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TTGO TCall & SIM800C-DS V02 ESP32 WIFI Bluetooth Nano Card Slot SIM800C Development Board
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SKU: TES-EV00006035
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TTGO TCall & SIM800C-DS V02 ESP32 WIFI Bluetooth Nano Card Slot SIM800C Development Board
The TTGO TCall & SIM800C-DS V02 is an integrated IoT development board combining ESP32 microcontroller with SIM800C GSM module, enabling simultaneous WIFI, Bluetooth, and cellular connectivity in a compact form factor. Professional embedded systems engineers and IoT developers use this board to build remote monitoring systems, GPS tracking devices, and cellular-enabled smart devices that require dual connectivity without external components. This board solves the critical challenge of integrating multiple wireless protocols while maintaining minimal PCB footprint and power efficiency for battery-operated applications.
Product Overview
The TTGO TCall & SIM800C-DS V02 combines the powerful ESP32 dual-core processor with the SIM800C GSM/GPRS module on a single development board, eliminating the need for external breakout boards or complex wiring. The ESP32 operates at 240MHz with 520KB SRAM and integrated 802.11b/g/n WIFI plus Bluetooth 4.2 LE, while the SIM800C module provides quad-band GSM connectivity (850/900/1800/1900MHz) with integrated TCP/IP stack. The nano card slot accepts standard SIM cards, allowing direct cellular network access for voice calls, SMS, and GPRS data transmission. This integration is achieved through UART serial communication between the ESP32 and SIM800C, with dedicated GPIO pins for power management and hardware reset control.
The V02 revision improves upon earlier versions with optimized power distribution circuitry, enhanced antenna design for better cellular signal reception, and improved thermal management for sustained operation. The board includes onboard lithium battery charging circuit with USB Type-C connector, making it ideal for portable applications. Built-in voltage regulation supports 5V USB input or 3.7-4.2V lithium battery operation, with separate power domains for ESP32 and SIM800C to prevent voltage conflicts. The compact 54x54mm form factor and 0.1-inch header pins enable rapid prototyping while maintaining professional-grade component selection and PCB layout.
Key Specifications
| Specification | Details |
| Product Type | ESP32 GSM Development Board with SIM800C Module |
| Brand | TTGO (LilyGO) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Microcontroller | ESP32 Dual-Core 240MHz with 520KB SRAM |
| WIFI Connectivity | 802.11b/g/n 2.4GHz with integrated antenna |
| Bluetooth | Bluetooth 4.2 LE with integrated antenna |
| Cellular Module | SIM800C Quad-Band GSM/GPRS (850/900/1800/1900MHz) |
| SIM Card Slot | Nano SIM card compatible |
| Power Input | USB Type-C 5V or 3.7-4.2V Lithium Battery |
| Battery Charging | Integrated TP4056 lithium charging circuit |
| GPIO Pins | 30 I/O pins with 12-bit ADC and SPI/I2C/UART support |
| Board Dimensions | 54 x 54 x 12mm |
| Operating Temperature | -40 to 85 degrees Celsius |
Key Features
- Dual wireless connectivity with ESP32 WIFI and Bluetooth 4.2 LE enabling simultaneous cloud connection and local device communication without additional modules
- Integrated SIM800C GSM module with quad-band support providing cellular connectivity independent of WIFI availability for reliable remote communication
- Onboard lithium battery charging circuit with USB Type-C connector allowing portable deployment without external power management circuits
- Nano SIM card slot supporting standard SIM cards for direct cellular network access with voice, SMS, and GPRS data capabilities
- Optimized power distribution with separate voltage regulators for ESP32 and SIM800C preventing voltage conflicts during high-current GSM transmission
- 30 GPIO pins with 12-bit ADC, SPI, I2C, and UART interfaces enabling integration of sensors, displays, and external peripherals
- Compact 54x54mm form factor with 0.1-inch header pins supporting breadboard prototyping and custom PCB integration
Applications and Use Cases
- Remote GPS tracking devices for fleet management and vehicle location monitoring using cellular GPRS data transmission with WIFI fallback for stationary updates
- IoT environmental monitoring stations measuring temperature, humidity, and air quality with dual transmission capability via WIFI to local gateway or cellular to cloud servers
- Smart home automation hubs combining WIFI connectivity for local device control with cellular backup ensuring system operation during internet outages
- Portable medical alert systems and personal emergency response devices utilizing cellular voice and SMS capabilities with WIFI for data logging and cloud synchronization
- Industrial equipment monitoring and predictive maintenance systems transmitting sensor data via GSM to remote servers with WIFI connectivity for local diagnostics
- Agricultural IoT applications for soil moisture and weather monitoring in remote areas where cellular is the only available connectivity option
How to Use
Begin by installing the Arduino IDE and adding the ESP32 board package via the Boards Manager. Insert a nano SIM card with active cellular plan into the SIM card slot, ensuring proper seating until you hear the click. Connect the board to your computer via USB Type-C cable and upload the example sketches from the TTGO GitHub repository. Configure the SIM800C module using AT commands through the UART interface (typically GPIO16 RX and GPIO17 TX) to establish GSM connectivity. Use the Serial Monitor to verify module initialization with commands like AT and AT+CPIN? to check SIM card status.
For WIFI connectivity, use the standard ESP32 WiFi library to scan and connect to available networks. For cellular operations, implement the TinyGSM library which provides a unified interface for GSM modules, simplifying GPRS data transmission and SMS handling. Configure power management by enabling the onboard voltage regulators and setting appropriate GPIO pins for SIM800C power control. If using battery power, monitor the battery voltage through the ADC pin and implement low-power sleep modes during idle periods. Test both WIFI and cellular connectivity separately before implementing dual-mode operation to ensure proper module initialization and network registration.
Frequently Asked Questions
What is the difference between SIM800C and SIM800L modules on this board?
The SIM800C module used in this V02 board provides improved power efficiency and better antenna design compared to the older SIM800L. The SIM800C has optimized current consumption during idle states, making it more suitable for battery-powered applications. Both support the same AT command set, but SIM800C offers superior performance in weak signal areas due to its enhanced RF frontend.
Can I use this board with 2G cellular networks only?
Yes, the SIM800C module is a 2G GSM/GPRS module and does not support 3G or 4G LTE networks. However, most cellular providers maintain 2G networks alongside newer technologies for backward compatibility. Verify with your service provider that they still support 2G GSM in your region. If 4G capability is required, consider TTGO boards with SIM7600 or SIM7000 modules instead.
How do I switch between WIFI and cellular connectivity programmatically?
Use the TinyGSM library to manage both connections independently. Keep the WIFI connection active while initializing the GSM modem on separate UART pins. Implement logic to check WIFI signal strength and automatically failover to cellular GPRS when WIFI signal drops below threshold. You can transmit data via whichever connection is available or use WIFI as primary with cellular as backup for redundancy.
What is the maximum current draw during GSM transmission?
The SIM800C module can draw peak currents of 2A during GSM transmission bursts. Ensure your power supply can handle this current without voltage sag. If using battery power, a battery with minimum 2000mAh capacity is recommended to prevent brownout conditions. The onboard TP4056 charging circuit supports charging currents up to 1A for typical lithium cells.
Can I use this board with Arduino IDE directly?
Yes, the TTGO TCall board is fully compatible with Arduino IDE. Install the ESP32 board package from the Boards Manager and select TTGO T-Call or a generic ESP32 board profile. All standard Arduino libraries work with the ESP32 core. For GSM operations, install the TinyGSM library which provides Arduino-compatible functions for AT command management.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy TTGO TCall & SIM800C-DS V02 ESP32 WIFI Bluetooth Nano Card Slot SIM800C Development Board Online in India
Purchase the TTGO TCall & SIM800C
TTGO TCall & SIM800C-DS V02 ESP32 WIFI Bluetooth Nano Card Slot SIM800C Development Board
The TTGO TCall & SIM800C-DS V02 is an integrated IoT development board combining ESP32 microcontroller with SIM800C GSM module, enabling simultaneous WIFI, Bluetooth, and cellular connectivity in a compact form factor. Professional embedded systems engineers and IoT developers use this board to build remote monitoring systems, GPS tracking devices, and cellular-enabled smart devices that require dual connectivity without external components. This board solves the critical challenge of integrating multiple wireless protocols while maintaining minimal PCB footprint and power efficiency for battery-operated applications.
Product Overview
The TTGO TCall & SIM800C-DS V02 combines the powerful ESP32 dual-core processor with the SIM800C GSM/GPRS module on a single development board, eliminating the need for external breakout boards or complex wiring. The ESP32 operates at 240MHz with 520KB SRAM and integrated 802.11b/g/n WIFI plus Bluetooth 4.2 LE, while the SIM800C module provides quad-band GSM connectivity (850/900/1800/1900MHz) with integrated TCP/IP stack. The nano card slot accepts standard SIM cards, allowing direct cellular network access for voice calls, SMS, and GPRS data transmission. This integration is achieved through UART serial communication between the ESP32 and SIM800C, with dedicated GPIO pins for power management and hardware reset control.
The V02 revision improves upon earlier versions with optimized power distribution circuitry, enhanced antenna design for better cellular signal reception, and improved thermal management for sustained operation. The board includes onboard lithium battery charging circuit with USB Type-C connector, making it ideal for portable applications. Built-in voltage regulation supports 5V USB input or 3.7-4.2V lithium battery operation, with separate power domains for ESP32 and SIM800C to prevent voltage conflicts. The compact 54x54mm form factor and 0.1-inch header pins enable rapid prototyping while maintaining professional-grade component selection and PCB layout.
Key Specifications
| Specification | Details |
| Product Type | ESP32 GSM Development Board with SIM800C Module |
| Brand | TTGO (LilyGO) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Microcontroller | ESP32 Dual-Core 240MHz with 520KB SRAM |
| WIFI Connectivity | 802.11b/g/n 2.4GHz with integrated antenna |
| Bluetooth | Bluetooth 4.2 LE with integrated antenna |
| Cellular Module | SIM800C Quad-Band GSM/GPRS (850/900/1800/1900MHz) |
| SIM Card Slot | Nano SIM card compatible |
| Power Input | USB Type-C 5V or 3.7-4.2V Lithium Battery |
| Battery Charging | Integrated TP4056 lithium charging circuit |
| GPIO Pins | 30 I/O pins with 12-bit ADC and SPI/I2C/UART support |
| Board Dimensions | 54 x 54 x 12mm |
| Operating Temperature | -40 to 85 degrees Celsius |
Key Features
- Dual wireless connectivity with ESP32 WIFI and Bluetooth 4.2 LE enabling simultaneous cloud connection and local device communication without additional modules
- Integrated SIM800C GSM module with quad-band support providing cellular connectivity independent of WIFI availability for reliable remote communication
- Onboard lithium battery charging circuit with USB Type-C connector allowing portable deployment without external power management circuits
- Nano SIM card slot supporting standard SIM cards for direct cellular network access with voice, SMS, and GPRS data capabilities
- Optimized power distribution with separate voltage regulators for ESP32 and SIM800C preventing voltage conflicts during high-current GSM transmission
- 30 GPIO pins with 12-bit ADC, SPI, I2C, and UART interfaces enabling integration of sensors, displays, and external peripherals
- Compact 54x54mm form factor with 0.1-inch header pins supporting breadboard prototyping and custom PCB integration
Applications and Use Cases
- Remote GPS tracking devices for fleet management and vehicle location monitoring using cellular GPRS data transmission with WIFI fallback for stationary updates
- IoT environmental monitoring stations measuring temperature, humidity, and air quality with dual transmission capability via WIFI to local gateway or cellular to cloud servers
- Smart home automation hubs combining WIFI connectivity for local device control with cellular backup ensuring system operation during internet outages
- Portable medical alert systems and personal emergency response devices utilizing cellular voice and SMS capabilities with WIFI for data logging and cloud synchronization
- Industrial equipment monitoring and predictive maintenance systems transmitting sensor data via GSM to remote servers with WIFI connectivity for local diagnostics
- Agricultural IoT applications for soil moisture and weather monitoring in remote areas where cellular is the only available connectivity option
How to Use
Begin by installing the Arduino IDE and adding the ESP32 board package via the Boards Manager. Insert a nano SIM card with active cellular plan into the SIM card slot, ensuring proper seating until you hear the click. Connect the board to your computer via USB Type-C cable and upload the example sketches from the TTGO GitHub repository. Configure the SIM800C module using AT commands through the UART interface (typically GPIO16 RX and GPIO17 TX) to establish GSM connectivity. Use the Serial Monitor to verify module initialization with commands like AT and AT+CPIN? to check SIM card status.
For WIFI connectivity, use the standard ESP32 WiFi library to scan and connect to available networks. For cellular operations, implement the TinyGSM library which provides a unified interface for GSM modules, simplifying GPRS data transmission and SMS handling. Configure power management by enabling the onboard voltage regulators and setting appropriate GPIO pins for SIM800C power control. If using battery power, monitor the battery voltage through the ADC pin and implement low-power sleep modes during idle periods. Test both WIFI and cellular connectivity separately before implementing dual-mode operation to ensure proper module initialization and network registration.
Frequently Asked Questions
What is the difference between SIM800C and SIM800L modules on this board?
The SIM800C module used in this V02 board provides improved power efficiency and better antenna design compared to the older SIM800L. The SIM800C has optimized current consumption during idle states, making it more suitable for battery-powered applications. Both support the same AT command set, but SIM800C offers superior performance in weak signal areas due to its enhanced RF frontend.
Can I use this board with 2G cellular networks only?
Yes, the SIM800C module is a 2G GSM/GPRS module and does not support 3G or 4G LTE networks. However, most cellular providers maintain 2G networks alongside newer technologies for backward compatibility. Verify with your service provider that they still support 2G GSM in your region. If 4G capability is required, consider TTGO boards with SIM7600 or SIM7000 modules instead.
How do I switch between WIFI and cellular connectivity programmatically?
Use the TinyGSM library to manage both connections independently. Keep the WIFI connection active while initializing the GSM modem on separate UART pins. Implement logic to check WIFI signal strength and automatically failover to cellular GPRS when WIFI signal drops below threshold. You can transmit data via whichever connection is available or use WIFI as primary with cellular as backup for redundancy.
What is the maximum current draw during GSM transmission?
The SIM800C module can draw peak currents of 2A during GSM transmission bursts. Ensure your power supply can handle this current without voltage sag. If using battery power, a battery with minimum 2000mAh capacity is recommended to prevent brownout conditions. The onboard TP4056 charging circuit supports charging currents up to 1A for typical lithium cells.
Can I use this board with Arduino IDE directly?
Yes, the TTGO TCall board is fully compatible with Arduino IDE. Install the ESP32 board package from the Boards Manager and select TTGO T-Call or a generic ESP32 board profile. All standard Arduino libraries work with the ESP32 core. For GSM operations, install the TinyGSM library which provides Arduino-compatible functions for AT command management.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Engineer Store
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy TTGO TCall & SIM800C-DS V02 ESP32 WIFI Bluetooth Nano Card Slot SIM800C Development Board Online in India
Purchase the TTGO TCall & SIM800C