Heltec Vision Master T190
ESP32-S3 development board with optional SX1262 LoRa module and 1.9-inch TFT color display. Supports Meshtastic, LoRaWAN, Arduino, MicroPython, and features integrated battery management with 18uA deep sleep.
$17.90
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Specifications
Components
Xtensa LX7 dual-core @ 240MHz with 512KB SRAM, 8MB OPI PSRAM, WiFi 802.11 b/g/n, BLE 5.0, USB OTG, and ULP RISC-V co-processor for deep sleep operation at 18uA.
Semtech SX1262 long-range LoRa transceiver supporting 150-960MHz ISM bands with +21dBm TX power and -136dBm RX sensitivity at SF12/BW125. Supports LoRa, LoRaWAN, and FSK modulation.
Sitronix ST7789 TFT controller driving a 1.9-inch 170x320 pixel display with 262K colors via SPI interface. Supports partial display mode for power savings.
Bus Interfaces
GPIO Map
Overview
The Heltec Vision Master T190 (HT-VMT190) is a compact development board built around the ESP32-S3R8 system-on-chip, featuring an optional SX1262 LoRa transceiver and a vibrant 1.9-inch TFT-LCD color display capable of rendering 262,000 colors at 170x320 pixel resolution. The board's modular LoRa approach lets developers choose whether to include long-range radio capabilities, reducing costs for WiFi/BLE-only applications.
Designed for low-power IoT deployments, the T190 achieves an impressive 18uA deep sleep current with integrated lithium battery management including charge/discharge control and overcharge protection. The dual SH1.25-2P battery connectors and USB-C port provide flexible power options for both portable and tethered installations. A dedicated SH1.0-4P sensor interface enables plug-and-play connectivity with Heltec's QuickLink sensor ecosystem.
The board has strong community adoption as a Meshtastic node, offering a color display advantage over e-paper alternatives for real-time mesh network monitoring. It also supports LoRaWAN, NerdMiner (Bitcoin lottery mining), and general-purpose IoT applications. With dual U.FL/IPEX antenna connectors for both LoRa and WiFi, an exposed I2C sensor port, and full Arduino/MicroPython/PlatformIO/ESP-IDF support, the T190 serves as a versatile platform for connected projects requiring a visual interface.
Use Cases
6Meshtastic
Running Meshtastic firmware for off-grid LoRa mesh text communication, location sharing, and sensor telemetry without internet or cellular infrastructure.
LoRa Mesh Networking
Building off-grid mesh communication networks using LoRa radio for text messaging, location sharing, and sensor data relay without cellular or internet infrastructure.
LoRaWAN Node
A LoRaWAN end device that transmits sensor data to a LoRaWAN gateway for long-range, low-power IoT applications.
IoT Sensor Node
Compact wireless sensor node for collecting and transmitting environmental or industrial data.
Portable Display
Battery-powered portable display for showing sensor data, maps, or user interfaces on the go.
LoRa Telemetry
Telemetry data transmission using LoRa radio for remote sensor monitoring.
Resources
Where to Buy
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