📡 The HELTEC Mesh Node T114 is an ultra-efficient dev board built on the nRF52840 and SX1262 chipsets, offering dual support for LoRa and Bluetooth 5.0. Engineered for flexibility, it features multiple power input options (🔌 USB 5V, 🔋 Li-ion battery, and ☀️ solar panel), an optional 1.14" TFT screen, and compatibility with GPS modules. Its long-range communication, modular expandability, and energy-saving architecture make it ideal for Meshtastic, LoRaWAN, and a wide range of IoT applications. 🚀 Tap into the Heltec nRF52 ecosystem and development tools to jumpstart your LoRa/LoRaWAN projects, or use it as a foundation for open-source platforms like Meshtastic. 🔧 Key Improvements in Rev2.0: 📶 Enhanced RF Performance: The PCB has been upgraded from 4 to 6 layers, providing a more complete ground plane for both the RF section and the crystal oscillator. ⚡ Improved Signal Integrity: The circuit now uses an immersion gold process, enhancing signal transmission. 📐 Optimized Layout: Component placement and RF path design have been optimized for the six-layer board structure. 📡 Reduced Interference: The direction of the 2.4GHz Bluetooth antenna and IPEX LoRa antenna interface has been adjusted to increase separation and minimize interference. 📨 Stable Long Data Packets: The high-frequency Mesh Node T114 can now reliably send long data packets in the "Long_Fast" channel of Meshtastic. 🌟 Main Features of HELTEC Mesh Node T114 V2 🔗 Dual Connectivity: MCU nRF52840 (Bluetooth), LoRa chipset SX1262. 🖥️ Optional Display: Powerful display function with an onboard 1.14-inch TFT-LCD display (135(H)RGB x240(V) dots, up to 262k colors). 🌙 Ultra-Low Power: Deep sleep mode consuming only 11 uA. 🌡️ Wide Operating Range: Suitable for environments from -20 ~ 70℃, 90%RH (Non-condensing). 🔌 Robust Interface: Type-C USB interface with voltage regulator, ESD protection, short circuit protection, and RF shielding. 🛠️ Arduino Compatibility: Compatible with the Arduino IDE; Heltec provides comprehensive development frameworks and libraries. 🔋 Flexible Power Options: 1.25*2P LiPo connector, 1.25*2P Solar panel connector. 📍 GNSS Ready: 1.25*8P GNSS module connector for GPS integration. 📊 Specifications of HELTEC Mesh Node T114 V2 Parameters Description MCU nRF52840 LoRa Node Chip SX1262 Frequency 470~510MHz; 863~870MHz; 902~928MHZ. Max. TX Power 21±1dBm Max. Receiving sensitivity -135dBm@SF12 BW=125KHz Bluetooth Bluetooth LE: Bluetooth 5, Bluetooth mesh Hardware Resource USB 2.0, 4 * SPI, 2 * TWI, 2 * UART, 4 * PWM, QPSI, 12S, PDM, QDEC Etc. Memory 1M ROM, 256KB SRAM 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 Battery 3~4.2V battery power supply and charge. Operating Temperature -20 ~ 70 ℃ Dimensions 50.80*22.86mm Electrical characteristics Deep Sleep: ~11uA; Tracker mode sleep: ~22uA; GPS OFF, TFT OFF: ~9mA; GPS OFF, TFT ON: ~20mA; GPS ON, TFT ON: ~51mA Display Onboard 1.14 inch TFT-LCD display ✨ Highlights 🔌 Highly Extensible: Integrates multiple power interfaces: 5V USB, lithium battery, solar panel. Provides abundant pins and hardware resources. 🌙 Low Power Consumption: In Meshtastic low power consumption mode, the current is only 23uA. In LoRaWAN deep sleep mode, the current is only 11uA. 📡 Powerful Communication Capability: Supports LoRa and Bluetooth 5.0. Offers an optional 1.14-inch TFT display and GPS module. 🛡️ Protective Design: A transparent plastic support platform is installed between the PCB and the monitor for component protection and heat dissipation. 📍 Pin Map 📐 Dimension ❓ FAQ 🔧 Can the onboard 2.4GHz antenna be replaced? The 2.4GHz antenna is a multilayer ceramic antenna for Bluetooth communications and cannot be replaced. 💻 What development methods does it support? 🛠️ Arduino ⚙️ PlatformIO In addition to Meshtastic support, we have also developed a complete LoRaWAN protocol in the nRF52 Arduino framework. 🔌 What’s the battery socket type? You can find this type of socket by searching “SH1.25 x 2”. 🔋 What is the maximum size of battery supported by the default casing? The maximum capacity of the shell for carrying batteries is 42 × 28 × 11mm, and the default 3.7V lithium battery size is 40 × 25 × 10mm. 📲 How to enter Meshtastic on the screenless version of Mesh Node T114? Just download the screenless version firmware and enter the 123456 password. ☀️ What is the acceptable battery range for the solar panel connected to Mesh Node 114? 5V~6.5V, it is recommended to connect solar panels with a voltage of around 5V. 📨 Regarding the long chars send issue: Not long ago, customers reported that some Mesh Node T114 devices running Meshtastic and sending long strings (>50 chars) ONLY in Long-Fast mode (SF11, 250K BW) may occasionally fail. 📎 For a detailed description of this matter, please refer to this link: https://github.com/meshtastic/firmware/issues/4723#issuecomment-2369336696 📝 For a detailed report, Heltec solution, and compensation regarding this matter, please refer to this link: https://github.com/meshtastic/firmware/issues/4723#issuecomment-2404889735 📡 Does 433MHz and 470MHz version have long chars sending issue? After extensive testing, there is NO issue with long packet transmission in 433MHz and 470MHz versions, so they are not included in the compensation list. 🧪 In response to user demand for 433 and 470 hardware V2 versions, our engineers are debugging the corresponding hardware. It will be released soon. 📚 Resource 📘 [Docs] — User Manual 🧰 [Resource] — Heltec nRF52 framework and Lib 🌐 [Resource] — SnapEmu IoT Platform 📎 [Attachment] — V1.x Schematic diagram 📎 [Attachment] — V2.x Schematic diagram 📄 [Attachment] — Datasheet 🖥️ [Attachment] — TFT-LCD Datasheet 📦 [Resource] — Related Resources 📦 Packing List The default packing list (without optional accessories) includes: 📦 Item 🔢 Quantity Mesh Node T114 x1 LoRa Antenna x1 🔌 SH1.25×2 Battery Connector x2 📍 2.54 *13 Header Pin x2 📡 L76K GNSS (GPS) x1 Projects Ultrasonic Sensor Distance Measurement with LoRaWAN
