Published May 25, 2021

Privacy Mode with Magicbit (ESP32)

In this tutorial we learn about how to close a window in your laptop when someone open the door using Magicbit

IntermediateProtip325

Things used in this project

Hardware components

Magicbit

Proximity Sensor

Software apps and online services

Arduino IDE

Story

In this tutorial we learn about how to close a window in your laptop when someone open the door using Magicbit

Theory and Methodology

We are using awesome of ESP32 , which can be used as Bluetooth Keyboard. So you can trigger any key press event from your Arduino code. In this project we get the input from proximity sensor and execute ALT+F4 (Window close) event from Magicbit. You need to setup Magicbit at the door such that when someone enter to the room proximity sensor value changes.

Hardware Setup

For this project we mainly used two hardware components. They are Magicbit and Proximity Sensor.

Proximity Sensor

Now you Connect the Proximity Sensor to the 32 PIN on the Magicbit board. And then upload the Arduino code into the Magicbit board

Privacy Mode with Magicbit

/**
 * This example turns the ESP32 into a Bluetooth LE keyboard that writes the words, presses Enter, presses a media key and then Ctrl+Alt+Delete
 */
#include <BleKeyboard.h>

BleKeyboard bleKeyboard;

void setup() {
  Serial.begin(115200);
  Serial.println("Starting BLE work!");
  pinMode(16,OUTPUT);//Check Bluetooth connection between Magicbit andcomputer
  pinMode(18,OUTPUT); //Check Proximity Sensor
  bleKeyboard.begin();
}

void loop() {
  if(bleKeyboard.isConnected()) {
    digitalWrite(18,!digitalRead(18));
    Serial.println("Sending 'Hello world'...");
Serial.println(analogRead(39));
Serial.println(analogRead(32));
     
    if(analogRead(32)>analogRead(39)){
    bleKeyboard.press(KEY_LEFT_ALT); //bluetooth key board left_Alt_key
    bleKeyboard.press(KEY_F4); //bluetooth key board F4_key
    digitalWrite(16,LOW);
    }
    digitalWrite(16,HIGH);
    bleKeyboard.releaseAll(); //press Alt+F4 Key
  }
  if(analogRead(32)>analogRead(39)){

    digitalWrite(16,LOW);
    }
  Serial.println("Waiting 5 seconds...");
  delay(1000);
}

Credits