Smart Doorbell

The Smart Doorbell project allows the user to interact with environment with both input and output modules. The Ultrasonic Distance Sensor Module is used to detect if there is a person or a hand in front of the doorbell. If anything is near it, it detects and sends a feedback to script, allowing the user to play a sound with a buzzer.

About Tools and Materials:

SMD Red (Robot Shop)

SMD USB Gateway (Robot Shop)

Buzzer Module (Robot Shop)

Ultrasonic Distance Sensor Module (Robot Shop)

Step 1: Hardware & Software Overview

Project Key Components

1. SMD

   The SMD acts as a bridge between the script and the modules. It is responsible for interpreting the commands sent by the script and translating them into actions that read input from the Ultrasonic Distance Sensor Module and play an alert sound with the Buzzer Module.

2. Buzzer Module

   The Buzzer Module is connected to the system for the most crucial role for the application, that is alerting the user when something is nearby.

3. Ultrasonic Distance Sensor Module

   The Ultrasonic Distance Sensor Module is used to detect if anything is nearby and if there is, how many centimeters away.

4. SMD Libraries

   The SMD library is at the heart of the application. It communicates with the SMD using a specific communication protocol, sending commands to read the Ultrasonic Distance Sensor Module and play an alert sound with the Buzzer Module.

Project Key Features

• Proximity-Based Activation

  The project uses the module with the HC-SR04 to detect the surroundings via ultrasonic sound waves. It makes a great way to understand how physics of sound works and also see that it is a way of interacting with environment with such an input sensor.

• Adjustable Sensitivity

  The user can change the sensivity of the distance check, customizing it to be more sensitive or unresponsive to near surroundings.

• Real-time Monitoring

  The script can easily provide the real-time distance monitoring if the user add a simple line. It enhances the code and gives more opportunity to monitor the surroundings.

Step 2: Assemble

Getting Started

1. Hardware Setup

   • Connect the SMD to the PC or Arduino board using USB Gateway Module or Arduino Gateway Module.

   • Connect the Ultrasonic Distance Sensor Module and the Buzzer Module to the SMD using an RJ-45 cable.

   • Make sure that the SMD is powered and all connections are correct.

Project Wiring Diagram

Step 3: Run & Test

1. Run the Script

   • Run the script on your computer. This will establish communication with the SMD and initiate control of the Ultrasonic Distance Sensor Module and the Buzzer Module.

2. Observe Buzzer Activation

   • Use an object or a hand to trigger the Ultrasonic Distance Sensor Module, if it will detect an obstacle in the specified range, the script will send a signal to the Buzzer Module to alert the user.

Project Codes

Python Code

from smd.red import *

SerialPort = "COM3"        # Serial port of the USB gateway module
baudrate = 115200          # Baud rate of communication
ID = 0                     # ID of the SMD
buzzer_module_id = 1       # ID of the buzzer module
distance_module_id = 1     # ID of the ultrasonic distance sensor module

master = Master(SerialPort, baudrate)       # Defines the USB gateway module
master.attach(Red(ID))                      # Gives acces to the SMD of specified ID
master.scan_modules(ID)                     # Scans and identifies the modules that are connected to the SMD

while True:
    distance = master.get_distance(ID, distance_module_id)      # Variable to store the ambient light data
    print(distance)                                             # Printing the value to observe 

    if distance < 15:
        master.set_buzzer(ID, buzzer_module_id, 600)            # Number is correspond to the frequency of the buzzer
    else:
        master.set_buzzer(ID, buzzer_module_id, 0)              # Sets the buzzer frequency to 0, meaning turning the buzzer off

Arduino Code

#include <Acrome-SMD.h>

#define ID        0           // ID of the SMD
#define BAUDRATE  115200      // Baud rate of the communication

Red master(ID, Serial, BAUDRATE);       // Defines the Arduino gateway module

int buzzer_module_id = 1;               // ID of the buzzer module
int distance_module_id = 1;             // ID of the ultrasonic distance sensor module

int distance = 0;                       // Variable to store the distance data

void setup() {
    master.begin();                     // Starts the communication
    master.scanModules();               // Scans for the connected modules
}

void loop() {
    distance = master.getDistance(distance_module_id);      // Getting the distance data and storing it
    
    if (distance < 15) {
        master.setBuzzer(buzzer_module_id, 600);            // Number is correspond to the frequency of the buzzer
    }

    else {
        master.setBuzzer(buzzer_module_id, 0);              // Sets the buzzer frequency to 0, meaning turning the buzzer off
    }
}