# 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. ## Quick Facts - **Brand:** Heltec Automation - **Board Type:** dev-board - **Price:** ~$17.9 - **Product Readiness:** consumer - **CPU:** Xtensa LX7 dual-core @ 240MHz, FPU, ULP co-processor - **CPU Architecture:** Xtensa LX7 - **CPU Cores:** 2 - **RAM:** 512KB SRAM - **PSRAM:** 8MB (OPI) - **Flash:** 16MB (QSPI) - **USB:** USB-C (native USB OTG) - **Power:** 5V via USB-C,3.3-4.2V LiPo - **Operating Voltage:** 3.3V - **Operating Temp:** -20°C to +70°C - **Dimensions:** 60 × 25.4 × 10.19mm - **Weight:** 35g - **Charging Port:** USB-C - **Antenna:** U.FL/IPEX (LoRa,WiFi) - **SD Card:** No - **Display:** 1.9" TFT-LCD 170×320 ## Connectivity - **Wifi:** 802.11 b/g/n - **Bluetooth:** BLE 5.0 - **Lora:** SX1262 433/868/915MHz ## Open Source - **Firmware:** Yes - **Schematics:** Yes - **PCB Layout:** No ## Compatible Firmware arduino, micropython, platformio, ESP-IDF, meshtastic ## Use Cases - meshtastic - lora-mesh-networking - lorawan-node - iot-sensor-node - portable-display - lora-telemetry ## Components - **ESP32-S3R8** (mcu): 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. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) - **SX1262** (radio): 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. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.semtech.com%2Fproducts%2Fwireless-rf%2Flora-connect%2Fsx1262&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) - **ST7789** (display-driver): 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. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.buydisplay.com%2Fdownload%2Fic%2FST7789.pdf&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) ## Protocols - **SPI** (SPI (Display)): SCK: GPIO38, MOSI: GPIO48, CS: GPIO39, DC: GPIO47, RST: GPIO40 - **SPI** (SPI (LoRa)): SCK: GPIO9, MOSI: GPIO10, MISO: GPIO11, NSS: GPIO8 - **I2C** (I2C (Sensor)): SDA: GPIO2, SCL: GPIO1 - **UART** (UART0): TX: GPIO43, RX: GPIO44 - **USB** (USB-C): D+: GPIO20, D-: GPIO19 ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO1 | I2C SCL (Sensor Port) | I2C | digital-input, digital-output, pwm | | GPIO2 | I2C SDA (Sensor Port) | I2C | digital-input, digital-output, pwm, adc, touch | | GPIO3 | ADC1_CH2 / Touch3 | | digital-input, digital-output, pwm, adc, touch | | GPIO4 | ADC1_CH3 / Touch4 | | digital-input, digital-output, pwm, adc, touch | | GPIO5 | ADC1_CH4 / Touch5 | | digital-input, digital-output, pwm, adc, touch | | GPIO6 | Battery ADC | ADC | digital-input, digital-output, pwm, adc, touch | | GPIO7 | TFT VCtrl (Display Power) | | digital-input, digital-output, pwm, adc, touch | | GPIO8 | LoRa NSS (SPI CS) | SPI | digital-input, digital-output, pwm, adc, touch | | GPIO9 | LoRa SCK | SPI | digital-input, digital-output, pwm, adc, touch | | GPIO10 | LoRa MOSI | SPI | digital-input, digital-output, pwm, adc, touch | | GPIO11 | LoRa MISO | SPI | digital-input, digital-output, pwm, adc | | GPIO12 | LoRa RST | | digital-input, digital-output, pwm, adc | | GPIO13 | LoRa BUSY | | digital-input, digital-output, pwm, adc, touch | | GPIO14 | LoRa DIO1 | | digital-input, digital-output, pwm, adc, touch | | GPIO15 | 32K_P (Crystal) | | digital-input, digital-output, pwm, adc | | GPIO16 | 32K_N (Crystal) | | digital-input, digital-output, pwm, adc | | GPIO17 | TFT Backlight Control | | digital-input, digital-output, pwm, adc | | GPIO18 | GPIO18 | | digital-input, digital-output, pwm | | GPIO19 | USB D- | USB | digital-input, digital-output | | GPIO20 | USB D+ | USB | digital-input, digital-output | | GPIO21 | User Button (BOOT1) | | digital-input, digital-output, pwm | | GPIO38 | TFT SCK (Display SPI) | SPI | digital-input, digital-output, pwm | | GPIO39 | TFT CS (Display SPI) | SPI | digital-input, digital-output, pwm | | GPIO40 | TFT RST (Display) | | digital-input, digital-output, pwm | | GPIO43 | UART TX (U0TXD) | UART | digital-input, digital-output, pwm | | GPIO44 | UART RX (U0RXD) | UART | digital-input, digital-output, pwm | | GPIO47 | TFT DC (Display) | SPI | digital-input, digital-output, pwm | | GPIO48 | TFT MOSI (Display SPI) | SPI | digital-input, digital-output, pwm | ## Available Software - **[Arduino IDE]()** (open-source) - **[PlatformIO]()** (open-source) - **[ESP-IDF]()** (open-source) - **[MicroPython]()** (open-source) ## Description ## 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. ## Where to Buy - [Heltec Official](https://openhardware.directory/r?to=https%3A%2F%2Fheltec.org%2Fproject%2Fvision-master-t190%2F&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) — $17.90 - [Amazon](https://openhardware.directory/r?to=https%3A%2F%2Fwww.amazon.com%2FHeltec-Meshtastic-Development-Compatible-902-928MHz%2Fdp%2FB0D818DT7R&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) — $19.99 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fheltec.org%2Fproject%2Fvision-master-t190%2F&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FHeltec-Aaron-Lee%2FWiFi_Kit_series&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fwiki.heltec.org%2Fdocs%2Fdevices%2Fopen-source-hardware%2Fesp32-series%2Fvision-master%2Fvison-master-t190%2F&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) - [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fresource.heltec.cn%2Fdownload%2FHT-VMT190%2FHT-VMT190%2520Datasheet.pdf&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) - [schematics](https://openhardware.directory/r?to=https%3A%2F%2Fresource.heltec.cn%2Fdownload%2FHT-VMT190%2FHT-VMT90%2520Schematic%2520Diagram.pdf&ref=openhardware.directory&product=heltec-vision-master-t190&source=md-export) ## Tags `esp32-s3`, `lora`, `meshtastic`, `tft-display`, `iot`, `lorawan`, `heltec` ## Images ![Heltec Vision Master T190](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-vision-master-t190/ddfaf2f8b9d0.png) ![Heltec Vision Master T190](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-vision-master-t190/521d65083a48.png) ![Heltec Vision Master T190](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-vision-master-t190/a0e05d81773f.png) ![Heltec Vision Master T190](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-vision-master-t190/52008d2cea47.png) ![Heltec Vision Master T190](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-vision-master-t190/36efdf563ea9.png) ![Heltec Vision Master T190](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-vision-master-t190/22145cc26f85.png) ![Heltec Vision Master T190](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-vision-master-t190/fb1d99697018.png) > **Battery Powered:** LiPo --- [View full device page](https://openhardware.directory/devices/heltec-vision-master-t190)