Chimney Sentinel is remote fire alarm that can give a warning of fires caused by wood-burning appliances. The project uses a probe inserted in the chimney and a remote monitoring unit built based on PIC16F628. When a fire is detected, the device will sounds an alarm before smoke has time to reach other detectors within the home.
Additionally, it helps prevent fires by monitoring the conditions in the chimney. Creosote tends to build up in chimneys when the temperature in the flue is too low; this build-up can lead to a fire. The project detects when the flue temperature is in the danger range, and then sounds an alarm if the temperature does not move through the danger zone quickly enough. The monitor will continue sounding an alarm even if the heat is such that the sensor is destroyed (the melting point is in excess of 2500°F).