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Saturday, February 25, 2012
Wednesday, February 22, 2012
MINI PROJECTS-RAIN ALARM USING NE 555
RAIN ALARM USING
NE 555
ABSTRACT
Rain alarm circuit is very useful if the rainy
season, the function of a series of rain this alarm is to remind us in case of
rain. In the circuit diagram is
controlled by the IC 555, which functions for the NE555 provides 1 Khz tone
through the speaker if the sensor exposed to rain. Water sensor images can be
seen in the picture, place the sensor at an angle of 30-45 degrees from the
ground. Global Water’s Water Level Alarm Sensor (WA600) is water solid state
sensors for detecting the presence of conductive solutions, such as water
spills, water tank levels, and drainage ponds. Water alarm sensor has two
stainless steel electrodes in the position at the desired point for the
detection of liquid. When liquid is detected, a relay close to the surface water and
the alarm signal can be used to sound an alarm or closing a switch inside a piece of remote
monitoring equipment. Relay outputs fully isolated and can handle 2 amps of
current.
The most
common mode in which the IC 555 can be configured is in the form of a
monostable multivibrator. In this mode the IC remains continuously in an alert
standby position. Its pin #2 may be integrated with different sensors to make
the circuit detect the relevant parameters and activate an alarm or a
countermeasure device connected to its output for averting the sensed danger.
The activated alarm may be wired to latch up permanently or switched ON for a
fixed predetermined period set by the external timing components. In the
monostable mode, the circuit may be rigged into some useful alarm circuits.
The first
circuit described is of a rain sensor which will produce an audible tone the
moment it comes in contact with water. Thus it may be used to detect the
commencement of rain, so that one may bring the valuable assets like a vehicle
or clothes under cover before they are drenched in heavy showers.
After the alarm
sensor water level in dry conditions, the detection sensor will automatically
reset without the need for additional services. Alarm surface rough and require minimal
maintenance. The Water Level Alarm has many uses, including: surface water monitoring, detection
precision, control water levels, an indication of high water, and sea submarine
low-level indication. Water alarm sensors can be purchased to trigger an alarm
on contact with water or air.
RAIN ALARM USING
NE 555
CIRCUIT DIAGRAM
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