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DescriptionThe A7670E 4G LTE Cat1 DD-MCore-A7670E Core Board is a robust, industrial-grade 4G LTE Cat1 core development board engineered to power next-generation IoT, fleet tracking, and telemetry solutions. Specifically optimized for modern cellular infrastructure, this module offers a future-proof alternative to obsolete legacy hardware, ensuring reliable and high-speed data transmission across contemporary networks.Built around the powerful SIMCom A7670E chipset, the board seamlessly integrates multi-constellation GNSS tracking for precise real-time positioning and native Bluetooth connectivity for short-range wireless sensor integration. Its ultra-compact footprint features a standard breadboard-friendly 2.54mm pitch layout, a built-in Nano SIM slot, and a resilient 5V–12V wide-voltage power input. Designed to perform reliably in extreme environments, it is the ideal plug-and-play platform for engineers, developers, and system integrators building smart tracking systems, automated remote monitoring nodes, and industrial communication gateways.Technical SpecificationsCore Module: SIMCom A7670E 4G LTE Cat1Cellular Data Speeds: Up to 10 Mbps Downlink (DL) / 5 Mbps Uplink (UL)4G LTE FDD Bands: B1 / B3 / B5 / B7 / B8 / B20Positioning & Wireless: Integrated Multi-Constellation GNSS & Bluetooth (BT)Input Voltage Range: VIN 5V to 12V DCHardware Interfaces: UART Serial Port, Native USB, and IPEX 1 (U.FL) Antenna ConnectorSIM Card Layout: Onboard Nano SIM Card SlotPin Configuration: 7-Pin Header with standard 2.54mm pitch spacingPhysical Dimensions: 28mm × 26mm × 6.98mmOperating Temperature: Industrial Grade -40°C to 85°CSupported Protocols: TCP, IP, IPv4, IPv6, Multi-PDP, FTP, FTPS, HTTP, HTTPS, RNDIS, ECM, PPPStatus Indicators: Dedicated Onboard Power LED and Network Registration light Getting Started with A7670E 4G LTE Cat1 and ArduinoThe A7670E 4G LTE Cat1 DD-MCore-A7670E module communicates using serial AT commands. Because the Arduino Uno’s default hardware serial pins are used for the USB Serial Monitor, you must use SoftwareSerial to communicate with the core board.Hardware RequiredJumper WiresArduino Uno4G Nano SIM cardBreadboardCritical First Step: Changing the A7670E 4G LTE Cat1 Module Baud RateThe factory default baud rate for the A7670E chipset is 115200 baud. However, SoftwareSerial on an Arduino Uno is highly unstable above 57600 baud and will drop data packets. Before running complex scripts, you must change the module’s baud rate permanently to 9600 baud using a one-time configuration sketch:Upload a basic script sending the hardware instruction: AT IPR=9600.Power-cycle the core board to save the 9600 baud rate to its flash memory.Hardware Wiring LayoutThe core board features a 7-pin breakout header. Wire it to your Arduino Uno following this arrangement:Header Label (Top to Bottom)Arduino Pin / Target ConnectionDescription7. DTRLeave UnconnectedData Terminal Ready (Sleep wake control)6. NETLeave UnconnectedNetwork pulse output pin5. 3.8ENLeave UnconnectedPower enable (Module handles auto-boot)4. RXPin 11 (Arduino Software TX)Core Board Serial Data Receive Pin3. TXPin 10 (Arduino Software RX)Core Board Serial Data Transmit Pin2. GNDGND (Common Ground)Must connect to external power AND Arduino GND1. 5-12VPower Supply Positive ( )External Power Input (Do not use Arduino 5V pin)Power Requirements WarningCellular radio bursts draw high peak currents during network transmission. The Arduino Uno’s internal 5V regulator cannot supply enough current. You must connect an external power supply providing at least 6V to 12V with a 2A minimum current rating to the 5-12V power pin.LED Diagnostic Light GuideMonitor the onboard Network (NET) LED to quickly determine the connection state of your device:Slow Blinking (~5-second intervals): The module is powered on but has low power, is missing a SIM card, or is scanning for service without network registration.Fast Blinking (~100ms intervals): The module has successfully authenticated, locked onto a cell tower, and registered on the 4G network.Permanently Off: The module has shut down or is trapped in an unrecoverable power boot-loop due to insufficient current from the power supply.Network Access Point Name (APN) ConfigurationTo establish an active 4G mobile data session (for HTTP GET/POST requests), configure your code script with the appropriate carrier Access Point Name (APN). In Rwanda, both major telecommunications operators share an identical default APN setting:// Default configuration for Rwandan Mobile Networks const char APN[] = "internet";A7670E 4G LTE Cat1 SketchesChanging Baud ratepowered by Advanced iFrame Master toolpowered by Advanced iFrameReferencesFaranux repository: A7670E