Configuration 3: Fire and flood alarm with WiFi communication

Subsystems
Microcontroller
Battery System (non-rechargeable)
Thermistor Circuit
Moisture/Contact Sensor
Siren
Push-button
WiFi Module
Approximate build cost
US$10, ZAR150
Operation
The moisture spike is pushed into the ground or placed in a position where it will get wet when flooding occurs.
The unit itself must be mounted near the area where fire is to be used but not directly above normal cooking areas.
The siren will sound and the unit will send out a message over the WiFi network to which it is connected when a flood or a fire situation is detected.
In the case of a fire a red light will also be illuminated. To stop the siren, press the button on the edge of the unit.
The moisture probe may need to be dried off to prevent the siren from going off again if it is wet.
WiFi networks need to be configured with a network name and password. In addition, the email address to which alerts must be sent is needed. These are entered by holding the button in for ten seconds. A WiFi network called Sigthsense will then be activated. Logging into this network will allow a user to set up credentials and an email address for alerts.
It is suggested that the WiFi connection be tested by dipping the moisture probe into water.
Because the system consumes very little power a non-rechargeable battery will suffice for many years of maintenance-free operation. Depending which battery option is chosen and how often the alarm is triggered a lifespan of ten years may be realised.

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