INDUSTRY SAFETY MEASUREMENT SYSTEM WITH SENSORS AND VOICE ANNOUNCEMENT

Block diagram:

SMOKE SENSOR

POWER LEAKAGE DETECTER

INTERFACING CIRCUIT

INTERFACING CIRCUIT

MICRO-CONTROLLER

[PIC 16F72]

VOICE PLAYBACK

IC[APR9600]

AMPLIFIER&

SPEAKER

SYNOPSIS

Nowadays fire accidents and power leakage are the common problem in all kind

companies and industries. This is happen accidentally or by human errors. Due to the lack

of fire detecting and control equipments some times small flame will create a worst

disaster. Mostly fire accidents are happened at night time because lack of man power and

warning system. So we needed to develop a system that must automatically control the

fire and must detect the power leakage give warning signal and voice announcement.

Here we develop such a system named “industry safety measurement system with

sensors and voice announcement”. If this system detects the fire or power leakage it

automatically activates the fire extinguisher and announce through loud speaker.

Here the fire is sense by using fire sensor so the reliability and accuracy is high.

The voice playback IC used here is APR9600. This IC can record up to 60sec of speech.

We can randomly access the stored information. This system is very useful at night time.

The variable parameters are sensed by using suitable sensors and processed by using a

microcontroller and displayed.

Normally the microcontrollers have own execution time. For example the

microcontroller source code for monitoring a speed will take at least 50msec. but in

between the time, the microcontroller may do another work. So the accuracy will be

more. If we are going to monitor multiple parameters, the microcontroller will support

multitasking. There will be a chance for noise intrusion in the system, when we are using

both microcontrollers.

A smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible or visual alarm from the detector itself.

Smoke detectors are typically housed in a disk-shaped plastic enclosure about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but the shape can vary by manufacturer or product line. Most smoke detectors work either by optical detection (photoelectric) or by physical process (ionization), while others use both detection methods to increase sensitivity to smoke. Sensitive alarms can be used to detect, and thus deter, smoking in areas where it is banned such as toilets and schools. Smoke detectors in large commercial, industrial, and residential buildings are usually powered by a central fire alarm system, which is powered by the building power with a battery backup. However, in many single family detached and smaller multiple family housings, a smoke alarm is often powered only by a single disposable battery.

VOICE RECORDING AND PLAYBACK using APR9600 ChipDigital voice processing chips withdifferent features and coding techniquesfor speech compression andprocessing are available on the marketfrom a number of semiconductor manufacturers.Advanced chips such as Texasinstruments’ TMS320C31 can implementvarious voice-processing algorithms includingcode-excited linear prediction, adaptivedifferential pulse-code modulation, A law(specified by California Council for InternationalTrade), μ law (specified by BellTelephone) and vector sum-excited linearprediction.On the other hand, APR9600 singlechipvoice recorder and playback devicefrom Aplus Integrated Circuits Fig. 1 shows the functional blockdiagram of IC APR9600. Complete chipmanagement is accomplished throughthe device control and message controlblocks.Voice signal from the microphone (seeFig. 2) is fed into the chip through a differentialamplifier. It is further amplifiedby connecting Ana_Out (pin 21) to Ana_In(pin 20) via an externalDC blocking capacitor C1.A bias signal is applied tothe microphone and to savepower during playback, theground return of this biasnetwork can be connectedto the normally open sideof the record switch. BothMic.in and Mic.Ref (pins 18and 19) must be coupled touse of a proprietary analogue storagetechnique implemented using flash nonvolatilememory process in which each cellis capable of storing up to 256 voltage levels.This technology enables the APR9600to reproduce voice signals in their naturalform.The APR9600 is a good standalonevoice recorder or playback IC with nonvolatilestorage and playback capability for32 to 60 seconds.

It can record and playmultiple messages at random or in sequentialmode. The user can select sample rateswith consequent quality and recordingtime trade-off. Microphone amplifier, automaticgain control (AGC) circuits, internalanti-