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

• Elecrow A7 GSM GPRS GPS Module with Mega32U4 3 In 1 Development Board

• Wireless Module Ai-Thinker A7 GSM GPRS GPS

• Pro Micro ATmega32U4

• IRLIZ44N MOSFET