Low Cost Arduino Smart Doorbell




In this Instructables, I will show you how to create a low-cost smart doorbell for around $30 range. In this design, I use an Arduino Wemos with a built Wifi chip to so that the doorbell can communicate wirelessly with your smartphone. The following features are supported in this built. The doorbell current does not have live stream video.However, it capable of taking a picture when someone is at the door and send it to your phone with a datestamp. In addition, there is also motion detect feature in case there someone at the door but they did not press the doorbell.

Overall the following features are supported in this project:

  • Alert when doorbell is pressed
  • Motion detection
  • Photo capturing
  • Wireless Control

In the future, I hope to incorporate 10s video feature like Snapchat when someone is at the door or the doorbell is pressed.

Step 1: Materials

Step 2: 3D Files

Download the files below and printed all of them out with around 30% thickness. Once you had all the files printed you can begin constructing the your very own smart doorbell.

Step 3: Download

The following files include .STL and .STP of all the mechanical part. Use winrar to unzip.

Step 4:

  • First, put the camera into the camera case
  • Put the button into the button case
  • The camera case should be a tight-fit for the camera and no screw is necessary
  • For the button case, take a screw that fit the middle opening on the button module and screw it down to the case
  • Make sure the the button is secure tightly on it's case

Step 5:

  • Screw the both the two new module you just make (camera and button module) to the bottom side of the Top piece of the smart doorbell.
  • The hole for the camera is the topmost hole and button is the bottom-most hole. Alternatively, you can just try each hole until they fit since each the camera can only fit one of the three holes.
  • You probably need only around 3-4 screws for each module to make them secure.
  • Make sure both modules is secure and move on to next step.

Step 6:

  • This step we add the Motion Sensor into the back of the Top piece.
  • The hole for the sensor is the middle hole. Simply push it in and make and make sure that it is secure. No need for a case for this module.
  • You can also tape the board to the bottom of the camera module if you want to make it more secure.

Step 7:

Step 8:

  • Attached the SD card slot to the Bottom piece as shown above.
  • Make sure that the side with the pin is facing toward the wall with an opening.
  • Secure the SD card slot with 2 screws.

Step 9:

  • Now put the Arduino into the Bottom piece as shown above.
  • Make sure that you connected the micro USB cable to the Arduino in this step.
  • The micro USB cables should be going out of the opening on the wall.
  • Secure the Arduino with one or two screws and it should be good enough

Step 10:

  • Now put the Top piece on top of the Bottom piece.
  • Secure it down with 4 screws on each corner as shown in the picture above.

Step 11:

  • Now put on the 2 cover pieces
    • The white pieces is on top .( top is the wall with opening)
    • The black pieces go on bottom
  • These pieces should be a tight fit and no screws is necessary.

Step 12: Software : Android App

This is an custom built android app that communicate directly with the webserver that the Arduino Wemost put out . The app simply pull data from that webserver whenever there something new is being update. In the app, you can see doorbell notification and log with date stamp. In you click on one of these log you can see the picture that being taken and some more information such as whether the door bell was pressed or not .

Step 13: Wiring

Arduino Wemos to Camera

  • D1 -------- TX
  • D0 -------- RX
  • 5V -------- VCC
  • GND------ GND

Note : Only use 4 pin, leave unsued pin alone

Arduino Wemos to SD Card Slot

  • D13----------SCK
  • D12----------MISO
  • D11----------MOSI
  • D10----------SS
  • 5V -----------VCC
  • GND--------GND

Arduino Wemos to Motion Sensor

  • D2------------Out
  • 5V--------------5V
  • GND-----------GND

Arduino Wemos to Digital Button

  • D12-----------Out
  • 5V-------------5V
  • GND----------GND

Step 14: Software : Arduino

In this section, I am just going briefly on how to interface the Arduino Wemos with the button, camera/sd card slot, and the motion sensor. This is simply a short tutorial that shown you how these components. In addition, I will also show you how to how to access wifi and transmit data to your android app using the Arduino Wemos.

Motion Sensor

The below is the code for motion sensor

 * PIR sensor tester
int inputPin = 16;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
void setup() {
  pinMode(inputPin, INPUT);     // declare sensor as input
void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
  } else {
    if (pirState == HIGH){
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;

This Motion Sensor had a delay of 8 seconds so it will not be instantaneous when there is is not motion when a motion is just detected.

Step 15:

Below is simple code to interface with the button

 *Button tester
int inputPin = 12;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
void setup() {
  pinMode(inputPin, INPUT);     // declare sensor as input
void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    Serial.println("Button Pressed");     

This code simply printed out button pressed on the serial monitor when you pressed the button.

Step 16:

The code below interface with the camera , sd card slot and button. When the button is pressed the camera take a picture and save it onto the sd card slot.

#include <camera_VC0706.h>
#include <SD.h>
#include <SoftwareSerial.h>

#define chipSelect 10
#if ARDUINO >= 100
SoftwareSerial cameraconnection = SoftwareSerial(2, 3);
NewSoftSerial cameraconnection = NewSoftSerial(2, 3);
camera_VC0706 cam = camera_VC0706(&cameraconnection);
void setup() {

#if !defined(SOFTWARE_SPI)
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
	if(chipSelect != 53) pinMode(53, OUTPUT); // SS on Mega
	if(chipSelect != 10) pinMode(10, OUTPUT); // SS on Uno, etc.

	Serial.println("VC0706 Camera test");

	if (!SD.begin(chipSelect)) {
		Serial.println("Card failed, or not present");

	if (cam.begin()) {
		Serial.println("Camera Found:");
	} else {
		Serial.println("No camera found?");

	char *reply = cam.getVersion();
	if (reply == 0) {
		Serial.print("Failed to get version");
	} else {

	uint8_t imgsize = cam.getImageSize();
	Serial.print("Image size: ");
	if (imgsize == VC0706_640x480) Serial.println("640x480");
	if (imgsize == VC0706_320x240) Serial.println("320x240");
	if (imgsize == VC0706_160x120) Serial.println("160x120");

	Serial.println("Get ready !");


void loop() {

	if(digitalRead(7)== 0) {
		if(digitalRead(7)== 0) {
			if (! cam.takePicture())
				Serial.println("Failed to snap!");
				Serial.println("Picture taken!");
			char filename[13];
			strcpy(filename, "IMAGE00.JPG");
			for (int i = 0; i < 100; i++) {
				filename[5] = '0' + i/10;
				filename[6] = '0' + i%10;
				// create if does not exist, do not open existing, write, sync after write
				if (! SD.exists(filename)) {
			File imgFile = SD.open(filename, FILE_WRITE);
			uint16_t jpglen = cam.frameLength();
			Serial.print(jpglen, DEC);
			Serial.println(" byte image");

			Serial.print("Writing image to ");

			while (jpglen > 0) {
				uint8_t *buffer;
				uint8_t bytesToRead =  min(32, jpglen); 
				buffer = cam.readPicture(bytesToRead);
				imgFile.write(buffer, bytesToRead);
				jpglen -= bytesToRead;
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    7 Discussions


    Question 9 months ago on Introduction


    did you manage to do the mentiones 10sec video? Would it be possible to save the video on a server via wifi?

    What is the reason to why there can not be a live stream?

    Thanks and great job!


    Question 1 year ago

    Can you give that custom built Android App...?


    1 year ago

    Hi, is it possible to share the custom app that you built? Thanks


    1 year ago

    ... Can you please tell me, from where you got the library for the Camera (

    camera_VC0706.h) ?


    1 year ago

    Looks great! Can you provide your App? What about the connection between wemost and phone? How is this going? Greetings

    1 reply

    Reply 1 year ago

    What app this project use ?


    2 years ago

    Great !, Can you tell me if it's work on iPhone (iOS)