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A7ModuleTest

This is a test program for the Ai-Thinker A7 module connected to an Arduino Pro Micro or the Elecrow 32u4 with A7 module.

Used PINs

The pin layout is taken from the Elecrow 32u4 with A7 module.

  • 4 RESET ... with the Arduino Pro Micro this pin must be connected via a N-channel MOSFET (e.g. IRLIZ44N) to the A7 reset pin.

  • 5 ENABLE

  • 8 PWRKEY

  • 10 GPS RX software serial

  • 16 GPS TX software serial (not used)

Serial Connections

  • Serial is console

  • Serial1 is the hardware serial port to the A7 GSM UART

  • SoftwareSerial( 10, 16 ) serial port to A7 GPS UART (RX=10, TX=16)

Console Commands

GPS

you can switch on and off the GPS serial port

  • gps=on
  • gps=off

GSM / GPRS

  • every command starting with at is directly send to the GSM UART

  • if you like to send characters not starting with at start with a '-char as first character.

  • ctrlz is sending a CTRL-Z char to the GSM UART

Boot Sequence

At the program start RESET, ENABLE and PWRKEY are set to HIGH level. After 3s RESET is set to LOW level.

Modules