Fire detector solution based on ATMEL ATTINY441-SSU

Principle of fire detector

Temperature-sensitive fire detectors (referred to as temperature sensors) mainly use thermal sensors to detect fires.

In the initial stage of the fire, a large amount of smoke is generated, and the substance releases a large amount of heat during the combustion process, so the ambient temperature rises sharply.

The thermal element in the detector undergoes a physical change, thereby converting the temperature signal into an electrical signal and performing an alarm process.

The introduction of ATTINY441-SSU

ATTINY441-SSU is 8-bit AVR Microcontroller with 4/8K Bytes In-System Programmable Flash.

ATtiny441 is a low-power CMOS 8-bit microcontrollers based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny441/841 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

The AVR core combines a rich instruction set with 32 general purpose working registers. All 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in a single instruction,executed in one clock cycle. The resulting architecture is compact and code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.

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ATtiny441/841 provides the following features:

 4K/8K bytes of in-system programmable Flash
 256/512 bytes of SRAM data memory
 256/512 bytes of EEPROM data memory
 12 general purpose I/O lines
 32 general purpose working registers
 One 8-bit timer/counter with two PWM channels
 Two 16-bit timer/counters with two PWM channels
 Internal and external interrupts
 One 10-bit ADC with 5 internal and 12 external channels
 One ultra-low power, programmable watchdog timer with internal oscillator
 Two programmable USARTs with start frame detection
 Slave Two-Wire Interface (TWI)
 Master/slave Serial Peripheral Interface (SPI)
 Calibrated 8MHz oscillator
 Calibrated 32kHz, ultra low power oscillator
 Four software selectable power saving modes.

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The block diagram of Fire detector based on ATMEL ATTINY441-SSU

The core advantages of the application solution:

1.low cost

2.Small package

This solution can be used to:

Fire detector market

Home security alarm