sowinkumar namel a

Sowinkuma r Namel a/l Nag arajan (e e095367) Raneej a/l S ukumaran (ee09535 6) Section 4 Bench 05 ri!ge "oor #larm $roject $ro%o&al ' • About Fridge. A refrigerator (colloquially fridge) is a common household appliance that consists of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat f rom the inside of the fridge to its external environment so that the inside of the fridge is cooled to a temperature below the ambient temperature of the room. Refrigeration is an essential food storage technique in developed countries. he lower temperature lowers the reproduction rate of bacteria, so the refrigerator reduces the rate of spoilage. • !roblems hat are "sually faced with a fridge #ost of the common problem are faced by the society is the current bills. Refrigerator will used more electricity until it reaches it$s maximum coldness. %o, most of children or adult will used the refrigerator and forget to close the door. &t will conduct more electricity due to increase it$s coldness. his will increase the current bill of the house. o overcome this type of problem , we would li'e to introduce our refrigerator door alarm. • escription about the fridge system. his is a fridge door alarm circuit, which produces an audible alarm when fridge is left open for a preset time. his versatile alarm is based on two timer &*$ s. +oth &*s are wired as astable #ultivibrators. A n R is connected in parallel to the timing capacitor *- of &* -.hen door is completely close there will be no light inside the fridge and R offers high resistance 'eeping R- fully charged.hen door is left open ,the lamp inside the fridge will 'eep glowing ,R will be illuminated, and its resistance falls. his ma'es *- stop charging and starts to discharge ( &n simple words, this is because at low resistance R b ye passes much of the current in the parallel path and capacitor gets less current). /ow &* - starts slightly oscillati ng and after a preset time of 0 ( time -) seconds its output goes high. his out put ma'es the &c 0 to produce oscillations and results in a beeping sound for nex t 01(time 0) secon ds and cycle is repeated ti ll door is closed. Assemble the circuit on a good quality !*+ .ime - 2 0 can be ad3usted by varying *-, *0, R-, R4 etc (Refer data sheet of ).!lace the R close enough to the lamp inside the fridge. .

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8/18/2019 Sowinkumar Namel A

http://slidepdf.com/reader/full/sowinkumar-namel-a 1/2

Sowinkumar Namel a/l Nagarajan (ee095367)

Raneej a/l Sukumaran (ee095356)

Section 4

Bench 05

ri!ge "oor #larm $roject $ro%o&al '

• About Fridge.

A refrigerator (colloquially fridge) is a common household appliance that consists of a thermally

insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat fromthe inside of the fridge to its external environment so that the inside of the fridge is cooled to a

temperature below the ambient temperature of the room. Refrigeration is an essential food storage

technique in developed countries. he lower temperature lowers the reproduction rate of bacteria, so

the refrigerator reduces the rate of spoilage.

• !roblems hat are "sually faced with a fridge

#ost of the common problem are faced by the society is the current bills. Refrigerator will used

more electricity until it reaches it$s maximum coldness. %o, most of children or adult will used the

refrigerator and forget to close the door. &t will conduct more electricity due to increase it$s coldness.

his will increase the current bill of the house. o overcome this type of problem , we would li'e tointroduce our refrigerator door alarm.

• escription about the fridge system.

his is a fridge door alarm circuit, which produces an audible alarm when fridge is left open for a

preset time. his versatile alarm is based on two timer &*$s. +oth &*s are wired as astable

#ultivibrators. An R is connected in parallel to the timing capacitor *- of &* -.hen door is

completely close there will be no light inside the fridge and R offers high resistance 'eeping R-

fully charged.hen door is left open ,the lamp inside the fridge will 'eep glowing ,R will be

illuminated, and its resistance falls. his ma'es *- stop charging and starts to discharge ( &n simple

words, this is because at low resistance R bye passes much of the current in the parallel path andcapacitor gets less current). /ow &* - starts slightly oscillating and after a preset time of 0 ( time

-) seconds its output goes high. his out put ma'es the &c 0 to produce oscillations and results in a

beeping sound for next 01(time 0) seconds and cycle is repeated till door is closed.

Assemble the

circuit on a good quality !*+ .ime - 2 0 can be ad3usted by varying *-, *0, R-, R4 etc (Refer

data sheet of ).!lace the R close enough to the lamp inside the fridge.