Step 1: Materials

Hardware:

1- Arduino board

2- 1Sheeld and Android Smartphone/Tablet

3- Ultrasonic sensor HC-SR04

4- Jumper wires (Male to Female)

Software:

1. Arduino IDE (you can download fromhttps://www.arduino.cc/en/Main/Software)

2-You need to download and place 1sheeld library and 1Sheeld app from here:-http://1sheeld.com/downloads/

3- Download Ultrasonic library fromhttps://github.com/JRodrigoTech/Ultrasonic-HC-SR04...

Step 2: Code

Download it directly from"Mom is coming" GitHub repo

or c&p

****************CODE***********************

//Connect SRF 04 to 1Sheeld like this:

//Vcc >> +5 ..... Tri >> digital pin #12 .... Echo >> digital pin #13 .... GND >> Gnd

#include <VibrationShield.h>

#define CUSTOM_SETTINGS

#define INCLUDE_TEXT_TO_SPEECH_SHIELD

#define INCLUDE_VIBRATION_SHIELD

/* Include 1Sheeld library. */

#include <OneSheeld.h>

/* This pattern waits for 1 second and vibrate for 2, 3 times. */

int pattern[6] = {1000,2000,1000,2000}; int patternSize = 6;

#include "Ultrasonic.h"

Ultrasonic ultrasonic(12,13);

int distance;

void setup()

{

/* Start communication. */

OneSheeld.begin(); }

void loop() {

distance=ultrasonic.Ranging(CM);

// I make detection distance < 50 ... but you can change it as you want From 2cm to 400 cm

if (distance < 50)

{

/* Vibrate as the first pattern once. */

Vibration.start(patternSize,pattern);

/* Wait for 3 seconds. */

OneSheeld.delay(3000);

/* Stop the vibration. */

Vibration.stop();

TextToSpeech.say("Mom is coming");

}

}

Step 3: System Diagram >> Link it up

1-Install 1sheeld app on your smart phone. (you can install it directly from Play Store).

2-Connect the 1sheeld over the arduino board.

3-Connect the Ultrasonic sensor HC-SRF 04 to 1Sheeld like this:

//Vcc >> +5 ..... Tri >> digital pin #12 .... Echo >> digital pin #13 .... GND >> Gnd

4-Download 1 sheeld library into Arduino IDE.

5-Write the code on Arduino IDE after adjusting the detection distance from 2cm to 400 cm( I make it if < 50), connect Arduino board to PC and upload the code into Arduino board.

(Hint: Take care about Upload mode and Operating mode of the 1 sheeld board also Arduino UNO working on 5V).

6-Connect 1sheeld mobile app to 1sheeld board, select the required sheelds(vibration - text to speech) from 1sheeld app, and make a test.

Schematic

Congratulations, Now you do it yourself... :)

Any comments and suggestions will be welcome.