GSM/GPRS SIM900 Shield Module Send & Receive SMS Calls

GSM/GPRS SIM900 Shield Module Send & Receive SMS Calls provides a complete cellular communication solution for development projects and embedded systems. The module supports sending and receiving SMS messages and making and receiving voice calls over GSM/GPRS networks, making it suitable for remote control, alarm systems, telemetry devices, and tracking stations. Key specifications: • Network: GSM/GPRS 850/900/1800/1900 MHz.• Power supply: DC 3.4–4.4 V (nominal 4.0 V). • Power consumption: - Sleep mode: approximately 7 mA. - Active communication: approximately 220 mA, with peak currents up to 2.5 A. • Operating temperature: −40 to +85 °C. • Communication interfaces: UART with default settings 115200-8-N-1 for straightforward integration with microcontrollers and development boards. • Command support: standard AT commands (GSM 07.07, 07.05) plus extended AT command set for advanced control. • Messaging features: full SMS support with control and programming via AT commands. • Data and networking: built-in TCP/IP stack and GPRS Class 10 support with CS-1 to CS-4 options for reliable and efficient data transfer. • Antenna options: SMA and IPEX connectors to attach external or internal GSM antennas depending on application requirements. • Audio and media: speaker and microphone inputs/outputs to support voice calls and audio-capable applications. The SIM900 shield is designed for easy UART integration with microcontrollers such as Arduino and similar platforms, offering flexible power and connectivity options for a wide range of embedded cellular applications.