Schematic Diagram

Here is the circuit diagram of Remote Operated Home Appliances or Remote controlled Home appliances. Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD, VCR, Air Conditioner or DVD remote control. The circuit can be activated from up to 10 meters. It is very easy to build and can be assembled on a veroboard or a general-purpose PCB.

Circuit diagram:


Parts:

R1 = 220K
R2 = 330R
R3 = 1K
R4 = 330R
R5 = 47R
C1 = 100uF-16V
C2 = 100nF-63V
C3 = 470uF-16V
D1 = 1N4007
D2 = Red LED
D3 = Green LED
Q1 = BC558
Q2 = BC548
IR = TSOP1738
IC1 = CD4017
RL1 = Relay 5V DC

Circuit Operation:
The 38kHz infrared rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. Pin 1 of TSOP1738 is connected to ground, pin 2 is connected to the power supply through R5 and the output is taken from pin 3. The output signal is amplified by Q1. The amplified signal is fed to clock pin 14 of decade counter IC CD4017 (IC1). Pin 8 of IC1 is grounded, pin 16 is connected to vcc and pin 3 is connected to D2 (Red LED), which glows to indicate that the appliance is ‘off.’

The output of IC1 is taken from its pin 2. D3 connected to pin 2 is used to indicate the ‘on’ state of the appliance. Q2 connected to pin 2 of IC1 drives relay RL1. D1 acts as a freewheeling diode. 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. If you want to operate a DC 12 volt relay then use a regulated DC 12 volt power supply for DC 12 volt Relay and remember that the circuit voltage not be exceeded more than DC 5 volte.

Car alarm is an electronic device installed in a vehicle (car, truck, boat, motorcycle) in an attempt to discourage theft of the vehicle itself, its contents, or both. Alarms work by emitting high-volume sounds (usually a siren, Klaxon, pre-recorded verbal warning, the vehicles own horn, or a combination thereof) when the conditions necessary for triggering are met, as well as by flashing some of the vehicles lights, and (optionally) notifying the cars owner via a paging system and interrupting various electrical circuits necessary for the car to start.

Many Poeple get confused between an alarm and immobilizer. An immobilizer is an electronic device fitted to an automobile which prevents the engine from running unless the correct key (or other token) is present. This prevents the car from being "hot wired" after entry has been achieved.

Car Alarm Advantages:

Having an expensive aftermarket system in a car without an alarm is asking for trouble. Ive heard too many stories of people learning the hard way and losing a lot of money when they find out that their aftermarket audio system was not covered by their insurance. Car alarms may not be able to stop the thief but they do attract a lot of attention to the thiefs activities. Besides having an alarm system, here are a few other pieces of advice to keep your systems in a safe place.

* Dont drive through neighborhoods blasting the bass and calling attention to your system. Not only is this a courtesy to the residents but it also keeps the local hoods from scoping your ride as their next target.

* When parking your vehicle, try to park under lights and in an area where it is not hidden from view. Keeping it in the open reduces your chance of a thief breaking in to it. Thieves hate to be seen.

* Try to keep areas within the vehicle looking as stock or stealth as possible. Large aftermarket grilles are a nice advertisement that you have more than OEM equipment. Try to concentrate style in areas that are hidden from the exterior view, such as in the trunk.

Car Alarm Types:

There are two main types of car alarm activation methods. Passive and active. Passive alarms automatically enter an armed state after the ignition is turned off and the last door is closed. Active alarms require the user to press the transmitter button to arm and disarm the system. If you set your alarm to arm passively you can probably get a discount on your insurance. Check with your insurance provider. You may get a discount either way. Most good alarm systems can be configured as passive or active arming.

An alarm system should be put in at the same time or before a stereo system is put in. By waiting until after the system is in you run the risk of having it stolen before the alarm is installed.When shopping for an alarm, dont be cheap. A good quality unit can be purchased for about a hundred dollars if you shop around. For two hundred dollars you should get an alarm with some extensive features built in. Installation for the car alarm will run about one hundred dollars and up depending on how many extra features that you want hooked up and how fancy you want the installation to look. Keep the appearance on at least the same level as the stereo system, especially if you plan on competing in car sound off competitions.

If you want to install your own car alarm or remote car starters, make sure you read the manual carefully.

Car Alarm Features:

There are probably more features available on a car alarm than any other single category of equipment available for your system. There are new features constantly popping up on the market. Here are some of the most common.

Active Re-arm: After the alarm has been disarmed the system will automatically re-arm after a specified amount of time if a door is not opened. This is to prevent accidental disarming by the remote transmitter.

Air Horns: These are used on the interior or exterior to call more attention and cause pain to the thief if he makes it into the interior of the vehicle.Anti-Code Grabbing: A method employed to change the alarm code with every arm/disarm. The purpose of which is to defeat code grabbing equipment that can capture and resend your code to disarm the alarm at the thiefs leisure.