1.25mm LiPo connector, 2*1.25mm Solar panel connector, 8*1.25mm GNSS module connector) which greatly increase the extensibility of the board.
• Operation condition: -20 ~ 70℃, 90%RH(No condensing).
• Compatible with Arduino,and we provide Arduino development frameworks and libraries.

Pin Definition
About SPI, I2C, UART, PWM, QPSI, I2S, PDM, QDEC: Each IO pin is preconfigured with IO_MUX functionality, which means you can use any GPIO as peripheral pins. You just need to define these pins in your code.
However, it’s important to note that once a pin is used, it may affect other functions associated with that pin. For information, please refer to the Schemaic diagram.

Pin Map

Pin Definition

p1                                                                                       p2

Name	Type	Description		Name	Type	Description
5V	P	5V Power.		Ve	P	3V3 power.
GND	P	Ground.		GND	P	Ground.
3V3	P	3.3V Power.		0.08	I/O	GPIO8.
GND	P	Ground.		0.07	I/O	GPIO7.
0.13	I/O	GPIO13.		1.12	I/O	GPIO44.

0.16	I/O	GPIO16.		1.14	I/O	GPIO46.
RST	I/O	RESET.		0.05	I/O	GPIO5.
1.01	I/O	GPIO33.		1.15	I/O	GPIO47.
SWD	I/O	SWDIO.		1.13	I/O	GPIO45.
SWC	I/O	SWCLK.		0.31	I/O	GPIO31.
SWO	I/O	SWO.		0.29	I/O	GPIO29.
0.09	I/O	GPIO9, UART1_RX.		0.30	I/O	GPIO30.
0.10	I/O	GPIO10, UART1_TX.		0.28	I/O	GPIO28.

Specifications

Parameters	Description
MCU	nRF52840
LoRa Chipset	SX1262
Memory	1M ROM; 256KB SRAM
Bluetooth	Bluetooth 5, Bluetooth mesh, BLE.
Storage temperature	-30~80℃
Operating temperature	-20~70℃
Operating Humidity	90%(No condensing)
Power Supply	3~5.5V (USB), 3~4.2(Battery)
Display Module	LH114T-IF03
Screen Size	1.14 Inch
Display Resolution	135RGB x 240

Active Area	22.7 mm(H) × 42.72(V) mm
Display Colors	262K
Hardware Resource	USB 2.0, 2*RGB, 2*Button, 4*SPI, 2*TWI, 2*UART, 4*PWM, QPSI, I2S, PDM, QDEC Etc.
Interface	Type-C USB, 2*1.25 lithium battery connector, 2*1.25 solar panel connector, LoRa ANT (IPEX1.0), 8*1.25 GPS module connector, 2*13*2.54 Header Pin
Dimensions	50.80mm x 22.86mm
Operating Current	1A

Power Consumption

Mode	Condition	Consumption(Battry@3.7V)
		470MHz	868MHz	915MHz
LoRa_TX	5dBm		83mA	93mA
	10dBm		108mA	122mA
	15dBm		136mA	151mA
	20dBm		157mA	164mA
BT	UART	93mA
	Scan	132mA
Sleep		11uA
Operating Current		1A

LoRa RF Characteristics

Transmit Power

470~510	21 ± 1
863~870	21 ± 1
902~928	21 ± 1

Receiving Sensitivity

 The following table gives the sensitivity level typically

Signal Bandwidth/[KHz]	Spreading Factor	Sensitivity/[dBm]
125	SF12	-135
125	SF10	-130
125	SF7	-124

Operation Frequencies
Mesh Node T114 supports LoRaWAN frequency channels and models corresponding table.

Region	Frequency (MHz)	Model
EU433	433.175~434.665	HT-n5262-LF
CN470	470~510	HT-n5262-LF
IN868	865~867	HT-n5262-HF
EU868	863~870	HT-n5262-HF
US915	902~928	HT-n5262-HF
AU915	915~928	HT-n5262-HF
KR920	920~923	HT-n5262-HF
AS923	920~925	HT-n5262-HF

Physical Dimensions

 

Resource

Develop framework and lib

• Heltec nRF52 framework and Lib

Recommendation server

• Heltec LoRaWAN test server based on TTS V3
• SnapEmu IoT Platform

Documents

• Mesh Node T114 Manual Document

Schematic Diagram

• V1Schematic Diagram
• V2Schematic Diagram

Related Resource

• TFT-LCD Datasheet

Heltec Contact Information

• Heltec Automation Technology Co., Ltd
• https://heltec.org

FAQs

Q: Can I use the Mesh Node T114 with other LPW networks?

• A: Yes, the Mesh Node T114 supports various LPW networks with operating frequencies between 863~928MHz.

Q: What is the power consumption of the Mesh Node T114 in deep sleep?

• A: The device consumes only 11 uA in deep sleep mode, ensuring low power usage.