Door Knock Alarm With Timer
Review: 5 - "A masterpiece of literature" by , written on May 4, 20020
Great

Door Knock Alarm With Timer

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  • Product SKU: LGKT044
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₹ 449 ₹ 549
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Highlights
  • Product Code: LGKT044
  • Technical Support: upto 30mins Video support
  • Handmade
  • Make in India
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Details
  • Unsoldered PCB and all components to be soldered on PCB.
  • Includes all ICs, Connecting wires and Sensors.
  • Documentation: PCB Specifications Component list and Circuit diagram.
  • Power Supply: No battery included, Includes 12 Volt DC adapter with the kit.
  • Video tutorial is available on YouTube.
  • One set of the readymade in working condition.
  • Includes all ICs, Connecting wires and Sensors.
  • Documentation: PCB Specifications Component list and Circuit diagram.
  • Power Supply: No battery included, Includes 12 Volt DC adapter with the kit.
  • Video tutorial is available on YouTube.

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Specification

Description

This Knocking Alarm With Timer uses the piezoelectric element of a piezo buzzer as the input sensor. The piezoelectric element plate is a patch at the center of the door wing by using cello tape. Apply a small quantity of adhesive at the edges between the plate and the door. The Alarm With Timer is designed with extending wires about 1-1.5 meters from the piezoelectric to the circuit. IC NE555 is configured in monostable mode.

When this Low-cost Timer Circuit gets an input pulse, its output goes high for a period set by the Variable resistor, resistor, and capacitor. IC UM66 is used as a melody generator. When the door is knocking at the pizza plate generates an input pulse, which is amplified by the transistor. The Door Knock Alarm's amplified signal triggers the timer IC NE555 and its output pin 3 goes high to enable the melody generator. After the set time period, the melody sound stops.


Block Diagram

Door-Knock-Alarm-With-Timer-block-diagram

Physical Attributes

  • Dimensions (cm) L x W x H : 20 x 15 x 5
  • Weight (gm): 200

Product Video

Customer Reviews

Based on 4 reviews
75%
(3)
25%
(1)
0%
(0)
0%
(0)
0%
(0)
U
Udbhav bhatia
prior knowledge

this kind of project requires a lot of prior knowledge to really understand the underlying principles.

A
Arun Kumar ghosh
good

Kit is goood and instraction is also good

A
Ajay Lengare
Fun Project

Really fun and huge kit.

s
swarup sardar
Kit is Very good

The kit is very good, but you need to learn a lot about ic , capasitor resistor and its capasity