HQ SIM 900 Shield

Detail HQ SIM 900 Shield

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Instructions for use

Computer debugging USB - TTL can be. This module power supply: 5V-26V, if the 5V
power supply must be more than 2A, recommended 9V power supply. After plugging
in the Arduino motherboard, the power supply must be capable of supplying 2A.
The reason is that GPRS Shield boot current and the maximum peak current
required to work up to 2A, but the USB port is unable to provide such a large
current, it must be an external power supply equipment. The other way the power
supply pin leads to 3.7 - 4.5V power supply for lithium battery power supply.
Serial compatible arduino single chip. TTL serial port compatible with 3.3 and
5V microcontrollers.
Make sure your SIM card is not locked
GPRS Shield communication baud rate is best 19200 bps 8-N-1 (GPRS Shield default
auto-matching baud rate)
Refer to the figure below

1. Provide two kinds of antenna interface, compatible with various needs. This
product has been shipped with antenna antenna, antenna with adapter cable, so
compatible with two interfaces.

2. The SIM900 can be connected via jumper cap and connected to any two pins of
Arduino from D0 to D7, not just hardware UARTs that can only use D0D1.

3. Debug toggle switch, you can set the SIM900 DEBUG port connected to Arduino
or Arduino ATMEGA8U2 / FT232 connected to the PC, debug debugging.

4. Audio and microphone port leads.

5. SIM900 multiple IO port leads, if necessary, after the needle can be used
DuPont line connection - specific pin reference schematic and datasheet.

6. Three status indicators, as well as three buttons - where the power on button
can be reached by using Arduino's pin control software to POWER ON SIM900.

7. 3.3V and 5V automatic level comp

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