MELIFE 2 Pack ESP32 ESP-32S Development Board 2.4GHz Dual-Mode WiFi + Bluetooth Dual Cores Microcontroller Processor Integrated with ESP32s Antenna RF AMP Filter AP STA for Arduino IDE

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Description:
With basic phone / SMS, GPRS networking communications
Can connect external 30W / 200W camera
Can add a traditional slot machine

Features:
-Complete quad-band GSM / GPRS module, 800/900/1800 / 1900MHz
-Sleep current is less than 2mA
-Support digital audio and analog audio, support for HR, FR, EFR, AMR voice coding
-Support voice calls and SMS messages, embedded network service protocol stack
-Support the standard GSM07.07,07.05 AT commands and safe letter scalable instruction set
-Support USSD and PBCCH, support UART interface to download

Debugging:
Use USB to TTL serial cable, VUSB â†’ 5V; GND â†’ GND; AT_TX â†’ RX; AT_RX â†’ TX
Use USB cable to power the board,GNDâ†’GNDï¼›AT_TXâ†’RXï¼›AT_RXâ†’TX
Use lithium battery to power the board, VBATâ†’(3.3v-4.2)V; GNDâ†’GNDï¼›AT_TXâ†’RXï¼›AT_RXâ†’TX(Press power_key button for 2S)

Application:
-Use GPRS, as well as acceleration sensors for vehicle immobilizer.
-Remote monitoring intercom using GSM and microphone / speakers
-Use GPRS / GSM, for Smart watch with 1.54 "capacitive touch screen,heart rate oximeter sensor, 1.54-inch capacitive touch screen monitor the elderly
-Use GPRS + TF + camera extension board remote monitoring camera
-Wechat payment slot machine scheme using slot machine
-Using onboard features, custom device based on Lua programming

Package Included:
1 X GPRS GSM A9 Development Board
1 X GSM Antenna
1 X GPRS Antenna

It can be used in a wide range of IoT applications for home automation, industrial wireless control, wearable electronics, wireless location-aware devices, wireless location system signals and other IoT applications, making it ideal for IoT applications.
This a9g board has GPS function,with GPS passive antenna. But its GPS function is not good. If you need gps module, I recommend bn-180 gps, https://www.amazon.com/dp/B078Y4XZN9
You need an external MCU or AVR to send AT commands and control the board, or to make your own firmware for the board itself
You should use it with cp2102 serial module. The connection between A9G board and CP2102 module is RX to TX, TX to RX, GND to GND. Then you connect USB interface to your computer's USB interface (it need to be 5V),and open the IDE, you will see COM port. There is no need to choose board. You just need to open the serial monitor window and choose 115200 baud, then will see the information, make a call and send message by command.
If you have any issue when using our product,or you need product use documentation， please contact us directly for assistance.we will solve your problem in 24 hours.

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A9G Module GPRS GSM BDS Development Board Quad-Band 800/900/1800 / 1900MHz SMS Voice Wireless Data Transmission IOT with Antenna Geekstory

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