Fire alarm

The fire alarm comprises a fire signal induction device, a fire signal alarm device and a flame-retardant shell. The fire alarm signal sensing device is composed of a flexible intelligent structure integrating driving and sensing and a Bluetooth transmitting module, and the flexible intelligent structure is composed of a membrane assembly and a copper wire; wherein the film assembly is composed offour layers of films, namely a humidity-sensitive material layer, a gold electrode film and a piezoelectric material P (VDF-TRFE) layer from top to bottom, the gold electrode film layer and the filmlayers are tightly connected with each other, a copper wire is adhered to the gold electrode film through silver glue, and the flexible intelligent structure converts temperature and humidity into electric signals and outputs the electric signals through the copper wire; the Bluetooth transmitting module is used for transmitting a fire alarm signal under a power-on condition; the fire alarm devicecomprises a microprocessor