What is SIM900 GSM module?
The SIM900 is a complete Quad-band GSM/GPRS solution in a SMT module which can be embedded in the customer applications. Featuring an industry-standard interface, the SIM900 delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption.
What is A6 GSM module?
The A6 Module provides a serial port to communicate via GPRS, sending text messages and phone calls. The GPRS functions can be used for IoT project which does not require WiFi connection condition. The GSM functionality of the module provides more ways to send commands to your IoT device.
What is CNMI?
The AT command +CNMI is used to specify how newly arrived SMS messages should be handled. You can tell the GSM/GPRS modem or mobile phone either to forward newly arrived SMS messages directly to the PC, or to save them in message storage and then notify the PC about their locations in message storage.
What should the voltage be on a sim900 power supply?
Operating Voltage – 3.2V to 4.8V Operating Current – Upto 2A The module consumes around 300mA current while under normal operating conditions, and around 2A current during transmit bursts. Recommended operating voltage is around 4V.
Is the A6 based on the sim900 chip?
It is A6 tagged as a replacement of SIM900 and seems to be based on GSM/GPRS A6 chip. Also in the web I found several modifications tagged both as SIM900 and A6 ( 1, 2, 3 ), and all of them have different power consumption (1.3mA, 1.5mA, 2mA).
How to use Arduino GSM shield sim900 step by step?
You can find 4.1V regulated and supplied from the shield in both OFF and ON states. After you supply Arduino or Microcontroller from your GSM Module, Arduino or Microcontroller can power ON the Module as described in Step 3. Then you can start using the Module normally.
What causes a voltage drop in a GSM module?
The peak working current can rise up to 2A during maximum power transmitting period, which will cause a voltage drop. So the power supply must be able to provide sufficient peak current, if not, the voltage may drop lower than 3.1V, and the module will automatically power down see 2.1 Power Supply Design