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ConvertibleThreshold Temperature Audible alarm

2016-01-19 17:50  
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Temperature alarms can alert you to dangerous low temperatures or flooding conditions in a vacant property.When Rl increases as temp decreases, the output of IC1 goes positive, turning on Ql. Ql conducts and causes Q2 to conduct, turning on the audible alarm.The threshold is set with potentiometer  R2.Apotentiometeris a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value.
 

Adjustable threshold temperature alarm