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TTGO TCall&,PMU ESP32 Wireless Module SIM Antenna SIM Card SIM800L Module Unsoldered
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SKU: TES-EV00006041
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TTGO TCall PMU ESP32 Wireless Module SIM Antenna SIM Card SIM800L Module Unsoldered
The TTGO TCall PMU is an integrated ESP32 microcontroller development board featuring the SIM800L GSM module, enabling 2G cellular connectivity with voice, SMS, and data capabilities. IoT developers, embedded systems engineers, and hardware prototypers use this module to build remote monitoring systems, GPS tracking devices, and IoT applications requiring cellular communication without WiFi infrastructure. This unsoldered variant solves the problem of integrating cellular connectivity into battery-powered IoT projects while maintaining compact form factor and low power consumption through integrated power management.
Product Overview
The TTGO TCall PMU combines the powerful ESP32 dual-core processor running at 240MHz with the industry-standard SIM800L GSM module, creating a complete cellular IoT solution on a single PCB. The module operates on 3.7V to 4.2V lithium battery input with integrated charging circuit and power management unit, allowing direct connection of Li-Po batteries. The SIM800L provides quad-band GSM/GPRS connectivity (850/900/1800/1900MHz) suitable for global deployment, while the ESP32 handles application logic, sensor interfacing, and data processing. The unsoldered configuration allows developers to customize pin headers, antenna connections, and component placement according to specific project requirements.
This board integrates a 32.768kHz RTC crystal for accurate timekeeping, micro-USB charging port, and dedicated antenna connector for the SIM800L module. The ESP32 includes 520KB SRAM, 4MB flash memory, and comprehensive peripheral support including SPI, I2C, UART, ADC, PWM, and capacitive touch sensing. The power management circuit intelligently switches between USB power and battery, with automatic charging when USB is connected. The unsoldered design provides flexibility for advanced users to implement custom power distribution, add additional sensors, or optimize PCB layout for production-grade applications.
Key Specifications
| Specification | Details |
| Product Type | ESP32 Microcontroller with SIM800L GSM Module |
| Brand | TTGO |
| 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 |
| Main Processor | ESP32 Dual-Core 240MHz Xtensa |
| Cellular Module | SIM800L Quad-Band GSM/GPRS |
| Operating Voltage | 3.7V to 4.2V (Li-Po Battery) |
| Flash Memory | 4MB |
| RAM | 520KB SRAM |
| Connectivity | GSM 850/900/1800/1900MHz, GPRS Class 12 |
| Charging Circuit | Integrated Li-Po Charger with USB Input |
| SIM Card Slot | Micro-SIM Compatible |
| Antenna | External SMA Connector for SIM800L |
| Board Dimensions | Approximately 55mm x 35mm x 10mm |
Key Features
- Integrated Power Management Unit with automatic USB/battery switching and Li-Po charging circuit for seamless portable operation
- Dual-core ESP32 processor with 240MHz clock speed and 520KB RAM enabling complex IoT applications and real-time data processing
- SIM800L GSM module supporting voice calls, SMS messaging, and GPRS data connectivity across 850/900/1800/1900MHz bands globally
- Unsoldered configuration allowing custom header placement, antenna routing, and component-level customization for production designs
- 4MB flash memory with OTA firmware update capability via cellular connection for remote device management
- Built-in 32.768kHz RTC crystal for accurate timestamp logging and scheduled task execution
- Comprehensive GPIO support including SPI, I2C, UART, ADC channels, and PWM outputs for sensor integration
- Micro-USB charging port with integrated protection circuits and battery level monitoring
Applications and Use Cases
- Remote GPS tracking devices for vehicles and assets using cellular GPRS data transmission with real-time location updates
- Industrial IoT monitoring systems for remote machinery, environmental sensors, and equipment diagnostics with cellular alarm notifications
- Smart agriculture applications monitoring soil moisture, temperature, and humidity with automated SMS alerts to farmers
- Emergency alert systems and panic buttons for security applications requiring cellular connectivity independent of WiFi infrastructure
- Battery-powered environmental monitoring stations collecting air quality, weather, and pollution data with periodic cellular data upload
- Prototype development for cellular IoT products with integrated power management and carrier-grade GSM connectivity
- Smart metering and utility monitoring solutions for remote meter reading and consumption tracking via GPRS
- Wearable health monitoring devices transmitting vital signs and health alerts through cellular network
How to Use
Begin by soldering appropriate pin headers to the unsoldered pads according to your project requirements. Insert a micro-SIM card with active 2G GSM service into the SIM card slot, ensuring proper orientation. Connect the external antenna to the SMA connector on the SIM800L module for optimal cellular signal reception. Attach a 3.7V to 4.2V lithium polymer battery to the battery connector, or use the micro-USB port for direct power and charging. Connect your development computer via USB to program the ESP32 using the Arduino IDE or ESP-IDF framework with appropriate SIM800L AT command libraries.
Configure the serial communication between ESP32 and SIM800L module using UART pins (typically GPIO16 for RX and GPIO17 for TX). Initialize the SIM800L with AT commands to register on the network, establish GPRS connection, and configure SMS or voice functionality as needed. Implement power management strategies using the integrated PMU to optimize battery life, such as enabling light sleep modes during idle periods and scheduling cellular transmissions. Test signal strength using AT+CSQ command and monitor battery voltage through ADC pins to implement low-battery warnings and graceful shutdown procedures.
Frequently Asked Questions
What is the difference between soldered and unsoldered versions of TTGO TCall PMU?
The unsoldered version comes without pin headers, antenna connectors, and battery connectors pre-soldered to the PCB. This allows developers to customize header placement, choose specific connector types, and optimize component positioning for their specific application. The soldered version comes fully assembled and ready to use immediately. Choose unsoldered for custom designs and production optimization, soldered for rapid prototyping.
Can this module work without a battery, using only USB power?
Yes, the integrated power management circuit allows operation directly from USB power without a battery connected. However, the module is optimized for battery operation, and the PMU intelligently manages power distribution between USB and battery sources. For always-on applications, USB power is suitable, but battery backup is recommended for IoT applications requiring continuous operation during power outages.
What type of SIM card does this module require?
The TTGO TCall PMU uses a micro-SIM card slot (15mm x 12mm), which is the standard SIM format for most 2G and 3G devices. Ensure your SIM card is activated with an active 2G GSM plan from your carrier. Some carriers may require enabling 2G access in their network settings as they phase out 2G services. Nano-SIM cards can be used with a micro-SIM adapter.
What is the typical battery life with this module?
Battery life depends heavily on usage patterns. In idle mode with periodic data transmission every 30 minutes, expect 7-10 days from a 2000mAh Li-Po battery. Continuous voice calls drain the battery in 3-5 hours. Light sleep modes can extend battery life to several weeks for applications transmitting data only once daily. Implement aggressive power management and disable unnecessary peripherals to maximize battery duration.
Does this module support WiFi connectivity in addition to cellular?
Yes, the ESP32 processor includes integrated WiFi (802.11 b/g/n) and Bluetooth 4.2 capabilities. The SIM800L provides cellular GSM/GPRS connectivity. You can use WiFi for local connectivity and programming, while the SIM800L handles cellular communication. This dual connectivity allows fallback mechanisms where the device uses WiFi when available and switches to cellular when WiFi is unavailable.
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 PMU ESP32 Wireless Module SIM Antenna SIM Card SIM800L Module Unsoldered Online in India
Purchase the TTGO TCall PMU ESP32 Wireless Module SIM Antenna SIM Card SIM800L Module Unsoldered online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on TTGO TCall PMU ESP32 Wireless Module with
TTGO TCall PMU ESP32 Wireless Module SIM Antenna SIM Card SIM800L Module Unsoldered
The TTGO TCall PMU is an integrated ESP32 microcontroller development board featuring the SIM800L GSM module, enabling 2G cellular connectivity with voice, SMS, and data capabilities. IoT developers, embedded systems engineers, and hardware prototypers use this module to build remote monitoring systems, GPS tracking devices, and IoT applications requiring cellular communication without WiFi infrastructure. This unsoldered variant solves the problem of integrating cellular connectivity into battery-powered IoT projects while maintaining compact form factor and low power consumption through integrated power management.
Product Overview
The TTGO TCall PMU combines the powerful ESP32 dual-core processor running at 240MHz with the industry-standard SIM800L GSM module, creating a complete cellular IoT solution on a single PCB. The module operates on 3.7V to 4.2V lithium battery input with integrated charging circuit and power management unit, allowing direct connection of Li-Po batteries. The SIM800L provides quad-band GSM/GPRS connectivity (850/900/1800/1900MHz) suitable for global deployment, while the ESP32 handles application logic, sensor interfacing, and data processing. The unsoldered configuration allows developers to customize pin headers, antenna connections, and component placement according to specific project requirements.
This board integrates a 32.768kHz RTC crystal for accurate timekeeping, micro-USB charging port, and dedicated antenna connector for the SIM800L module. The ESP32 includes 520KB SRAM, 4MB flash memory, and comprehensive peripheral support including SPI, I2C, UART, ADC, PWM, and capacitive touch sensing. The power management circuit intelligently switches between USB power and battery, with automatic charging when USB is connected. The unsoldered design provides flexibility for advanced users to implement custom power distribution, add additional sensors, or optimize PCB layout for production-grade applications.
Key Specifications
| Specification | Details |
| Product Type | ESP32 Microcontroller with SIM800L GSM Module |
| Brand | TTGO |
| 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 |
| Main Processor | ESP32 Dual-Core 240MHz Xtensa |
| Cellular Module | SIM800L Quad-Band GSM/GPRS |
| Operating Voltage | 3.7V to 4.2V (Li-Po Battery) |
| Flash Memory | 4MB |
| RAM | 520KB SRAM |
| Connectivity | GSM 850/900/1800/1900MHz, GPRS Class 12 |
| Charging Circuit | Integrated Li-Po Charger with USB Input |
| SIM Card Slot | Micro-SIM Compatible |
| Antenna | External SMA Connector for SIM800L |
| Board Dimensions | Approximately 55mm x 35mm x 10mm |
Key Features
- Integrated Power Management Unit with automatic USB/battery switching and Li-Po charging circuit for seamless portable operation
- Dual-core ESP32 processor with 240MHz clock speed and 520KB RAM enabling complex IoT applications and real-time data processing
- SIM800L GSM module supporting voice calls, SMS messaging, and GPRS data connectivity across 850/900/1800/1900MHz bands globally
- Unsoldered configuration allowing custom header placement, antenna routing, and component-level customization for production designs
- 4MB flash memory with OTA firmware update capability via cellular connection for remote device management
- Built-in 32.768kHz RTC crystal for accurate timestamp logging and scheduled task execution
- Comprehensive GPIO support including SPI, I2C, UART, ADC channels, and PWM outputs for sensor integration
- Micro-USB charging port with integrated protection circuits and battery level monitoring
Applications and Use Cases
- Remote GPS tracking devices for vehicles and assets using cellular GPRS data transmission with real-time location updates
- Industrial IoT monitoring systems for remote machinery, environmental sensors, and equipment diagnostics with cellular alarm notifications
- Smart agriculture applications monitoring soil moisture, temperature, and humidity with automated SMS alerts to farmers
- Emergency alert systems and panic buttons for security applications requiring cellular connectivity independent of WiFi infrastructure
- Battery-powered environmental monitoring stations collecting air quality, weather, and pollution data with periodic cellular data upload
- Prototype development for cellular IoT products with integrated power management and carrier-grade GSM connectivity
- Smart metering and utility monitoring solutions for remote meter reading and consumption tracking via GPRS
- Wearable health monitoring devices transmitting vital signs and health alerts through cellular network
How to Use
Begin by soldering appropriate pin headers to the unsoldered pads according to your project requirements. Insert a micro-SIM card with active 2G GSM service into the SIM card slot, ensuring proper orientation. Connect the external antenna to the SMA connector on the SIM800L module for optimal cellular signal reception. Attach a 3.7V to 4.2V lithium polymer battery to the battery connector, or use the micro-USB port for direct power and charging. Connect your development computer via USB to program the ESP32 using the Arduino IDE or ESP-IDF framework with appropriate SIM800L AT command libraries.
Configure the serial communication between ESP32 and SIM800L module using UART pins (typically GPIO16 for RX and GPIO17 for TX). Initialize the SIM800L with AT commands to register on the network, establish GPRS connection, and configure SMS or voice functionality as needed. Implement power management strategies using the integrated PMU to optimize battery life, such as enabling light sleep modes during idle periods and scheduling cellular transmissions. Test signal strength using AT+CSQ command and monitor battery voltage through ADC pins to implement low-battery warnings and graceful shutdown procedures.
Frequently Asked Questions
What is the difference between soldered and unsoldered versions of TTGO TCall PMU?
The unsoldered version comes without pin headers, antenna connectors, and battery connectors pre-soldered to the PCB. This allows developers to customize header placement, choose specific connector types, and optimize component positioning for their specific application. The soldered version comes fully assembled and ready to use immediately. Choose unsoldered for custom designs and production optimization, soldered for rapid prototyping.
Can this module work without a battery, using only USB power?
Yes, the integrated power management circuit allows operation directly from USB power without a battery connected. However, the module is optimized for battery operation, and the PMU intelligently manages power distribution between USB and battery sources. For always-on applications, USB power is suitable, but battery backup is recommended for IoT applications requiring continuous operation during power outages.
What type of SIM card does this module require?
The TTGO TCall PMU uses a micro-SIM card slot (15mm x 12mm), which is the standard SIM format for most 2G and 3G devices. Ensure your SIM card is activated with an active 2G GSM plan from your carrier. Some carriers may require enabling 2G access in their network settings as they phase out 2G services. Nano-SIM cards can be used with a micro-SIM adapter.
What is the typical battery life with this module?
Battery life depends heavily on usage patterns. In idle mode with periodic data transmission every 30 minutes, expect 7-10 days from a 2000mAh Li-Po battery. Continuous voice calls drain the battery in 3-5 hours. Light sleep modes can extend battery life to several weeks for applications transmitting data only once daily. Implement aggressive power management and disable unnecessary peripherals to maximize battery duration.
Does this module support WiFi connectivity in addition to cellular?
Yes, the ESP32 processor includes integrated WiFi (802.11 b/g/n) and Bluetooth 4.2 capabilities. The SIM800L provides cellular GSM/GPRS connectivity. You can use WiFi for local connectivity and programming, while the SIM800L handles cellular communication. This dual connectivity allows fallback mechanisms where the device uses WiFi when available and switches to cellular when WiFi is unavailable.
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 PMU ESP32 Wireless Module SIM Antenna SIM Card SIM800L Module Unsoldered Online in India
Purchase the TTGO TCall PMU ESP32 Wireless Module SIM Antenna SIM Card SIM800L Module Unsoldered online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on TTGO TCall PMU ESP32 Wireless Module with