How to Send SMS From A9G Board by Sending AT Commands From Raspberry Pi Pico W Using MicroPython Programming

In today's interconnected world, communication is key. Whether it's for IoT applications, remote monitoring, or simple notifications, the ability to send SMS messages from a microcontroller can be incredibly useful. In this guide, we'll explore how to leverage the power of the Raspberry Pi Pico W and the A9G board to send SMS messages effortlessly.

To embark on this journey, ensure you have the following:

• Raspberry Pi Pico W

• A9G board

• USB cables for both devices
• Jumper wires
• Computer equipped with Thonny IDE or any compatible IDE
• Fundamental understanding of Python programming

• Connect the Raspberry Pi Pico W to your computer using a USB cable.
• Power up your A9G Board by Connecting the A9G board to your computer via USB cable.
• Connect Raspberry Pi Pico with A9G as per below connection Diagram.

• Launch Thonny IDE and create a new Python script.
• Write and upload the requisite code to establish serial communication with the A9G board.

Here's a Python script to send an SMS using the Raspberry Pi Pico W and the A9G board:

# Import required libraries
import machine
import time

# Configure UART for communication with the A9G module
uart = machine.UART(0, baudrate=115200, tx=machine.Pin(0), rx=machine.Pin(1)) # UART0 on Pico

# Function to send AT commands and receive responses
def send_at_command(command):
    uart.write(command + '\r\n')       # Send the command
    time.sleep(3)                       # Wait for response
    response = uart.read()              # Read the response
    if response:
        print("Response:", response.strip())  # Print the response
        return response.strip()
    else:
        print("No response received.")  # Print if no response received
        return None

# Function to send an SMS
def send_sms(phone_number, message):
    # Set text mode
    response = send_at_command('AT+CMGF=1')
    if not response or b'OK' not in response:
        print("Failed to set text mode.")
        return

    # Set recipient number
    response = send_at_command('AT+CMGS="{}"'.format(phone_number))
    if not response or b'>' not in response:
        print("Failed to set recipient number.")
        return

    # Send message
    response = send_at_command(message)
    if not response:
        print("Failed to send message.")
        return

    # Send Ctrl+Z to end message
    uart.write(chr(26))
    time.sleep(1)

# Example usage
phone_number = '+91XXXXXXXXXX'  # Replace with recipient's phone number
message = 'Hello, this is a test message from Raspberry Pi Pico W with A9G board!'
send_sms(phone_number, message)

With the provided code and setup instructions, you can now easily send SMS messages using the Raspberry Pi Pico W and the A9G board. Whether you're building IoT applications or remote monitoring systems, the ability to send SMS messages adds a powerful communication layer to your projects. Experiment with different messages and recipients to explore the full potential of this functionality!