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DescriptionAdding cellular connectivity to a project usually requires expensive, bulky shields. The M590E GSM/GPRS Module breaks that trend, offering a stripped-down, purely data-driven cellular modem in an ultra-compact footprint.Whether you are designing a fleet of remote agricultural soil monitors that text you when fields are dry, or building a standalone smart-home security alarm that alerts your phone when the power goes out, this kit provides the essential wireless backbone.The Unassembled DIY Kit ExperienceThis product is shipped as an unassembled DIY soldering kit. You will need basic soldering skills to attach the components to the green breakout board. The kit includes:The Neoway M590E surface-mount moduleThe breakout PCB (with clearly labeled pins)A standard-size SIM card holderA helical copper spring antennaMale header pins, an LED, a capacitor, and a voltage-dropping diode.Pro-Tip: The M590E module itself features castellated edges (half-holes). When soldering it to the main PCB, use the “drag soldering” technique or carefully tack down opposite corners first to ensure it remains perfectly flat and aligned.Powering the Beast (The Included Diode)Cellular modules are incredibly power-hungry. While they might idle at a few milliamps, the moment they connect to a cell tower to send an SMS, they can pull massive, instantaneous current spikes of up to 2 Amps. You cannot power this module directly from an Arduino’s 5V or 3.3V pin; it will instantly crash your board. You must use a dedicated, robust power supply capable of delivering 2A. Why the diode? The M590E operates optimally around 3.9V to 4.3V. If your main power supply is 5V, you solder the included rectifier diode in series with the VCC line. The diode naturally burns off about 0.7V, dropping your 5V supply down to a perfectly safe 4.3V for the module.Data and SMS (No Voice)To keep the cost and footprint as low as possible, the M590E was designed strictly for machine-to-machine (M2M) communication. It has an onboard TCP/IP stack for connecting to servers via GPRS, and it handles SMS text messages flawlessly. However, it completely lacks analog audio pins (no mic or speaker outputs), meaning it cannot be used to make or receive voice calls.Key Features:AT Command Control: Fully controlled via a standard UART serial interface. Simply send standard AT commands (e.g., AT CMGS for sending a text) from your microcontroller.Boot Pin: Features a dedicated BOOT pin that must be pulled LOW to turn the module on, allowing your microcontroller to hard-reset the modem if it ever loses network connection.Integrated TCP/IP: Send data directly to your custom web servers or IoT dashboards using built-in TCP and UDP protocols.Technical Specifications:Cellular Module: Neoway M590ESupported Frequencies: Dual-Band EGSM 900 MHz / DCS 1800 MHzOperating Voltage: 3.3V to 4.5V DC (3.9V recommended)Peak Current: ~2A (during transmission bursts)Idle Current: < 3mACommunication Interface: UART (TTL logic level)Default Baud Rate: Typically 9600 or 115200 bpsAntenna Type: Helical copper spring (Requires soldering to the board)Ideal Applications:Remote IoT environmental data loggers (transmitting data to the cloud via GPRS)Anti-theft vehicle tracking devices (sending GPS coordinates via SMS)Automated SMS alert systems for server rooms or industrial equipmentIntermediate surface-mount soldering practice kits