TTGO T-Call V1.4 ESP32 Wireless Development Board with SIM800H GSM/GPRS Module – CH9102F USB Chip

The TTGO T-Call V1.4 is a powerful wireless IoT development board that combines the popular ESP32 microcontroller with a built-in SIM800H GSM/GPRS module, enabling cellular connectivity for remote IoT applications. This version features the CH9102F USB-to-Serial chip, offering improved stability and compatibility over previous models.

Designed for advanced IoT development, the T-Call V1.4 supports WiFi, Bluetooth, and GSM/GPRS communication, making it ideal for smart agriculture, GPS tracking, SMS control systems, remote sensors, and more. It also includes a SIM card slot and antenna interface for easy integration into cellular networks.

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Technical Specifications

• Main Chipset: ESP32 (Dual-core 32-bit MCU + WiFi + Bluetooth)

• Cellular Module: SIM800H GSM/GPRS (Quad-Band 850/900/1800/1900 MHz)

• USB Interface: CH9102F USB-to-Serial Chip

• SIM Card Slot: Micro SIM (2G support only)

• Power Supply: 5V via USB Type-C or external battery

• Operating Voltage: 3.3V (ESP32 logic level)

• GPIO Pins: Multiple available for I2C, SPI, UART, ADC, PWM

• Antenna Interface: U.FL connector for external GSM antenna

• Flash Memory: 4MB

• Battery Connector: JST 2-pin for Li-Ion/Li-Po battery

• Dimensions: Approx. 50mm × 28mm

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Package Includes

• 1 × TTGO T-Call V1.4 ESP32 Development Board with SIM800H

• 1 × GSM Antenna

• 1 × JST Battery Connector (pre-soldered)

• 1 × Micro SIM card slot (pre-installed)

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Applications

• IoT and M2M communication systems

• SMS-based automation or alert systems

• GPS and GSM-based vehicle or asset tracking

• Smart agriculture and irrigation systems

• Remote environmental monitoring

• WiFi-GSM fallback communication modules

• Home automation with cellular backup