The TTGO T-Call ESP32 with SIM800L GPRS Module is an all-in-one IoT powerhouse that combines Wi-Fi, Bluetooth, and Cellular connectivity on a single board. At Electrapac, we recommend this module for developers and engineers in Bangladesh who are building remote monitoring systems, smart agriculture projects, or GPS trackers that need to stay connected where Wi-Fi isn't available.

Product Overview

This board features the powerful ESP32 dual-core processor integrated with the SIM800L GSM/GPRS module. It allows your project to send SMS, make voice calls, and connect to the internet via 2G mobile data. With its built-in LiPo battery charging circuit and USB-C interface, it is ready for portable, long-term deployments in the field.

Key Features for Electrapac Customers

• Triple Connectivity: Seamlessly switch between Wi-Fi, Bluetooth (Classic/BLE), and Cellular (GPRS) depending on signal availability.

• Compact IoT Design: No need for messy jumper wires between an ESP32 and a separate GSM module. This integrated PCB reduces noise and improves reliability.

• Battery Optimized: Includes an integrated IP5306 power management IC, allowing the board to run on a standard 3.7V Lithium battery and charge it automatically when USB power is connected.

• Ready for Bangladesh Networks: The quad-band SIM800L is fully compatible with local mobile operators (Grameenphone, Robi, Banglalink, Teletalk) for SMS and data.

• Rich Peripheral Support: Access all the standard ESP32 features, including capacitive touch sensors, Hall sensors, SD card interface, and high-speed SPI/I2C/UART.

Getting Started & Pro-Tips

Integrating the Electrapac TTGO T-Call is efficient, but requires attention to power management:

1. Antenna Connection: Always connect the included GPRS antenna before powering on the SIM800L to prevent damage to the module and ensure a stable signal.

2. Nano SIM Slot: Ensure you are using a Nano SIM card with an active 2G data plan or SMS balance.

3. Power Requirements: The SIM800L can draw up to 2A peaks during network transmission. If the board resets when trying to connect to the cellular network, ensure you are using a high-quality 5V/2A USB adapter or a healthy LiPo battery.

Pro-Tip: In the Arduino IDE, use the "ESP32 Dev Module" board setting. You will need to pull GPIO 4 (Power Enable) to HIGH in your code to turn on the SIM800L module.

Primary Applications

• Remote Weather Stations: Sending sensor data (Temperature/Humidity) to a web server via GPRS.

• Smart Agriculture: Using SMS to remotely trigger irrigation pumps or check soil moisture in rural areas.

• Security & Anti-Theft: Building GPS trackers for vehicles that alert you via SMS if they move outside a set zone.

• Industrial Monitoring: Real-time data logging for remote machinery where Wi-Fi is unavailable.

• SMS Gateways: Automating customer notifications or alerts for small business systems.

Why Shop at Electrapac?

We source the TTGO T-Call V1.4 (or latest version) with the high-speed USB-C interface to ensure our customers in Bangladesh have the most stable platform for their cellular IoT projects. Visit us at for the advanced modules that take your projects beyond the range of Wi-Fi.