## Goal
## Background
IFTTT can help connect all your different apps and devices which enables them to work together to do specific tasks.
Smart defense system operation
The motion sensor can deliver a motion signal to the micro:bit. When the micro:bit detects the signal, the buzzer will emit sound and send an email to specific email account through IFTTT. Also, a monstor icon will be shown on the micro:bit if there are suspicious people passes by.
## Part List
## Assembly step
Attach the motion sensor to F1 model. 
Step 2
Put together all the cardboard parts (F1-F2) 
Step 3
Assembly completed! 
## Hardware connect
Turn on the Buzzer Switch on P0 port of IoT:bit
*Pull the buzzer switch 'down' to connect the buzzer in this execrise* ## Programming (MakeCode)
* Snap `Initialize OLED with width:128, height: 64` to `on start` * Snap `Initialize IoT:bit TX P16 RX P8` from `IoT:bit` to `on start` * Snap `Set Wi-Fi to ssid pwd` from `IoT:bit` * Enter your Wi-Fi name and password. Here we set `smarthon` as `SSID` and `12345678` as `password` 
Step 2: Show icon "tick" after WiFi connection
* Snap `show icon` from `basic` to `On WiFi connected` and select icon `tick` *Snap `show string` to `On WiFi connected` and show `Device ID` 
Step 3. Check motion sensor value
* Snap `if statement` to block `forever` * If `WiFi is connected`, * If `get motion (triggered or not) at Pin P1` = `true` then, that’s say someone is near the door. 
Step 4. Send notification when someone pass by
* Snap `if statement` to block `forever` * If `WiFi is connected`, then snap `play tone Middle C for 1 beat` from `music` * Snap `show icon` from `basic` and select a `monster icon` * Snap `Send IFTTT event_name*…` from `IoT:bit` > `IoT Services`, input your event name `SendEmail` 
Step 5. Show smile icon when no one pass by
* Snap `show icon` into `Else`, and select icon `smile` * Snap `Pause` after `if statement` to the loop for 1 second delay for checking 
Full Solution
MakeCode: https://makecode.microbit.org/S25125-53311-95019-94178
Download the hex file:
Step 1
Go to [http://www.ifttt.com](http://www.ifttt.com), register an account and login to the platform
Step 2
On the top right menu, click “Create” > “Applets”
Step 3
* Select this
* Select Smarthon IoT
* Input Device ID and Event Name. (eg. Device ID: 0x55a842e3477a, Event Name: SendEmail)
* Click “Create trigger”
Step 4
Select “That” > Email > Email
Step 5
Select “Send me an email” , Input email title and body, then click “Create action”
## Result
## Think
Q2. How to distinguish suspicious people (e.g. password authentication)?
## IoT (IFTTT)
* For more details, please refer to Chapter 2: Send Email by IFTTT
When WiFi is connected, if there are any suspicious movement near the door, the buzzer will emit sound and an email will be sent to the house owner. Also, a monster icon will be shown on the micro:bit.
Q1. How to avoid sending duplicate emails? (tips: using variable)