10/2/2023 0 Comments Gsm library arduino download![]() ①If the voltage ≤ 3.3V, the following URC will be presented: 4, Over-voltage or Under-voltage Automatic Power Down: SIM900 will constantly monitor the voltage applied on the VBAT.Before the completion of the power down procedure the SIM900 will send out result code: When GPRS Shield power dowm in Normal power down procedure, the procedure lets the SIM900 log off from the network and allows the software to enter into a secure state and save data before completely disconnecting the power supply. 3, Normal power down procedure: Turn off the GPRS shield by sending AT command "AT+CPOWD=1" to SIM900 module.The following code is power down subroutine for Arduino if using software triger: void powerDown() The connection topology is shown in the diagram below:įigure of Timing of turning off GPRS Shield using Software Triger A patch cord is also supplied with the GPRS Shield to interface the antenna to the board. ![]() The GSM Antenna supplied with the GPRS Shield has an SMA connector (and not an RP-SMA connector) on it. The connector present on the GPRS Shield is called a U.FL connecto. Make sure the antenna pad buckled properly - A miniature coaxial RF connector is present on the GPRS Shield board to connect with a GSM Antenna.Both 1.8 volts and 3.0 volts SIM Cards are supported by SIM900 - the SIM card voltage type is automatically detected. Insert an unlocked SIM card to SIM Card Holder - 6 Pin Holder for SIM Cards.GPIO,PWM and ADC of SIM900 - GPIO,PWM and ADC pins breakout of SIM900ĭ0 - Unused if you select hardware serial port to communicate with GPRS Shieldĭ1 - Unused if you select hardware serial port to communicate with GPRS Shieldĭ7 - Used if you select software serial port to communicate with GPRS Shieldĭ8 - Used if you select software serial port to communicate with GPRS Shieldĭ9 - Used for software control the power up or down of the SIM900 UART of SIM900 - UART pins breakout of SIM900 Net light - tell the status about SIM900 linking to the net Status LED - tell whether the power of SIM900 is on Software serial - D7/D8 of Arduino/Crowduino/Seeeduino only Hardware Serial - D0/D1 of Arduino/Crowduino/Seeeduino Serial port select - select either software serial port or hareware serial port to be connected to GPRS Shield Power jack - connected to external 4.8~5VDC power supplyĪntenna interface - connected to external antenna Power select - select the power supply for GPRS shield(external power or 5v of arduino) ![]() (Can be changed using AT commands).įor SIM900's Specifications, please refer this PDF file: SIM900_SPEC.pdf Item
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