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Fridge Alert System


Here is a simple circuit “Fridge Alert System” can be used in fridge, indicating whether the temperature is more than pre-defined temperature. The arrangement of the circuit fridge alert system showed here alert when temperature increased then 50C.

Thermistor TH1 is used as temperature sensor, change their resistance whenever changes in surrounding temperature. IC1 CL7611 combined with thermistor to complete all the process of temperature. IC2 is used here to indicate the status of battery. Glowing LED1 indicate temperature is more than 50C.

circuit diagram of fridge alert system

PARTS LIST

Resistors (all ¼-watt, ± 5% Carbon)

R1, R2 = 4.7 MΩ

R3 = 2.2 MΩ

R4 = 56 KΩ

R5 = 12 KΩ

R6 = 10 KΩ

R7 = 270 Ω

R8 = 390 Ω

Semiconductors

IC1 = CL7611

IC2 = 8211

T1 = 2TX300

LED1 = RED

LED2 = Green

Miscellaneous

SW1 = Push-to-on switch

TH1 = GL16 thermistor

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