Micro:bit wifi security system

Last updated July 06, 2026

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step 1 - building

Getting Started

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This project is for kids

do you need a cookie watcher or a make sure your hidden stash of candy is safe?

well WSS:bit is here for the job!

items you need:

Elecfreaks micro:bit iot kit

ELECFREAKS Smart Science IoT Kit is developed based on IOT:bit, a new breakout board compatible with science sensors such as the ultrasonic sensor, dust sensor, light sensor, and water level sensor, including RTC Timing and WIFI module. You can gather data via the sensors and send data to the cloud with a more stable and accurate data analysis.

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and tape or twisty ties

Premium Female/Female Jumper Wires - 40 x 3" (75mm)

Handy for making wire harnesses or jumpering between headers on PCB's. These premium jumper wires are 3" (75mm)...

Out of Stock

Buzzer 5V - Breadboard friendly

Hey want to hear a really loud noise? Apply 3V to 5V to this buzzer module and you'll be rewarded with a loud 2KHz...

$0.95 each

In Stock

Add to Cart

step 1 - building

Ok, first take your iot:bit

connect the motion sensor and the sonar board

ok now it is time to code! open makecode microbit make a new project and put in this code

Download micro-bit

Copy Code

ESP8266_IoT.iotSwitchEvent(ESP8266_IoT.SmartIotSwitchState.off, function () {
    watch_mode = false
    can_beep = false
})
ESP8266_IoT.iotSwitchEvent(ESP8266_IoT.SmartIotSwitchState.on, function () {
    watch_mode = true
    can_beep = true
})
let watch_mode = false
let can_beep = false
let beeper_at_pin = 0
let other_items = false // set this to true if you added OLED and beeper
ESP8266_IoT.initWIFI(SerialPin.P8, SerialPin.P12, BaudRate.BaudRate115200)
ESP8266_IoT.connectWifi("your_ssid", "your_pwd") // enter your wifi name and pw
ESP8266_IoT.connectSmartiot("", "") // connecting to smartiot
if (other_items) { //OLED and the beeper
    OLED.init(128, 64)
    beeper_at_pin = 4
    can_beep = true
}
watch_mode = true
basic.forever(function () {
    if (watch_mode) {
        if (Environment.PIR(DigitalPin.P1)) {
            ESP8266_IoT.setSmartIotUploadData(
            10
            )
            basic.showLeds(`
                . . # . .
                . . # . .
                . . # . .
                . . . . .
                . . # . .
                `)
            basic.showIcon(IconNames.Angry)
            flexFX.playFlexFX(flexFX.builtInFlexFX(flexFX.BuiltInFlexFX.Siren), true)
            if (other_items) {
                OLED.writeStringNewLine("YOU GET OUT")
                if (can_beep) {
                    pins.digitalWritePin(beeper_at_pin, 1)
                } else {
                    pins.digitalWritePin(beeper_at_pin, 0)
                }
            }
        } else {
            basic.showIcon(IconNames.Heart)
            basic.showIcon(IconNames.Heart)
            basic.showIcon(IconNames.SmallHeart)
            basic.showIcon(IconNames.SmallHeart)
        }
    }
})

ESP8266_IoT.iotSwitchEvent(ESP8266_IoT.SmartIotSwitchState.off, function () {
    watch_mode = false
    can_beep = false
})
ESP8266_IoT.iotSwitchEvent(ESP8266_IoT.SmartIotSwitchState.on, function () {
    watch_mode = true
    can_beep = true
})
let watch_mode = false
let can_beep = false
let beeper_at_pin = 0
let other_items = false // set this to true if you added OLED and beeper
ESP8266_IoT.initWIFI(SerialPin.P8, SerialPin.P12, BaudRate.BaudRate115200)
ESP8266_IoT.connectWifi("your_ssid", "your_pwd") // enter your wifi name and pw
ESP8266_IoT.connectSmartiot("", "") // connecting to smartiot
if (other_items) { //OLED and the beeper
    OLED.init(128, 64)
    beeper_at_pin = 4
    can_beep = true
}
watch_mode = true
basic.forever(function () {
    if (watch_mode) {
        if (Environment.PIR(DigitalPin.P1)) {
            ESP8266_IoT.setSmartIotUploadData(
            10
            )
            basic.showLeds(`
                . . # . .
                . . # . .
                . . # . .
                . . . . .
                . . # . .
                `)
            basic.showIcon(IconNames.Angry)
            flexFX.playFlexFX(flexFX.builtInFlexFX(flexFX.BuiltInFlexFX.Siren), true)
            if (other_items) {
                OLED.writeStringNewLine("YOU GET OUT")
                if (can_beep) {
                    pins.digitalWritePin(beeper_at_pin, 1)
                } else {
                    pins.digitalWritePin(beeper_at_pin, 0)
                }
            }
        } else {
            basic.showIcon(IconNames.Heart)
            basic.showIcon(IconNames.Heart)
            basic.showIcon(IconNames.SmallHeart)
            basic.showIcon(IconNames.SmallHeart)
        }
    }
})

plug in micro:bit to computer

now if you use chrome or fire fox or some thing that webusb works on click download and follow what it says

if using safari click download it should go to your downloads drag the hex file in to the MICROBIT drive and there your done!

if you want to add other items like the beeper and oled you can

for oled plug the pins in to the black thing in below the microbit holder

now for the beeper take two female to female wires(one black and one yellow) and connect one end of the yellow wire to the beeper + and connect the other end to the yellow pin on port 4 on the iot:bit now get your black wire connect one end to beeper - and the other end to port 4 black pin and there your done!

and your done go have fun drive people nut keep that candy safe!

This page (Micro:bit wifi security system ) was last updated on July 06, 2026.