1, five elements to ensure stable performance:
A core: new original SIM800L module
B power supply filter capacitor: 1000uf quality chip tantalum capacitors (the largest market)
C anti-jamming circuit : TVS tube anti-surge, anti-static (for industrial field applications)
D connector: IPEX tinned copper needle (to ensure good contact)
E production processes : industrial chip technology (high temperature to ensure product is not damaged)
2, fully functional: telephone, SMS, GPRS network communication, multimedia messaging (MMS), dual-tone multi-frequency (DTMF) (with no other family, we took!)
A Phone: our cell phones and can receive calls, a call instruction "ATD150 **** 5417 ; Enter" on the line.
B SMS: text messaging, you can send a text message to their own devices, the control he operates! , Equipment failure, it can alert to you!
C GPRS: embedded TCP / IP protocol, direct and fixed public ip of computer communications, extensive data monitoring.
D MMS : MMS; can send pictures is very useful in the field of security and intelligent home!
E LBS : base station location; SIMCOM GPRS module comes with the base station location currently can not be used , because Google used SIMCOM base station location server not to use it!
F DTMF : Dual Tone Multi-Frequency, that is, during a call via the serial port that can be read by the other key, and we hit 10086, automatic selection by voice Give us 1, 2, 3 the same. Through this we can control the operation of the device, remote control alone.
3, compact appearance: L * W 25 * 25cm is currently the smallest, a variety of combinations can be embedded directly in the device.
4, power supply: 5V pin, USB and PC 1A phone charger can be. Buck received through the 5V pin on VBTA pins. Module standby current is very small, in the communication process relatively large power, peak current up to 2A. However, in the project, the design of the power supply to achieve the best 2A current output capacity.
The 5V must be very stable, easy alarm module or else
5, good compatibility: self-designed TTL level UART interface circuit only adaptation ( TTL) 3.3V and 5V available 51, STM32,430, AVR microcontrollers are directly driven, we have with routine!
6, pin standardization: Pin 2.54mm, two rows of pins spacing is an integer multiple of 2.54, and can be plugged directly into the universal plate test is very convenient!