Basic Electronics/Electrical Projects & Kits

Get our latest collection of basic electronics projects here -- all tested and reviewed for use in mini projects and main projects or even just as hobbyist projects!
Remote Control for Home Appliances Save Rs. 50.00

Remote Control for Home Appliances

by KNS Pvt Ltd
Save Rs. 50.00
Rs. 325.00
Rs. 275.00

Summary

The Remote Control for Home Appliances can be used to switch ON and OFF any home appliance or electrical device with a single press of a TV/VCR/DVD remote control. This low-cost circuit is based on the CD4017 counter IC which receives trigger pulse from the IR sensor and switches ON the relay, through which electrical devices are switched ON. Upon receiving the 2nd pulse the device is switched OFF.

Get ready to control your home appliances from your TV Remote control and upgrade your home to a techie Palace!!

Learning

Things which you can learn:
*Application of the IR transmitter and receiver modules.
*Application of the decade counter IC CD4017.
*Use of relays to drive loads.
*Applications of Transistors as amplifiers

Product Description

The Remote Control for Home Appliances can be connected to many home appliances such as lamps, fans, radios, etc to make the appliance switch ON/OFF from a TV, VCR or DVD remote control. This circuit can be operated from upto 10 meters.

Working


The 38kHz infrared (IR) rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. The output signal (from pin3) is amplified by transistor T1 (BC558). This amplified signal is fed to the clock pin (pin no.14) of decade counter IC CD4017 (IC1), pin 3 of which is connected to a red LED (LED1). This LED glows to indicate that the appliance is OFF. The output (pin no.2) of IC1 is connected to a green LED (LED2) and is used to indicate the ON state of the appliance. Transistor BC548 (T2) is connected to pin 2 of IC1 and drives the relay RL1.

The appliance to be controlled is connected between the pole of the relay and neutral terminal of mains. It gets connected to live terminal of AC mains via normally opened (N/O) contact when the relay energizes.

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Electronic Watch Dog Save Rs. 50.00
Rs. 300.00
Rs. 250.00

Electronic Watch Dog

Electronic Watch Dog

by KNS Pvt Ltd
Save Rs. 50.00
Rs. 300.00
Rs. 250.00

Summary

The Electronic Watch Dog produces an alarm sound when a person crosses the gate. The circuit comprises a transmitter unit and a receiver unit, which are mounted face to face on opposite pillars/walls of the gate such that the IR beam gets interrupted when someone is standing at the gate or passing through it. When such a condition is detected, an alarm sound is generated for audible indication. No. of ICs used: 3

Learning

Things which you can learn:

*Application of IR transmitter and receiver.
*Application of the NE555 timer in the astable mode of operation.

Product Description

A simple circuit which acts as a Watch dog, informing the house owners about the forced or unauthorized entry.

Working

The transmitter end of the Electronic Watch Dog is built around the NE555 timer (IC1) which is wired as an astable multi-vibrator producing a frequency of about 38 kHz. The infrared (IR) beam is transmitted through IR LED1.

The receiver end of the circuit comprises of an IR sensor TSOP1738 (IR RX1), NPN transistor BC548 (T1), NE555 timer (IC2) and some resistors and capacitors. IC2 is wired as a monostable multi-vibrator with a time period of around 30 seconds. The melody generator section is built around the melody generator IC UM66 (IC3), transistor T2 and loudspeaker LS1. The transmitter and receiver units are aligned such that the IR beam falls directly on the IR sensor. As long as IR beam falls on the sensor, its output remains low, transistor T1 does not conduct and trigger pin2 of IC2 remains high. When anyone interrupts the IR beam falling on the sensor, its output goes high to drive transistor T1 into conduction and pin 2 of IC2 goes low momentarily. As a result, IC2 gets triggered and its pin3 goes high to supply 3.3V to melody generator IC3 at its pin 2, which produces a sweet melody through the speaker fitted inside the house. Output pin 3 of IC2 remains high for around 30 seconds. To achieve a high directionality of the IR beam towards the sensor, use a reflector behind the IR LED.

After both the units have been built, connect the 6V power supply to the receiver circuit. You should hear a continuous melody from the speaker. Now connect 6V power to the transmitter also and orient IR LED1 towards IR receiver. The melody should stop after about 30 seconds.Now the transmitter and the receiver units are ready for use. When somebody enters through the door, the IR beam is interrupted and the alarm sounds for 30 seconds. The alarm keeps sounding as long as one stands between the transmitter and receiver units. Using preset VR1, you can set the volume of the loudspeaker.

 

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Automatic Room Light Controller with Visitor Counter Save Rs. 301.00

Automatic Room Light Controller with Visitor Counter

by KNS Pvt Ltd
Save Rs. 301.00
Rs. 3,300.00
Rs. 2,999.00

This automatic room light controller project with visitor counter is a reliable circuit based on the AT89S52 microcontroller. It takes over the task of controlling room lights as well us counting the number of people in a room accurately. When somebody enters a room, the counter is incremented by one and the light in the room is switched 'ON' and when any one leaves the room, the counter is decremented by one. Light is only switched 'OFF' when all the people in the room go out.

The total number of people inside the room is also displayed on the seven segment display by the microcontroller. It receives signals from the sensors, and this signal is operated under the control of software stored in ROM. Microcontroller AT89S52 continuously monitors the Infrared receivers. When any object passes through IR receivers, the IR rays falling on the receivers are obstructed, this obstruction is sensed by the microcontroller

Brand: HBeonLabs, Product assembled by: HBeonLabs

 

 

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