Technical summary
The TTGO T-Call V1.4 board is a powerful wireless IoT development board that combines the ESP32 microcontroller with an integrated 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 compared to previous models.
Designed for advanced Internet of Things (IoT) development, the T-Call V1.4 supports Wi-Fi, Bluetooth and GSM/GPRS communications, making it ideal for smart agriculture, GPS tracking, SMS control systems, remote sensors and much more. It also includes a SIM card slot and an antenna interface for easy integration into cellular networks.
Technical specifications
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Main chip: ESP32 (32-bit dual-core microcontroller + WiFi + Bluetooth)
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Cellular module: SIM800 GSM/GPRS (quad-band 850/900/1800/1900 MHz)
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USB interface: CH9102F USB-to-serial chip
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SIM card slot: Micro SIM (2G only)
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Power supply: 5V via USB Type-C or external battery
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Operating voltage: 3.3V (ESP32 logic level)
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GPIO pins: Several available for I2C, SPI, UART, ADC and PWM
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Antenna interface: U.FL connector for external GSM antenna
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Flash memory: 4 Mo
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Battery connector: 2-pin JST for Li-Ion/Li-Po battery
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Dimensions: about 50mm x 28mm
Package includes
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1 x TTGO T-Call V1.4 ESP32 development board with SIM800H
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1 x GSM antenna
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1 x JST battery connector (pre-soldered)
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1 x Micro SIM card slot (pre-installed)
Applications
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IoT and M2M communication systems
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SMS automation or alert systems
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Vehicle or asset tracking by GPS and GSM
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Smart agriculture and irrigation systems
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Remote environmental monitoring
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Wi-Fi-GSM backup communication modules
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Home automation with cellular backup
