Door Knock Alarm With Timer
- Product SKU: LGKT044
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DescriptionThis 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.
- Dimensions (cm) L x W x H : 20 x 15 x 5
- Weight (gm): 200
this kind of project requires a lot of prior knowledge to really understand the underlying principles.
Kit is goood and instraction is also good
Really fun and huge kit.
The kit is very good, but you need to learn a lot about ic , capasitor resistor and its capasity