TTGO T-Call ESP32 Development Board – SIM800L GSM/GPRS Module

The TTGO T-Call ESP32 is an advanced IoT development platform that combines the powerful ESP32 with the integrated SIM800L for cellular communication. Designed for remote and off-grid IoT applications, it enables GSM/GPRS connectivity for data transmission, SMS messaging, and voice calls, while still supporting Wi-Fi and Bluetooth communication. The board includes onboard battery charging, voltage regulation, SIM card support, and access to multiple GPIO, ADC, DAC, PWM, UART, SPI, and I²C interfaces. It is ideal for IoT systems that require internet access in locations without Wi-Fi coverage.

• ESP32 dual-core processor with Wi-Fi and Bluetooth
• Integrated SIM800L GSM/GPRS module
• Supports SMS, voice calls, and cellular data
• Quad-band GSM support (850/900/1800/1900 MHz)
• Micro USB interface for programming and power
• Onboard battery charging and power management
• SIM card slot for mobile network access
• External antenna connector for improved signal reception
• Multiple GPIO pins for peripheral integration
• ADC, DAC, and PWM support
• Supports UART, SPI, and I²C communication
• Compatible with Arduino IDE and Espressif SDK
• Boot and reset buttons onboard
• Suitable for remote IoT applications

• Product Type: Cellular IoT Development Board
• Model: TTGO T-Call ESP32
• Core Processor: Dual-core 32-bit Tensilica LX6 MCU
• Wireless Module: ESP32
• Wi-Fi Standard: IEEE 802.11 b/g/n
• Bluetooth Support: Bluetooth Classic + BLE
• Cellular Module: SIM800L
• Cellular Bands: GSM 850 / 900 / 1800 / 1900 MHz
• Operating Voltage: 3.3V DC
• Input Voltage: 5V via Micro USB
• SIM Card Slot: Micro SIM
• GPIO Support: Multiple Digital I/O
• Analog Features: ADC, DAC, PWM
• Communication Interfaces: UART, SPI, I²C, Wi-Fi, Bluetooth, GSM, GPRS
• Power Management: Onboard Battery Charging Circuit
• USB Interface: Micro USB
• Operating Temperature: -20°C to +70°C
• Dimensions: Approximately 70 × 40 mm
• Application: Cellular IoT and Remote Monitoring

• 3D Model
• Official TTGO T-Call ESP32 SIM800L GitHub Repository

• Publish Data to Cloud without Wi-Fi (TTGO T-Call ESP32 SIM800L)

• TTGO T-CALL : The Best IoT Board with multiple connectivity options | ESP32 Sim800L