Generally, appliances used in our home are controlled with the help of switches. These days, you can see automation of these appliances using many technologies. This article presents the controlling of home appliances using DTMF technology. DTMF is acronym for Dual Tone Multi Frequency. So, just think when you make call for customer care, they will […]
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Temperature sensors are widely used in electronic equipments to display the temperature. You can see the digital clock displaying the room temperature value. It is due to the temperature sensor embedded in it. Generally, temperature value is analog. It is converted to digital value and then it is displayed. This article describes the same converting
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Attendance in colleges is generally paper based which may sometimes cause errors. Taking attendance manually consumes more time. So the proposed attendance system uses RFID technology to take attendance. In this system, each student is issued an RFID tag. Controlling unit is in the institute. Whenever the card is placed near the reader, it will
RFID Based Attendance System – Circuit, Working, Source Code Read More »
Biometrics is the emerging technology used for identification. Biometric refers to automatic identification of a person based on biological characters such as finger print, iris, facial recognition, etc. In this article finger print based attendance system is proposed. Attendance in educational institutions, industries will require more paper work and time. To reduce this, automatic attendance
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This project uses a Dallas DS1621 temperature sensor which indicates the temparature of the device. The temperature sensor has an thermal alarm output, which becomes high when the temperature of the device exceeds a user defined value. When the temperature drops below a user defined value, the alarm output becomes low. In this way any
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A photocell or photo resistor is a Light Dependent Resistors (LDR). LDR’s are sensors that detect light. They are small, inexpensive, low-power, easy to use and don’t wear out. Overview A photocell or photo resistor is a Light Dependent Resistors (LDR). LDR’s are sensors that detect light. They are small, inexpensive, low-power, easy to use
his electronic cricket is a fun project. A real crickets chirp at night and faster in warmer temperatures. A cricket chirp is composed of a group of three sinus waves of a single frequence of about 5kHz. occurring in rapid succession. Introduction This electronic cricket is a fun project. A real crickets chirp at night and
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Fastest Finger first circuit is basically used in quiz type games where the reaction speed of a participant is significant. The circuit enables us to identify who responded first to the question by triggering a visual and audio indication. Components Required 1 x ATMega16 development board 1 x Seven Segment display 8 x 330 ohms
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Introduction It can be quite tricky to reuse lithium-ion batteries from discarded equipment since these cells are often charged inside the equipment. In other words, there is no separate charger that can be reused. Fortunately, it turns out to be fairly easy to build a charger for used (or new) lithium-ion cells. Like most people,
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This is a simple TRIAC AC load dimmer used to control the power of a resistive load such as incandescent lamp or heater element. The max load it can handle is 400VA. Such a circuit is often found on cheap commercial light dimmers and is prooven to work reliable for the rated power. The circuit
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