IR Light Dimmer v.1 circuit schematic with explanation

IR Light Dimmer v.1
This is a device for adjusting lights in your home with any type of remote controller (tv, dvd, video,…). Today we are using many devices in our homes to improve quality of our life and this is another example on how you can enhance a simple procedure like switching the lights ON/OFF. It may be difficult to many of us to stand up from our chair only to switch lights, so try imagining yourself doing this with your remote controller.



http://www.electronics-lab.com/projects/motor_light/044/index.html

Projects/IR light dimmer v1

Projects/IR light dimmer v1
This is a very simple IR light dimmer that you will wish to have sooner or later, especially those who are lazy enough to get up and turn off the lights. There are two versions of PCB for two sizes of capacitors, so PCBs are: 32.5 x 26.5mm and 28.5 x 27mm.

Features of current beta version of firmware:
- Soft start (gradually turning on the light bulb)
- Soft down (gradually turning off the light bulb)
- Learning IR codes from RC5 and NEC remotes
- Dimming in 10 levels by using only IR remote
- Previous dimm-level remembering when operating with remote
- Sleep timer in duration of 1.6min for 60Hz version and 2min for 50Hz version
- ON/OFF control with wall pushbutton

http://www.elektronika.ba/617/ir-light-dimmer-v1

IC 741 based Bar graph light meter

If you want simple meter the intensity of the light in a simple way. This circuit is very interesting, because with a LED display with 5 levels.The main equipment is uA741 the most popular op-amp circuit, to used the photo transistor is a device for receiver a lighting to change is electricity very low. We use IC1 acts boost up current, or to compare the voltage levels.The VR1 adjusts the offset voltage to the LED display complete , the intensity of light to measure.The power supply size use +9 V and -9V.

Using IC 741 for Audible light sensor

This is audible light sensor circuit that is based the IC741 op-amp IC. This circuit light sensor one,these are use two LDRs for detector lower lightly.
The 741 is pulse oscillator generator output to small speaker. The VR1 have value 50k acts as to fine sensitivity of light sensor. The speaker use small size only because output has low current.

S:eleccircuit.com

Night Light based on photocell

Description.

Many automatic night light circuits had been published here. This one uses a photocell for detecting the light intensity. At full light the resistance of the photocell will be few ten ohms and at darkness it will rise to several hundred ohms. The IC1 uA741 is wired as a comparator here. At darkness the resistance of photocell increases and so the voltage at the inverting input of the IC1 will be less than the reference voltage at the non inverting input. The output of the IC1 goes to positive saturation and it switches ON the transistor to activate the relay. By this way the lamp connected through the relay contact glows. The diode D1 works as a freewheeling diode.

• The circuit can be assembled on a Vero board.
• Use 9V DC for powering the circuit.
• POT R7 can be used to adjust the sensitivity of the circuit.
• The relay K1 can be a 9V, 200 Ohm SPDT type.
• L1 can be a 230V,60W lamp.
• R8 can be a ORP 12 photocell.

CMOS IC 4060 based night security light

Here is a simple circuit switches on a light around 2 hours after midnight, the time at which most of the robberies taking place.

This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and keeps the pin 12 of the IC1 high, preventing the IC1 from oscillating. When it is dark the LDR resistance becomes high and the pin 12 of IC1 becomes low and the IC starts oscillating, which indicated by the flashing of LED D3.The values of the timing components R1, R2, C4 are so selected that the out put pin3 of IC1 goes high after 8 hours. That means the high output drives the triac to switch on the lamp around 2’O clock. At morning, the LDR resistance drops and the pin 12 of IC1 goes high and stops the oscillation, making the lamp OFF. The switch S1 can be used to manually ON the lamp. The capacitor C2 prevents false triggering.

• Assemble the circuit on a good quality PCB or common board.
• The LDR can be general purpose LDR.
• The light sensitivity can be adjusted using the preset R6.
• The IC1 must be mounted on an IC holder.

S:circuitstoday.com

based on NE555 (IC1) & CD4017 (IC2) Dancing Light circuit

Here is a simple dancing light circuit based on NE555 (IC1) & CD4017 (IC2) .The IC1 is wired as an astable multivibrator to provide the clock pulses for the CD4017.For each clock pulse receiving at the clock input (pin14) of IC CD4017, the outputs Q0 to Q9 (refer pin diagram of CD 401) becomes high one by one alternatively.The LEDs connected to these pins glow in the same fashion to give a dancing effect.The speed of the dancing LEDs depend on the frequency of the clock pulses generated by the IC1.

• Assemble the circuit on a good quality PCB or common board.
• The ICs must be mounted on holders.
• The speed of the dancing LEDs can be adjusted by varying POT R2.
• The capacitor C1 must be rated 15V.
• Using different color LEDs could produce a better visual effect.

CD 4017 Pin configuration:
S:circuitstoday.com

control lights from two different nodes or locations through 3-Way Wires Switch Circuits

This page describes how to use 3-Way Wires Switch Circuits Diagram to control lights from two different nodes or locations.

A light or lights can be controlled by more than one switch. The usual practice in home construction is to use 3-way switches. “3-way” is the electrician’s designation for a single pole double throw switch.

The switches must create a complete circuit for current to flow and the bulb to light. When both switches are up, the circuit is complete (top right). When both switches are down, the circuit is complete (bottom right). If one switch is up and one is down, the current reaches a dead end, no current flows and the bulb is off (top left and bottom left).

Note that the above color scheme does NOT reflect wire color. It is functional coloring intended to illustrate the voltage state of each wire segment.

• Red indicates a hot wire (120 volts ac).
• Green indicates a neutral wire at ground potential.
• Blue indicates a wire that is floating. “Floating” here means isolated from hot and neutral by switches and/or light bulbs.

S:electronicsuite.com

christmass LED Lighting

Transistors T1 and T2 are configured as an astable multivibrator, which means one of the two transistors is always conducting. Thus the combination produces clock pulses. The values of time-constants formed with R6-C2 and R8-C1 pairs have been selected to produce a low frequency clock that is visible to human eye. The collectors of transistors T1 and T2 are connected to driver transistors T3 and T4. These are used to light up two rows of LEDs connected in parallel with alternate clock pulses. The frequency at which LED1 through LED9, and LED10 through LED18, alternately light up is about 2 Hz. You can easily change this frequency by changing the values of capacitors C2 and C1.

Resistors R2 and R4 are used to set the current through the LEDs. Red (LED1 through LED9) and green LEDs (LED10 through LED18) are used for simulating Christmas decoration effects. For the brightness variation, you can change the values of resistors R2 and R4.

S:electronicsuite.com

Basic Discrete Multistage Light Sequencer circuit

This is Discrete Multistage Light Sequencer circuit. Assume the circuit doesn’t start when power is applied and all lights are off and all three capacitors are charged to about 5 volts. We connect a jumper across the 220uF capacitor on the left which discharges the capacitor and turns on the 2nd stage transistor and corresponding light. When the jumper is removed, the capacitor will start charging through the base of the stage 2 transistor and stage 1 light. This causes the stage 2 transistor to remain on while the capacitor continues to charge. At the same time, the capacitor connecting stage 2 and 3 will discharge through the 100 ohm resistor and diode and stage 2 transistor. When the capacitor charging current falls below what is needed to keep stage 2 turned on, the transistor and light will turn off causing the voltage at the collector of the stage 2 transistor to rise to 5 volts. Since the capacitor connecting stage 2 and 3 has discharged and the voltage rises at the collector of stage 2, the capacitor from stage 2 and 3 will charge causing the 3rd stage to turn on and the cycle repeats for sucessive stages 4,5,6,7…. and back to 1. The sequence rate is determined by the capacitor and resistor values (220uF and 100 ohms in this case), load current (200mA in this case), and current gain of the particular transistor used. This arrangement runs at about 120 complete cycles per minute for 3 lights, or about 167mS per light. Faster or slower rates can be obtained with different capacitor values.

LDR and 2N2926 based light sensitive switch

This Light Sensitive Switch with LDR + 2N2926 circuit warn when be become dark, or Light sensitive switch.

By use electronics part the base is important , be the transistor 2N2926 and AC128.

For the light sensor also LDR (light dependent resistor) or a resister quickly the light.

When have no the light makes Q1 , stop work. The Q2 and Q3 then work, it then send current give buzzer utter loud immediately.

By circuit arrangement of Q1,Q2 be the character of Schmitt trigger help testify modify analog signal to digital 2 the level well. And help decrease the condition disturbs all with.

S:electronicsuite.com

circuit uses an LDR to sense the light(in auto street light)

The Auto Street Light using LDR circuit diagram present here is that of a street light that automatically switches ON when the night falls and turns OFF when the sun rises. In fact you can this circuit for implementing any type of automatic night light.

The circuit uses an LDR to sense the light .When there is light the resistance of LDR will be low.So the voltage drop across POT R2 will be high.This keeps the transistor Q1 ON.The collector of Q1(BC107) is coupled to base of Q2(SL100).So Q2 will be OFF and so do the relay.The bulb will remain OFF.

When night falls the resistance of LDR increases to make the voltage across the POT R2 to decrease below 0.6V.This makes transistor Q1 OFF which in turn makes Q2 ON. The relay will be energized and the bulb will glow.

S:electronicsuite.com

6 volt/5 watt solar panels using portable Solar Lantern

This Portable Solar Lantern circuit uses 6 volt/5 watt solar panels are now widely available. With the help of such a photo-voltaic panel we can construct an economical, simple but efficient and truly portable solar lantern unit. Next important component required is a high power (1watt) white LED module.

When solar panel is well exposed to sunlight, about 9 volt dc available from the panel can be used to recharge a 4.8 volt /600 mAh rated Ni-Cd battery pack. Here red LED (D2) functions as a charging process indicator with the help of resistor R1. Resistor R2 regulates the charging current flow to near 150mA.

Assuming a 4-5 hour sunlight day, the solar panel (150mA current set by the charge controller resistor R2) will pump about 600 – 750 mAh into the battery pack. When power switch S1 is turned on, dc supply from the Ni-Cd battery pack is extended to the white LED (D3). Resistor R3 determines the LED current. Capacitor C1 works as a buffer.

Note: After construction, slightly change the values of R1,R2 and R3 up/down by trial&error method, if necessary.

S:electronicsuite.com

Simple Motion Sensor Outdoor Lighting and Switch Circuit

Explanation:

Motion sensors can be interpreted independently represents a measure of change in motion that can be a vector and / or velocity of an object or an object in a field of view where there is a physical interaction between mechanical equipment with a field of view. From this point, we will determine what the desired outcome interaction. What about Motion sensor outdoor lighting?

Halogen Motion Sensor Outdoor Lighting

I am sure, that depart from our understanding of the motion sensor. Motion sensor outdoor lighting gives an indication to us that there is an interaction between a motion sensor to a situation out there where the activation of a light beam is expected.

Motion Sensor Outdoor Lighting is very useful for those requiring a light beam. This motion sensor can be used as a light alarm that can give a surprise to people who are not invited to that are in your yard.

Even the motion sensor outdoor lighting will help you when to go home at night, carrying a lot of shopping items in your hands, with low light conditions. Well, you know what is meant by it.

Motion Sensor Outdoor Lighting is one type of alarm circuits that is widely available market price of about $ 40. However, on this occasion will be explained in a fundamental fact about what is in a motion sensor outdoor lighting box, so you can be a little bright on this.

Motion Sensor Switch Circuit

The main components of a motion sensor outdoor lighting is a Passive Infrared (PIR transducer), BS170 Mosfet transistor as the high-gain amplifier (switch), Relay 12V DC as the AC power switch and some diodes, resistors, electrolytic capacitors, and input / output AC terminals to the lamp.

Motion Sensor Outdoor Lighting-Switch

Select a PIR sensor unit in accordance with the required sensing distance, you can contact the nearest vendor, select ready-made box type. Relay type is selected in accordance with the lamp load. However, this also will affect the transistor mosfet as a switch. Since this is aimed at light load, then you need to modify the power transistor.

In a test using 12V DC lamp types. If the motion sensor circuit is functioning as you need to put a PIR motion sensor module by considering the source of motion, for example, regarding human height and adjust the height placement module.

Each time the PIR module detects movement of a living body. The output relay and switching mosfet in the circuit is switched to the part through 150 Ohm resistor and associated components. As a result, the relay on the output transistor is switched on and the lights get power supply through a relay (RL) contacts.

Motion sensor outdoor lighting is only, as an illustration, not recommended for those of you do not have enough knowledge of electronics, because this will your safety concerns related to AC power.

The X10 technology in order to control the different strand of Christmas lights

The project uses the X10 technology in order to control the different strand of Christmas lights.

Explanation

The use of X10 provides more simplicity for controlling the 3 strands of lights per color. Each strand has its own X10 lamp module which enables the lights to fade in and out instead of instantly turn ON or OFF. The lights are wired in series with one plugged into the end of the other and the head strand is plugged into each X10 module. Behind the tree is a power strip where all the X10 modules are plugged, which keeps them out of sight of visitors.

The X10 computer interface module (CM11A) is the main controlling feature of the entire system. A server running Ubuntu that is turned ON all the time is connected to the interface. As long the equipments are on the same power grid, they don’t have to run in the same place since X10 is a power-line radio protocol. The tree can be placed in a separate room while the computer is in another room. A simple serial string is sent by the computer to the CM11A module.

6V Battery Operated Doorbell Light Circuit

Doorbell Light Circuit
This 6V battery operated doorbell light circuit can be connected in parallel with any existing AC230V doorbell. When anyone push the doorbell switch, the bell sounds as usual and ac mains supply available across the doorbell is routed to the input of this circuit through an opto-coupler(IC1).

Conduction of IC1 triggers a monostable, wired around the good old 555 timer (IC2). As a result the high-bright white LED (D2) at the output of IC2 is switched on for a short time. This circuit is highly useful at night/midnight as it gives sufficient indoor light to help you locate switches for room lamp/porch light, etc. On/Off duration of the LED light can be increased/decreased by increasing/decreasing the value of C2.

The electronic doorbell light circuit is fully safe because it is perfectly isolated from the fatal ac mains supply by IC1. However, keep to avoid accidental contacts with the front end of the circuit, which is directly connected to the ac supply. Use of a good and convenient ABS enclosure is recommended for this doorbell light unit.

S:www.electroschemetics.com

Simple Automatic Light Switch Circuit for Bedrooms

Automatic Light Switch Circuit Schematic

Here is an ultra simple automatic light switch circuit for bedrooms. After construction,connect the input terminals of this circuit in parallel to the internal buzzer terminals of a Quartz-Alarm Clock. When the clock alarm is activated at a time set by the user, electromagnetic relay in the circuit is energised for a short duration, controlled by the timer IC 555.
Contacts of the relay can be used to switch on a bedlamp, table lamp or similar electric light loads. The circuit works off unregulated 12V.U se any12VDC/500mA rated standard ac mains adaptor.



When the clock alarm rings, input pulses are fed to the trigger input point (T1+Pin2) of IC1, through an RC filter (C1,R1&C2). Here IC1 is wired as a monostable and dc voltage at its output (Pin 3) terminal goes high instantly after receiving a trigger,and remains in the condition for about10 seconds, as configured by the components values of R3 and C3.

Output from IC1 directly drives the low current relay RL1 through diode D1. Note that diode D2 is here used as a freewheeling diode to suppress the counter emf generated during relay switching.

Too Simple Mini Emergency Light Circuit

Mini Emergency Light Circuit

This is an LDR based Emergency Lamp that turns on a High watt White LED when there is darkness in the room. It can be used as a simple emergency lamp in the child’s room to avoid the panic situation in the event a sudden power failure.It gives ample light in the room.

The circuit is too simple so that it can be enclosed in a small box. A 12 volt miniature battery is used to power the circuit. Two transistors T1 and T2 are used as electronic switches to turn on / off the white LED. When there is sufficient light in the room, LDR conducts so that the base of the PNP transistor T1becomes high and it remains off. T2 also remains off since its base is grounded. In this state, White LED remains off. When the light falling on the LDR decreases, it cease to conduct and T1 forward bias providing base current to T2. It then turns on and White LED switches on.
White LED used in the circuit is 1 watt High bright Luxeon LED . Since 1 watt White LED consumes around 300 milli ampere current, it is better to switch off the lamp after few minutes to conserve battery power.

AUTOMATIC ROOM LIGHT CONTROL WITH BI DIRECTIONAL VISITOR COUNTER

AUTOMATIC ROOM LIGHT CONTROL WITH BI DIRECTIONAL VISITOR COUNTER

Filed Under: Automatic room light Control with bi directional visitor counter circuit, Circuti Ideas, Uncategorized by IndianEngineer — Leave a comment

May 12, 2010

Project title is “AUTOMATIC ROOM LIGHT CONTROLLER WITH BIDIRECTIONAL VISITOR COUNTER “. mICROCONTROLLER BASED PROJECT

The objective of this project is to make a controller based model to count number of persons visiting particular room and accordingly light up the room. Here we can use sensor and can know present number of persons.

In today’s world, there is a continuous need for automatic appliances with the increase in standard of living, there is a sense of urgency for developing circuits that would ease the complexity of life.

Also if at all one wants to know the number of people present in room so as not to have congestion. This circuit proves to be helpful.

CIRCUIT DIAGRAM

Automatic room light Control with bi directional visitor counter circuit

RECEIVER CIRCUIT


The IR transmitter will emit modulated 38 kHz IR signal and at the receiver we use TSOP1738 (Infrared Sensor). The output goes high when the there is an interruption and it return back to low after the time period determined by the capacitor and resistor in the circuit. I.e. around 1 second. CL100 is to trigger the IC555 which is configured as monostable multivibrator. Input is given to the Port 1 of the microcontroller. Port 0 is used for the 7-Segment display purpose. Port 2 is used for the Relay Turn On and Turn off Purpose.LTS 542 (Common Anode) is used for 7-Segment display. And that time Relay will get Voltage and triggered so light will get voltage and it will turn on. And when counter will be 00 that time Relay will be turned off. Reset button will reset the microcontroller.Microcontroller based Visitor Counter.

TRANSMISSION CIRCUIT

This circuit diagram shows how a 555 timer IC is configured to function as a basic monostable multivibrator. A monostable multivibrator is a timing circuit that changes state once triggered, but returns to its original state after a certain time delay. It got its name from the fact that only one of its output states is stable. It is also known as a ‘one-shot’.

In this circuit, a negative pulse applied at pin 2 triggers an internal flip-flop that turns off pin 7′s discharge transistor, allowing C1 to charge up through

R1. At the same time, the flip-flop brings the output (pin 3) level to ‘high’. When capacitor C1 as charged up to about 2/3 Vcc, the flip-flop is triggered once again, this time making the pin 3 output ‘low’ and turning on pin 7′s discharge transistor, which discharges C1 to ground. This circuit, in effect, produces a pulse at pin 3 whose width t is just the product of R1 and C1, i.e., t=R1C1.

IR Transmission circuit is used to generate the modulated 36 kHz IR signal. The IC555 in the transmitter side is to generate 36 kHz square wave. Adjust the preset in the transmitter to get a 38 kHz signal at the o/p. around 1.4K we get a 38 kHz signal. Then you point it over the sensor and its o/p will go low when it senses the IR signal of 38 kHz.

PCB LAYOUT

Traffic Light Control Circuit This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous sequentia

Traffic Light Control Circuit

This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous sequential manner. The circuit make use of the 74LSxx family of TTL integrated logic devices. The circuits are designed to drive light emitting diodes or low current, low voltage incandescent lights but can also drive other loads of up to 80 milliamps.

As logic circuits go, the 20 Step circuit is fairly simple but due to the high speed nature of the TTL Logic devices used, care must be taken when wiring these circuits. Simply put; The neater the wiring the better.

If you would like to make use of these circuits, please take the time to find and read at least the first 2 pages of the manufactures data sheets for the integrated circuits. Using Google, search for "74ls(part number)" in the first box and "PDF" in the second box on the advanced search page.

A printed circuit board and parts are available for this circuit.

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20 Output Sequencing Circuit

The following schematic is for the 20 Output Sequencing Circuit on the circuitboard shown above.

Basic Circuit Operation

• The circuit is stepped through the sequence by an adjustable LM555 astable oscillator.

• The Oscillators output is divided by a 74LS90 divider into a 10 step BCD weighted output.

• The BCD output then drives two 74LS145 - 1 of 10 decoders (See Notes) that are used to produce a 1 of 20 step output sequence.

Notes

• The circuit does not drive the 74LS145's directly but uses a 74LS107 JK Flip-Flop and four 74LS32 dual input OR gates to control to the inputs to the two 74LS145 output drivers. The 74LS107 and 74LS32 are used to create disallowed states in the output drivers alternately. The disallowed states prevent any of the ten outputs on that particular device from being turned ON while the other 74LS145 is in counting to ten.

• This produces a system where only one of the 74LS145's is able to produce a LOW output state at a time. In essence the circuit counts to 10 twice in succession rather than counting to 20 in a single cycle.

• This may seem like an unusual method but it allows the circuit to make economical use of the open collector outputs of the 74LS145s decoder/drivers rather using output buffer ICs driven by 74LS138 logic devices.

• The TTL logic devices in the circuit require a regulated 5 volt supply and draw approximately 60 miliamps. The outputs of the 74LS145's can be supplied from up to 15 Volts with a maximum current of 80 milliamps.

• The circuit above is shown in a continuous running mode. The circuit can also be externally stopped and reset as shown in later diagrams.

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74LS145 Equivalent Output Circuit

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Parts List

The following is a parts list for use with the 20 Output Sequencing Circuit. Mouser Electronics part numbers are shown but the parts may be available from other sources as well. Suppliers that handle 'NTE' components should be able to get the ICs.

Part Number		Mouser Description		Mouser Part #		QTY
VR 1	-	Voltage Regulators TO-92 5.0V 0.1A	-	511-L78L05ABZ	-	1
IC 1	-	Timers DIP-8 Single Timer	-	512-LM555CN	-	1
IC 2	-	DECADE COUNTER DIP14	-	526-NTE74LS90	-	1
IC 3	-	DUAL J-K F/F DIP-14	-	526-NTE74LS107	-	1
IC 4	-	QUAD 2-IN OR DIP-14	-	526-NTE74LS32	-	1
IC 5, 6	-	BCD-DEC DECODER DP16	-	595-SN74LS145N	-	2
R1	-	100K ohm / 1/4 Watt Carbon Resistor	-	660-CF1/4C104J	-	1
R2	-	Trimmer Potentiometers 1Mohms 6mm	-	531-PT6KV-1M	-	1
R3	-	470 ohm / 1/4 Watt Carbon Resistor	-	660-CF1/4C471J	-	1
C1, C3	-	Radial Electrolytic Capacitors 25V 10uF	-	140-XRL25V10	-	2
C2	-	Radial Electrolytic Capacitors 25V 1.0uF	-	140-XRL25V1.0	-	1
D1	-	Green 3mm LED	-	859-LTL-4231	-	1
-	-	2 Position Terminal Block - 5mm	-	651-1729018	-	1

The 1N4148 diodes for the traffic signals shown below are Mouser part number 78-1N4148.

NOTE: The LEDS for the traffic signal lights must be selected by the user as their size and style depend on the mounting.