## IOT Technology Applied:
You could also download the program from the following website:
## Step By Step Tutorial
* Connect the Motion sensor to P2. * Connect Distance Sensor to P14,P15. * Pull down the buzzer switch to connect the buzzer. 
1.2 Programming (MakeCode)
**Step 1. Disable the LED and initialize OLED** * Snap led enable false inside on start. * Snap initialize OLED with width 128 and height 64. 
**Step 2\. Set up the function warning** * Add a new function name warning. * Snap play tone Middle C for ½ beat until done. * Snap play tone High D for ½ beat until done. 
**Step 3\. Setup the function door\_detect** * Add a new function name door\_detect. * Snap if loop into the function. * Snap if Get distance unit cm trig P14 echo P15 \<10 or Get motion (triggered or not) at Pin P4 \= true into the if loop. * Then, snap show string “Theft: Yes” inside the if loop. * Snap call function warning inside the if loop. * Connect the button module to P2. * Connect the 180 degree servo to P6. 
**Step 4\. Call door\_detect function** * In block forever, snap clear OLED display. * Snap call door\_detect. * Snap pause for 1 second. 
Part 1 Solution:
MakeCode: [https://makecode.microbit.org/S83165-50446-71211-10149](https://makecode.microbit.org/S83165-50446-71211-10149)
You could also download the program from the following website:
Part 1 Result
When someone gets close to the door, either the distance sensor or motion sensor will detect it and warn alert to house owner. 
* Connect the two crocodile clip cables to P1 and GND. 
2.2 Programming (MakeCode)
**Step 1\. Setup function flooding** * Add a new function name flooding. * Snap show string join flood: pin P1 is pressed. * Snap pin P1 is pressed \= true as condition. * If in if segment, that's means the water was connected two clips. * Call warning function. 
**Step 2\. Call function flooding** * In forever, snap call function flooding. 
Part 2 Full Solution:
MakeCode: [https://makecode.microbit.org/S50805-91150-64544-90682](https://makecode.microbit.org/S50805-91150-64544-90682)
You could also download the program from the following website:
Part 2 Result
When the water level rises to the crocodile clip’s position, the warning sound is triggered to warn the user. 
* Connect the Light sensor to Pin P3. 
3.2 Programming (MakeCode)
**Step 1\. Initialize counter variable** * Create a “fridge” variable and set to 0\. 
**Step 2\. Setup function fridge\_detect** * Add a new function name fridge\_detect. * Snap show string join fridge light: Get light value (percentage) at Pin P3. * Snap if Get light value (percentage) at Pin P3 \>= 30\. * Add the counter with 1 by change counter by 1 to sum up the time of door opened. * Snap show string join Count: fridge. * Put the second if statement with counter \>= 60 condition to examine when should issue warning sound, snap show string fridge: open and call warning into the loop. * Back to the first if-else level, in the else segment, that's means light intensity is weak, door was closed, so reset the counter to 0 by set counter to 0\. 
**Step 3\. Call fridge\_detect function** * In block forever. Snap call fridge\_detect. 
Part 3 Full Solution:
MakeCode: [https://makecode.microbit.org/S37620-61148-23498-84097](https://makecode.microbit.org/S37620-61148-23498-84097)
You could also download the program from the following website:
Part 3 Result
When the door is opened for more than 1 minute, the buzzer will play some sound to warn the user. 
* Connect the button module to P2. * Connect the 180 degree servo to P6. 
4.2 Programming (MakeCode)
**Step 1\. Create variables** * In on start, create a variable called btnA, btnB, unlock. * Set btnA ,btnB to 0 and set unlock to false. 
**Step 2\. Monitoring the button pressing state and take action** * Snap the When Button at P2 pressed block to editor. * Put a if statement in the When Button at P2 pressed block. * Set the condition to unlock \= true. * When unlock \= true, that's means it is unlock successfully, the servo should open the door by Turn 180 servo to 180 degree at P6, after that, wait for 5 second by pause (ms) 5000, then close and lock the door again by Turn 180 servo to 70 degree at P6 and set variable unlock to false. 
**Step 3\. Set the password input method** * Snap on button A pressed to editor. * Use change btnA by 1 to increase the count variable by 1\. * Repeat the step with minor differences on target to let button B also can increase btnB. 
**Step 4\. password input method** * Snap on button A+B pressed to editor. * Put an if-else statement inside. * Use btnA \= 2 and btnB \= 3 as conditions, you may also change it to your favourite password. * In the if segment, that means the input is correct, set unlock to true to allow open the door when press the extended button. * In the else segment, that means the input is not correct, set unlock to false to deny open the door when press the extended button. * Reset the two count variable btnA and btnB to 0 for next input. 
Part 4 Full Solution:
MakeCode: [https://makecode.microbit.org/S14641-94865-24076-73126](https://makecode.microbit.org/S14641-94865-24076-73126)
You could also download the program from the following website:
Part 4 Result
After pressing the correct number of button A and B, press A+B to do the validation. If it is the correct password, press the extended button, the door will open. After 5 seconds, the door will close and lock again. If wrong, do not open the door. 
* Connect the flame sensor to P10. * Connect the Multi-Color LED to P7. 
5.2 IOT Setup (IFTTT)
* Go to https://ifttt.com/ , create applet (if webhooks then Notification) 
* Go to “My services” \> “Webhooks”, select “Documentation” . Copy your Webhooks Key as follows: 
**Optional: Use email as notification method** * In the THEN field, search for the “email” and use it to replace the “notifications” in the previous step. 
5.3 Programming (MakeCode)
**Step 1\. Connect to WiFi, create variable.** * 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. * Snap Set strip to NeoPixel at pin P7 with 1 leds as RGB(GRB format) 
**Step 2\. Show device\_ID after WiFi connection** * Snap show device\_ID from basic to On WiFi connected. 
**Step 3\. Setup the function Flame\_detect** * Add a new function name Flame\_detect. * Inside the function, put an if statement with condition Get flame detection at Pin P10 \= true to recognize the flame. * Inside the if loop, put an if statement with condition WiFi connected? to check the connection status. * Inside the if statement, Put a Send IFTTT key\* XXXXXXXXX event\_name\* XXXXX .... to send the event to IFTTT. Fill in the IFTTT key from your Webhooks and the Applet's event\_name (fire). * Outside the if wifi connected loop, snap show string Fire:detected, * Also, snap call warning into the first if loop . 
**Step 4\. Update the warning function** * In the function warning, snap strip show color red and strip show color black into the function. 
**Step 5\. Check the Upload result** * To check the upload state, use the On IFTTT Uploaded to get the sending result. * Inside the On IFTTT Uploaded, use OLED display to show the information. * Clear the OLED display before each update by clear OLED display. * Show upload state by show string join IFTTT: Status, the Status value is from the function's placeholder. 
**Step 6\. Call Fire\_detect** * In forever, call Fire\_detect. 
Part 5 Full Solution:
MakeCode: [https://makecode.microbit.org/S76339-94624-90471-31742](https://makecode.microbit.org/S76339-94624-90471-31742)
You could also download the program from the following website:
Part 5 Result:
When the flame source is detected by the flame sensor, it will trigger to blink the LED, making alert sound, and send the warning notification to IFTTT. 
