Skip to content

Latest commit

 

History

History
59 lines (50 loc) · 3.74 KB

PMEAS Code Explanation.md

File metadata and controls

59 lines (50 loc) · 3.74 KB
Raw

Code Explanation

This code is written for a medical emergency alert system using a GSM module. It utilizes a button to trigger an emergency alert, which sends an SMS and makes a call to a predefined number.

Libraries

The code includes the SoftwareSerial library, which allows serial communication on pins other than the default Serial communication pins (0 and 1).

Pin Definitions

  • BUTTON_PIN (4): The pin connected to the button that triggers the emergency alert.
  • LED_PIN (2): The pin connected to an LED indicator.
  • BUZZER_PIN (3): The pin connected to a buzzer.
  • LED2_PIN (5): The pin connected to a second LED indicator.
  • BUZZER2_PIN (6): The pin connected to a second buzzer.

Setup Function

The setup() function is called once when the microcontroller starts. It initializes the GSM module and sets the pins as inputs or outputs. The setup tasks include:

  • Initializing the SIM900A SoftwareSerial object with the RX (receive) and TX (transmit) pins connected to the GSM module (9 and 10, respectively).
  • Setting the baud rate of the GSM module to 9600 using SIM900A.begin(9600).
  • Starting the serial communication with the Serial Monitor in the Arduino IDE at a baud rate of 9600 using Serial.begin(9600).
  • Configuring the button pin, LED pins, and buzzer pins as inputs or outputs.
  • Printing a message to the Serial Monitor to indicate that the text message module is ready.

SendMessage Function

The SendMessage() function is responsible for sending an SMS. It performs the following steps:

  • Sends the command AT+CMGF=1 to initialize the GSM module in text mode.
  • Waits for 1 second using delay(1000).
  • Sends the command AT+CMGS=\"+919618531821\"\r, where +919618531821 is the receiver's mobile number.
  • Waits for 1 second.
  • Sends the message content "PATIENT MEDICAL EMERGENCY ALERT SYSTEM".
  • Waits for 100 milliseconds.
  • Sends the end-of-message character (char)26 to indicate the end of the message content.
  • Waits for 1 second.

SendCall Function

The SendCall() function is responsible for making a call. It performs the following steps:

  • Prints a message to the Serial Monitor to indicate that the call is being made.
  • Initializes the SIM900A SoftwareSerial object with a baud rate of 9600.
  • Waits for 2 seconds using delay(2000).
  • Sends the command ATD8978722723; to make a call to the number 8978722723. Note that you need to replace this number with the desired phone number.
  • Prints a message to the Serial Monitor to indicate the number being called.
  • If there is data available to read from the GSM module, it reads and writes it to the Serial Monitor.

Loop Function

The loop() function is the main part of the code that runs repeatedly. It performs the following steps:

  • Reads the state of the button connected to BUTTON_PIN.
  • If the button is pressed (buttonState == LOW), the code executes the following steps:
    • Prints a message to the Serial Monitor to indicate that the button is pressed.
    • Enters a while loop that runs as long as the button is held down.
      • Turns on the LEDs (LED_PIN and LED2_PIN) and activates the buzzers (BUZZER_PIN and `

BUZZER2_PIN`). - Waits for 500 milliseconds. - Turns off the LEDs and deactivates the buzzers. - Waits for another 500 milliseconds.

  • If the button is held for more than 10 seconds (10,000 milliseconds), it calls the SendCall() function to make a call and the SendMessage() function to send an SMS.
  • Waits for 100 milliseconds.
  • If there is data available to read from the SIM900A SoftwareSerial object, it reads and writes it to the Serial Monitor.

That's the explanation of the provided code. It sets up the GSM module, detects button presses, and triggers an emergency alert by making a call and sending an SMS.