HOW to Make an Invasion Alarm with Kidspico

By r December 11th, 2024 778 views

Invasion alarm is a device that alarms when detecting illegal invasion in a prevention area. It plays a pivotal role in security prevention, so it is widely applied to family, stores, warehouses and supermarkets. Thus, our life can be better protected from illegal invasion. Meanwhile, our personal and property safety can also be guaranteed.

In this experiment, we adopt PIR motion sensor, power amplifier and a white LED to form an invasion alarm. When someone is detected, the white LED flashes and the amplifier alarms.

Flow

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Assembly

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Required Parts

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Step 1

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Step 2

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Step 3

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Step 4

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Step 5

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Step 6

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Step 7

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Completed

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Wiring Diagram

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Test Code

Open 4.2Invasion alarm.py in Files and click 1407 .

'''
 * Filename    : Smart Safe Home: Invasion Alarm
 * Thonny      : Thonny 4.1.4
 * Auther      : http//www.keyestudio.com
'''
from machine import Pin, PWM
import time

PIR = Pin(3, Pin.IN)
led = Pin(11, Pin.OUT)
trumpet = PWM(Pin(2))

while True:
    PIR_value = PIR.value()
    if PIR_value == 1:
        for i in range(6):
            trumpet.freq(880)
            trumpet.duty_u16(2000)
            led.on()
            time.sleep(0.5)
            trumpet.freq(523)
            trumpet.duty_u16(1000)
            led.off()
            time.sleep(0.5)
    else:
        trumpet.duty_u16(0)
        led.off()

Explanations

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Conceive:

When the sensor detects a human motion (an invasion), the LED flashes and the amplifier alarms. If it detects nothing, LED will go off and the amplifier will not emit sound.

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Code structure:

Initialization.

Set the pins of the PIR motion sensor, white LED module and the power amplifier.
Loop.

Read the power level of the board input from the PIR motion sensor.

Determine whether the power level is 1(indicates an invasion).
- If yes, the LED flashes and the amplifier alarms.
- If not, LED will go off and the amplifier will not emit sound.