Mesh Node T114 (Rev. 2.0), nRF52840 SX1262 LoRa Node GPS, Meshtastic and LoRaWAN Compatible

Summary Mesh Node T114 is a Low Power Consumption development board based on nRF52840 and SX1262 and supports LoRa and Bluetooth 5.0. which integrates various power interfaces (5V USB, lithium battery, and solar panel), an optional 1.14-inch TFT display, and a GPS module as accessories, and has powerful long-distance communication capabilities, scalability, and low power design. With Heltec nRF52 development environment and libraries. you can use it for LoRa/LoRaWAN development work, and also use it to run some open source projects, such as Meshtastic. Mesh Node T114 has been upgraded to the Rev2.0 version with the following changes made :  The circuit board was changed from 4 layers to 6 layers so that both the RF part and the crystal oscillator part can obtain a more complete ground. The circuit was changed from lead-free to immersion gold process, which is more friendly to signal transmission. The position of some components was adjusted.  The RF path was optimized according to the six-layer board structure. The direction of the 2.4GHz Bluetooth antenna and IPEX LoRa antenna interface was changed to make them farther away. Now the high-frequency Mesh node T114 can stably send long data packets in the “Long_Fast” channel of Meshtastic. Main Features MCU nRF52840 (Bluetooth), LoRa chipset SX1262. 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. Low power consumption, 11 uA in deep sleep. Operation condition: -20 ~ 70℃, 90%RH(No condensing). Type-C USB interface with a complete voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures. Compatible with Arduino, we provide development frameworks and libraries. Various Interfaces: 1.25*2P LiPo connector, 1.25*2P Solar panel connector, 1.25*8P GNSS module connector, which greatly increase the extensibility of the board. Specifications 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 Description Pin Map High light Low Power Consumption Meshtastic enter low power consumption mode, the current is only 23uA. Entering LoRaWAN deep sleep mode, the current is only 11uA. Powerful communication capability supports LoRa and Bluetooth 5.0. optional 1.14 inch TFT display and GPS module as accessories. Plastic support plate A transparent plastic support platform is installed between the PCB and the monitor. Protect the electronic components of the circuit board and enhance its heat dissipation. Highly extensible integrate multiple power interfaces, 5V USB, lithium battery, solar panel. provid abundant pins and hardware resources. Dimension FAQ Can the onboard 2.4GHz antenna be replaced? The 2.4GHz antenna is a multilayer ceramic antenna for BlueTooth communications, it can’t 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 search “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 * 28mm, and the default 3.7V lithium battery size is 41 * 24mm How to enter meshtastic on the screenless version of mesh node 114? 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 time ago, customer reports that some of the Mesh Node T114 works as a Meshtastic device and tries to send long strings (>50 chars) ONLY in Long-Fast mode (SF11, 250K BW), sometimes sending messages may 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 has long chars sending issue? With our detailed and long time testing, there is NO issue with long packet transmission in versions 433MHz and 470MHz, so they are not included in the compensation list. But in response to users’ demand for the 433 and 470 hardware V2 versions, our engineers are debugging the corresponding hardware. It will be released soon. Docs & Resource [Docs] — User Manual [Resource] —Heltec nRF52 framework and Lib [Resource] —SnapEmu IoT Platform [Attachment] — V1.x Shematic diagram [Attachment] — V2.x Schematic diagram [Attachment] — Datasheet [Attachment] — TFT-LCD Datasheet [Resource] — Related Resources Project Ultrasonic Sensor Distance Measurement with LoRaWAN Packing list The default packing list without selecting any accessories is as follows: Item Quantity Mesh Node T114 x1 LoRa Antenna x1 SH1.25×2 Battery Connector x2 2.54 *13 Header Pin x2 L76K GNSS (Available when GPS selected) x1 Protect Shell and Transfer LoRa antenna (Available when Shell selected) x1