The T-Call ESP32 Dev Board V1.4 is a versatile IoT development board combining the powerful ESP32 microcontroller with an integrated SIM800L GSM/GPRS module. It provides Wi-Fi, Bluetooth, and cellular connectivity in a single compact board, making it suitable for projects that require remote communication, SMS, voice, or GPRS data connectivity.

Based on the ESP32 platform, the board provides multiple GPIO interfaces and can be programmed using the Arduino IDE and other ESP32-compatible development environments. The integrated SIM800L module enables cellular communication without requiring a separate GSM development board, making the T-Call an excellent choice for IoT, remote monitoring, automation, GPS/GSM projects, and SMS-controlled systems.

Features

• ESP32-based development platform
• Integrated SIM800L GSM/GPRS module
• Supports 2G GSM cellular communication
• Built-in Wi-Fi and Bluetooth connectivity
• Supports SMS messaging and voice communication
• GPRS connectivity for IoT data transmission
• Multiple GPIO pins for sensors and peripherals
• Supports UART, I2C, SPI and other ESP32 interfaces
• Programmable using Arduino IDE
• USB interface for programming and serial communication
• SIM card interface for cellular network connectivity
• Compact board combining MCU and GSM functionality

Specifications

• Product Type: ESP32 GSM/GPRS Development Board
• Model: T-Call ESP32 V1.4
• MCU: ESP32
• Cellular Module: SIM800L
• Cellular Network: 2G GSM/GPRS
• GSM Frequency Bands: Quad-band GSM 850 / 900 / 1800 / 1900 MHz
• Wireless Connectivity: 2.4 GHz Wi-Fi 802.11 b/g/n
• Bluetooth: Bluetooth 4.2 / BLE
• SIM Interface: Nano SIM card slot
• USB Interface: Micro USB
• Programming: Arduino IDE / ESP32-compatible development environments
• Logic Voltage: 3.3V
• GSM Supply: Dedicated power circuitry for SIM800L
• Antenna: External GSM antenna connection
• Interfaces: UART, GPIO, I2C, SPI and ADC
• Board Version: V1.4
• Brand: TTGO / LILYGO

Applications

• IoT and remote monitoring systems
• GSM-based automation and control
• SMS-controlled devices
• Remote sensor monitoring
• GPRS data communication
• Smart agriculture and environmental monitoring
• Security and alarm systems
• GPS/GSM tracking projects
• Industrial automation
• ESP32-based wireless projects
• Remote data logging systems 

NOTE: T-Call SIM800 Series

**The schematics of the module will change with different batches please refer the above link for more details.**