Rainbow Display. Start Up Project 25


10AYou can make a beautiful Rainbow display to decorate your show case to give a “Visual Treat “to the visitors. It emits all the colours of the Rainbow (VIBGYOR) one by one and finally flashes rapidly. This is a kind of simple “Mood Lamp” to elevate the mind of viewers. You can fix it in an empty Jam pot so that it appears like a “Rainbow pillar”. A Multi colour Flashing LED and Glue stick can do this Magic. Multicolour LED has three chips to generate Red, Blue and Green (RBG LED) lights. Due to the fast transition of colours from one to another, the colour mixes and gives the Rainbow display. The Glue stick commonly used with the Glue gun transmits this light to its entire length giving a good visual effect. So try it, you need only Rs.25 for this.
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Panic Button. Home Utility Circuit 23


panic-button-2This Panic Alarm helps old aged people and those who are in bed rest to catch the attention of others in case of an emergency . It generates a loud Ambulance Siren when its Button is pressed. It can also be used as a Personal alarm during travelling. If there is any threat or emergency situation, it can help you to invite the attention of others. It is too compact ,handy , battery operated and can be kept in the bag or pocket. Its cost is just Rs.80 including battery.
Designed and developed by D.Mohankumar
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PIR Sensor Module. Component Guide 2


PIR-2 PIR Sensor Module is one of the new introductions in electronics which is a highly useful device to switch on lights when it detects a human movement. It turns on the lights from 30 seconds to 3 minutes depending on the preset adjustments. Its range can be as high as ten meters which can also be adjusted. The module gives a high output when it detects the human movement. This high output can be used to drive a relay through a switching transistor. Let us see the details of PIR sensor module.
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Radiation Sensor. Simple Design 27


RADIATION-SENSOR-2

This circuit tells you how much radiation is coming from electric devices. It picks up the AC hum from the surroundings of electric equipment and electric wiring and blinks the LED to show the radiation level. You can also use this to assess the safe distance from Computer radiation.
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How to reduce power consumption in Fridge


FRIDGE

The only electrical appliance that is switched on continuously is the Fridge and it takes around 50% of the total current consumed in a day. That means, if your daily consumption is 4 units, the Fridge alone takes 2 units. Even the most modern Energy Star type consumes 1.5 units in a day. You can check this easily. Note the meter reading and take another reading after 24 hours. The difference is the Units in a day. Then unplug the Fridge for one day and use other devices as usual. Take the reading after 24 hours. You can see how much unit is consumed by the Fridge in a day. If it is more than 2 units, it is time to replace the Fridge. So to reduce the electricity bill, the only way is to monitor the Fridge. A 10 year old Fridge consumes double power than a new one. By doing some tricks, we can save around 0.5 units per day.
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Panic Button can help you in Emergency


CAR-REMOTE

If you have a car remote for key less entry, it can help you in emergency situations. It helps you just like a security person in night if there is an attempt of theft, threatening or an illness that requires emergency attention. Lock the car and keep the key with remote near the bed. Just inform the neighbours about this so that if the alarm sounds they can realize the situation. It is very useful in Flats and if the security person notices the activation of a particular car alarm, he will be alerted. This is highly useful both day and night ,if you are alone in the home .
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Bluetooth .How Stuff Works


Bluetooth is the miniature wireless transmitter and receiver used as an interface to access LANs, PSTN, Mobile network and portable handheld devices. Bluetooth can communicate with the Bluetooth enabled devices through a short range network called ”Piconets”. When the Bluetooth enabled device enters the proximity of the piconet, it establishes connection with the Bluetooth. It is very useful for hands free communication in hand held devices. The technology of Bluetooth was named after Harald Blaatand Bluetooth II, the king of Denmark.

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