| Search found 236 matches on edaboard.com: ir led vu led p4 led uv led ir led |
38khz transsmitter circuit need help here
any one can help me for this circuit below? is that any problem with this circuit in the link? can anyone tell me?http://www.electronicsforu.com/efyli...i-05-nov04.pdfthe circuit never mention what type of ir led be use, so i just simply buy and use ...
Hobby Circuits and Small Projects Problems :: 21 Nov 2009 11:38 :: FvM :: Replies: 37 :: Views: 1829
photoplethysmograph - pulse oximeter
loping a photoplethysmograph(ppg). it is very similar to pulse oximeter, but use only the infra red led.i would buy a finger clip probe that i can use in my project. at this moment im using a simple ir led and phototransistor for acquire my photople...
Professional Hardware and Electronics Design :: 20 Nov 2009 12:18 :: Katak :: Replies: 2 :: Views: 543
light dimmer using nec6122 ir protocol with pic12f629
i am doing a project for the light dimming.. using nec6122 protocol with pic12f629 in the ccs c compiler..could any body can help me....please send me the code.....
Microcontrollers :: 18 Nov 2009 5:05 :: Rizwan452 :: Replies: 2 :: Views: 81
ir remote control
hello. i need help about an ir remote control that can manipulate 3 light bulbs (typically 12v).i thought of a remote control with 9 buttons that would transmit 9 different frequencies than will be received by a frequency decoder (??).buttons:1-red b...
Hobby Circuits and Small Projects Problems :: 16 Nov 2009 18:48 :: Aya2002 :: Replies: 9 :: Views: 801
learning ir receiver project - a starting point....
hi all,im interested in expanding my electronics skills :d and have a small project in mind which will make use of a learning ir receiver. the receiver will act as a switch, will only require on/off and will need to learn a single ir code of an exis...
Hobby Circuits and Small Projects Problems :: 09 Nov 2009 8:42 :: pranam77 :: Replies: 4 :: Views: 414
ir comm. without modulation
hello guysmy current semester project involves ir transcieving using pic (pic16f628).the question is is it necessary to modulate the data (38 khz or 40 khz) in order to transfer it using ir or it can transferred normally (like data stream through usa...
Microcontrollers :: 07 Nov 2009 9:10 :: bobcat1 :: Replies: 5 :: Views: 180
constant current led driving
i want to use ir led and photodiode in my project as a sensor. and for stable working i have to assure constant current for ir led.how can i do this operation?could you post a simple circuit and its usage?...
Analog Circuit Design :: 04 Nov 2009 15:17 :: vistapoint :: Replies: 8 :: Views: 375
automatic room light controller
hello guys!im making a project where u detect the no. of persons entering inside a room and also detect the no. of persons inside. would u guys help me in giving a suggestion for a high precision infrared led detector so that this project may be pra...
Hobby Circuits and Small Projects Problems :: 04 Nov 2009 13:58 :: pranam77 :: Replies: 7 :: Views: 1710
rpm counter
i want to make a rpm counter using simple ir led and detector using the slotted disk and interface it with 89c51 can any one just give me the idea how it may be possible...
Microcontrollers :: 30 Oct 2009 9:26 :: madicalphy :: Replies: 13 :: Views: 1281
disk rotation counter for watt hour meter
hi there! can you give me an idea how to count the disk rotation of a kilowatt hour meter? need a photo sensor and a small pic that can be mounted inside the meter case. i need to have also a real time clock and program to store the time of use of el...
Microcontrollers :: 28 Oct 2009 14:04 :: mvs sarma :: Replies: 13 :: Views: 204
designing a pulse oximeter tsl230r based
edaboard.com/viewtopic.php?t=57616&highlight=heartbeat+monitorhey everyone , a newbee electronics hobbyist, want to build a pulse oximeter, have looked around on net .. havent got enough info on the circuits and source codes.. i thought i ll ask for....
Professional Hardware and Electronics Design :: 18 Oct 2009 5:39 :: juliusyee86 :: Replies: 34 :: Views: 9171
help regaurding sensors to count passing people
sir, my self praveen .i had a project in my mind, that is to design a visitor counter for shopping malls. my requirement for this is i have to display total count(entered and leaved from mall).i had no idea about sensors which works in such environme...
Other Design :: 10 Oct 2009 22:26 :: Old Nick :: Replies: 2 :: Views: 237
i need more range in ir
i am using tsop 1738 infrared recieverand a 38khz source using ne555 driving two ir lednow they are place on same pcb the ir rays reflected from the object in front and they are recieved by tsop1738i am maximized led current and i have tried to set f...
Hobby Circuits and Small Projects Problems :: 21 Sep 2009 19:13 :: Audioguru :: Replies: 19 :: Views: 1920
keyboard with ir leds- what sensors and microcontrollers?
hey m tryin 2 make a keyboard with ir ledsso what kind of sensors i will requireand what about the kind of microcontroller required...
Microcontrollers :: 19 Sep 2009 12:01 :: bobcat1 :: Replies: 4 :: Views: 165
dimmer switch without a microcontroller device help
we are having problem on how we will configure the remote control for adjusting the brightness of the led... can anyone help me how can you set that by using a tv remote control?...
Hobby Circuits and Small Projects Problems :: 16 Sep 2009 14:57 :: seadolphine2000 :: Replies: 8 :: Views: 600
giant full color led display
hi for all,i need info about large full color (rgb) led display, something like display used on futbool or tenis games,where i can buy this large panel?have someone experience on this field,best regards...
Microcontrollers :: 11 Sep 2009 18:10 :: prusanoff :: Replies: 68 :: Views: 11284
wavelength for pulse oximeter
hey all. i need to build a pulse oximeter for my final project in college but i still have one doubt about the wavelengthsdo these waves need necessarily to be 660nm for the red led and 910nm for the ir led?i have a 875nm wavelength ir led here. will...
Professional Hardware and Electronics Design :: 04 Sep 2009 15:47 :: Katak :: Replies: 8 :: Views: 873
infrared tx problem (urgent, need help!!)
it is a small project at work that i design a generic ir tx controller. carrier frequency, bit-time, and the number of carriers per bit time are all configurable. the controller has been loaded into fpga, with the tx signal connected to a fpga outp...
Hobby Circuits and Small Projects Problems :: 02 Sep 2009 3:00 :: yinchai2 :: Replies: 2 :: Views: 177
value of the photo resistor...??????
can any one pls tell wat value of photo resistor can be added to the sensor circuit of the line follower.....pls helpthanks.....http://img199.imageshack.us/img199/8908/31595493.th.jpg...
Electronic Elementary Questions :: 29 Aug 2009 10:05 :: vipinsaini :: Replies: 9 :: Views: 411
software based ambient light detection
/*generating 40khz low duty cycle pulses which will drive an infrared transmitter. when an object is infront of the infrared transmitter then the receiver ic will detect the object and an led will glow.i want the project to be immune to ambient ligh...
Microcontrollers :: 28 Aug 2009 13:09 :: fantabulous68 :: Replies: 8 :: Views: 520
auto switch circuit for bike light?
helloas this is my first post ill introduce myself. i am an aircraft technician in the army and am involved in the mech side of life. however i have a basic understanding of electrics and electronic circuits. ie. ohms law, power etc. i design and bui...
Hobby Circuits and Small Projects Problems :: 27 Aug 2009 20:47 :: betwixt :: Replies: 9 :: Views: 1000
mplab rc5 assembly programming
i am currently working with infrared perimeter/gate that use rc5 coding. could anyone help to change the source code of decoder part in order to suite my application(ir gate/fence). what i needed to do is to continuously monitor the encoded ir light ...
Microcontrollers :: 23 Aug 2009 20:49 :: guesslsc85 :: Replies: 0 :: Views: 352
rc5 transmitter and receiver using pic
i found out a website that teach how to program pic 12f629 using assembly language. could anyone help to verify whether the code is working. when i tried to assemble the code, it is successfully built but mplab assembler show some warnings as below:m...
Microcontrollers :: 23 Aug 2009 20:19 :: guesslsc85 :: Replies: 5 :: Views: 635
generating 40khz pulses with a microcontroller
generating 40khz pulses with a microcontrollersoftware based ambient light detection.the sensor is controlled by a microcontroller to generate the low duty cycle pulses, you can benefit from the high and low pulses to be able to detect any false read...
Microcontrollers :: 19 Aug 2009 21:23 :: pakitos :: Replies: 1 :: Views: 342
question of ir sensors
hii have an infrared project that in this project must be two infrared led (emitter/detector).when an object go between emitter and detector an speaker to sound but this sounds volume must change according to type of object (viewpoint of opacity perc...
Analog Circuit Design :: 17 Aug 2009 21:36 :: rezaf :: Replies: 7 :: Views: 514
pic program code for 38khz infra red modulation
could anyone provide some help on programming pic 16f 883 microchip to transmit a modulated pulse infra red(ir) led light with carrier frequency of 38khz and the data rate of 5 hz. on the receiving end, the other 16f883 microchip will have to decod...
Microcontrollers :: 11 Aug 2009 3:57 :: guesslsc85 :: Replies: 0 :: Views: 336
i want to measure length of foot using infrared.need help!
i am thinking of designing an electronic device that will measure your foot length and display the foot size in lcd or led. the first option i think of is using infrared because it seems to be easier to implement. anyone out there can give me a sugge...
Analog Circuit Design :: 02 Aug 2009 5:44 :: Ebald :: Replies: 4 :: Views: 366
ir proximity detector
hi all.i need help for a problem.i have a little device that can turn on a led when a person gets closer to it. the led remains on for just 1 second.i made reverse engineering and the schematic is in the attachment.what i would need is that the led c...
Hobby Circuits and Small Projects Problems :: 28 Jul 2009 0:16 :: marco0674 :: Replies: 5 :: Views: 699
infra-red liquid level detector
the design useful in liquid level or proximity detection. it should operate by detecting the distance from the target by reflection of an infra-red beam. it should safely detect the level of a liquid in a tank without any contact with the liquid itse...
Electronic Elementary Questions :: 27 Jul 2009 10:19 :: FvM :: Replies: 41 :: Views: 2103
ecg lead selector switch schematic
where can i find a complete schematic of ecg circuit ?...
Electronic Elementary Questions :: 13 Jul 2009 13:06 :: akss_here :: Replies: 38 :: Views: 15807
tsop1100 ir receiver output and operation
dear all,i am working on a project that need on three switches remotely via ir tx and rx. tx frequency is 38khz and ir led is used. tsop1100 ir receiver is used for rx and i can make 40khz 1s and 0s stream using pic according to the requirement. my q...
Electronic Elementary Questions :: 12 Jul 2009 18:20 :: thebrighter :: Replies: 0 :: Views: 204
library and models/proteus
some new components for proteus...
Software Downloads/Uploads :: 11 Jul 2009 4:04 :: raviraj :: Replies: 5 :: Views: 10220
wireless keyboard
any information on how to create a wireless keyboard using pic microcontroller?or any information on the design of a wireless keyboard..im glad also if anyone can share on wireless mouse too using pic microcontroller..a design on ir maybe a start..th...
Other Design :: 08 Jul 2009 10:38 :: N_Arm :: Replies: 9 :: Views: 2598
pic18f4520 : led blinking
ello,i am new for pic microcontroller (pic18f4520) series.i have successfully write program for blink led and checked onmplab simulator.now i have to check that with actual hardware.i have connectedc1 and c2 22 pf and xtal of 4.00 mhzpin 13 and 14 fo...
Microcontrollers :: 24 Jun 2009 16:13 :: fightstar :: Replies: 10 :: Views: 1434
circuit - ir sensor to read at <3cm distance (+10points)
i want to make the ir receiver highly sensitive that i could detect the ir light across the dc motor disc. it will have to generate a pulse when a cycle is completed.+10points will be awarded to a person who provide early exact solution.i need it to ...
Hobby Circuits and Small Projects Problems :: 20 Jun 2009 19:32 :: koolslash :: Replies: 2 :: Views: 252
how to simulate infrared receiver in multisim 9
im working on infrared remote control fan regulator. i designed the receiver with phototransistor but i cant simulate it in multisim 9 and there is no ir receiver ic like 1738 on the component database. it gives error each time i simulate the circuit...
Hobby Circuits and Small Projects Problems :: 09 Jun 2009 12:57 :: banjo :: Replies: 3 :: Views: 813
how to use ir detecting photodiodes...
hi,a few days ago, i got my self a an ir led and an ir sensor. the ir led looks just like a normal transparent red led but it is supposed to radiate ir.the sensor on the other hand looks very peculiar and is completely black in color and covered. i a...
Hobby Circuits and Small Projects Problems :: 20 May 2009 23:04 :: leoneqba :: Replies: 12 :: Views: 3762
pic16f877a chip - ir interfacing: need help
i want to signal condition a photodiode line sensor output to a digital input.although i am using the pic16f877a chip,i have designed, built and tested a bank of 8 ir transmitter/ photodiodes pairs.they all return 1.2 to 4.2 volts depending on a lig...
Microcontrollers :: 18 May 2009 17:21 :: herlambang :: Replies: 1 :: Views: 327
help me please.........very important question for me
hello guys,plz help me urgentlyquery is that how ir can pass through human finger or ear lobe suppose that we have ir transmitter & receiver .(ir transmitter) then i place my finger (or ear lobe) in between and then i place ir receiver .so none of th...
Electronic Elementary Questions :: 12 May 2009 13:20 :: gulabsingh :: Replies: 16 :: Views: 1113
resistor - led - resistor
i found just simple circuit with resistor 470 - led - about 2,0v - resistor 470. the voltage is probably 9v. i understand why there is the first resistor before led, but i do not know theres why another one?...
Analog IC Design & Layout :: 22 Apr 2009 13:43 :: Raviprasad_K :: Replies: 6 :: Views: 381
limiting resistor for 7 segment led display
hi,why do i need 7 seperate current limiting resistors for 7 segment led display?is there any problem in connecting a single resistor of high wattage at the cathode(in case of common cathode)?...
Electronic Elementary Questions :: 16 Apr 2009 5:38 :: thomaslg :: Replies: 13 :: Views: 1452
modified led chaser design
i am trying to build an led chaser using 4017 decade counters and a 555 timer chip. unfortunately, i dont know much about electronics outside of how to assemble a circuit from a schematic and plug values into v = ir. my design is based on that from...
Electronic Elementary Questions :: 14 Apr 2009 23:02 :: jar1087 :: Replies: 6 :: Views: 1185
led , ic , receiver & transmitter question
hi , i want my ic chip to control an led with a receiver connected it, with a transmitter i can control it to be off or on. but how do i go about doing it? i know i have to program the ic chip first, any link on some info will be appreciate , thanks ...
Electronic Elementary Questions :: 05 Apr 2009 2:24 :: srikanthsamaga :: Replies: 1 :: Views: 225
vary sensetivity of ir sensor
what is the best way to vary the sensetivity of an ir sensor pair using ir led and tsop1738 ?first of all, i want to know what is the maximum practically achievable range using the above sensor pair.a circuit which can reach this range will be great,...
Robotics and Automatics Forum :: 04 Apr 2009 5:58 :: dilraj.n :: Replies: 6 :: Views: 780
rs232
how to connect d rs232 to a wireless, so it can send data via wireless.anyone can help...
Microcontrollers :: 17 Mar 2009 5:02 :: yupng :: Replies: 18 :: Views: 1371
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dot-matrix display(led matrix) points for a good design.
of knowlegde on 8x8 dot matrix, and now im planning to use a dual dot-matrix..im using 8051 microcontroller(at89c2051), and now my problem is designing a dual-matrixdisplay..please suggest me a good circuit configuration,that would be capable, if i e...
Microcontrollers :: 17 Mar 2009 5:01 :: yupng :: Replies: 69 :: Views: 17991
555 astable oscillator mode; help with debugging
mplitude on pin 3 decaying to nothing in about 10 seconds once the power comes on.the application is to have the 555 serve as a gated oscillator and create a 38 hz carrier for the pulse codes from an ir detector. the output then drives an ir led to s...
Hobby Circuits and Small Projects Problems :: 16 Mar 2009 7:33 :: AlBo :: Replies: 2 :: Views: 417
coulor temperature sensor/meter?
hello, i was wondering if anyone knows of a circuit designed to measure coulor temperature.i came across this in my search:in general, color temperature meters available on the market today are comprised of three silicon photodiodes filtered for red,...
Electronic Elementary Questions :: 13 Mar 2009 9:17 :: FvM :: Replies: 5 :: Views: 477
how to write at-commands on an mcu?
hi everyone,.. i know that this topic might be repeated but im really confused. i have a nokia 6610 and i want to connect it with pic16f877 via serial cable. my only problem is: how to write the at-commands in basic or c languages? for example: at+c...
Microcontrollers :: 09 Mar 2009 22:45 :: moeen :: Replies: 82 :: Views: 20746
ir led
does the ir led in this circuit lights just like the ir led in a tv remote control?i have tested it but the ir leds does not light when supplied with 5 volts. it looks like it lights when it is supplied with 5 volts as circuit provides....
Hobby Circuits and Small Projects Problems :: 04 Mar 2009 14:43 :: donrigor :: Replies: 17 :: Views: 1011
pic rc5 code
can anyone share c code for decoding rc5 signals using pic microcontoller? ive googled for days and all the code that i found used delays to sample the signal..which causes problem when rc5 signal timings are slightly different than standard. none of...
Microcontrollers :: 19 Feb 2009 21:11 :: btbass :: Replies: 60 :: Views: 20275
how can i reduce led's power consumption?
hello every one. wish you all a happy and prosperous new year 2009.while experimenting with white leds i tried to run 60 leds with 6 volts 4.5 ah battery, and connected as given in the schematic. i have assumed each led has a forward drop of 3.3 volt...
Hobby Circuits and Small Projects Problems :: 16 Feb 2009 9:32 :: pranam77 :: Replies: 23 :: Views: 2772
high-side fet on/off switch
what is the simplest way to turn the high-side fet on/off. i have at my disposal an isolated 16vdc supply. the mosfet is used as a switch (not being pulsed so a bootstrapped driver or transformer won’t work). i’ve used photo moss drivers but they use...
Analog Circuit Design :: 15 Feb 2009 1:48 :: max0412 :: Replies: 3 :: Views: 2163
ir emitter/detector circuit
hi gang, i need your help again.im using this simple ir emitter/detector circuit.http://images.elektroda.net/73_1233391217.jpgnormaly, the circuit output is 5 volts, when the detector detects the ir light, the voltage goes to 0 volts.my question is: ...
Electronic Elementary Questions :: 01 Feb 2009 1:18 :: gnomeman :: Replies: 3 :: Views: 1335
choosing a transmitter/reciever
my ultimate goal is to use an infared remote control, remove the led and install a optocoupler in its place. then use that as a serial input into the rf ic. at the receiver end i would change back to ir.im looking for some guidance, ive been looking ...
RF, Microwave, Antennas and Optics :: 31 Jan 2009 0:27 :: tanky321 :: Replies: 6 :: Views: 315
simple question about led
we know that a led is made up of gallium arsenide. plus we also know that it is a diode having p and n junctions.normally a silicon is doped with born to make p type and with phosphorus to make n type.we also know that a led has p and n type junction...
Electronic Elementary Questions :: 27 Jan 2009 14:09 :: prathat :: Replies: 8 :: Views: 327
charging 2 cell phone batteries
r that is for those batteries. i know that if i connect the 2 batteries in parallel, the charger will fully charge them in about 6 hours. i want to use the 2 batteries connected in series to power a circuit. with t......
Electronic Elementary Questions :: 13 Jan 2009 0:07 :: gnomeman :: Replies: 11 :: Views: 417
ir sender-receiver circuit
hello every one! i want to ask a question, is an ir led receiver like an ir led sender, but only in each configuration the ir led does its role?!plz also tell me whats the simplest configuration to design ir sender-receiver electronic circuit sensi...
Analog Circuit Design :: 11 Jan 2009 23:17 :: flatulent :: Replies: 2 :: Views: 1017
need information about white led
hiin the optical communiction course i need to know information about white led in the following 1-advantage 2-applications3-structure4-material5-state of art6-efficiencyand and more information so please can any one give me link to any site include ...
Electronic Elementary Questions :: 05 Jan 2009 17:27 :: Sherifftech :: Replies: 9 :: Views: 672
led lightbulb too hot inside ?
hello,in my local store i saw a 240v mains led light-bulb.the electronics (ics, caps etc) was visible as the bottom part of the enclosure was transparent.isnt this bad ?.....i mean, being transparent, it will mean it will allow infra-red etc to penet...
Electronic Elementary Questions :: 12 Dec 2008 0:07 :: FvM :: Replies: 4 :: Views: 189
how to choose suitable leds and photo transistor???
hi everybody,im designing a system which wirlessly receives signals from multiple devices that measures the concentration of oxygen in the blood (pulse-oxi-meter) and then processes and display the heart rate and oxygen concentarion on a screen... i...
Professional Hardware and Electronics Design :: 18 Nov 2008 18:52 :: alalim :: Replies: 3 :: Views: 213
heart beat monitor with infra-red and ldr sensor
hi allhere is an artical about the photo diode how to use them and signal conditioning modulated data receiving and lot more with applicationsand example...
Professional Hardware and Electronics Design :: 16 Nov 2008 15:37 :: elshaimaa_emara :: Replies: 54 :: Views: 21233
ir controller
im working on a project using ir led and ir detector to control a relay.i created a circuit using 555 timer to create 38khz square wave so that my ir led can transmit at 38khz. can anyone explain to me what kind of signal that will be output from the...
Microcontrollers :: 14 Nov 2008 2:56 :: penoy_balut :: Replies: 7 :: Views: 612
universal rf remote control
hi everyone.................i need information about universal rf remote control...i want to design universal rf remote control that can control tv,radio and other appliances.anybody,can u help me...................
RF, Microwave, Antennas and Optics :: 26 Oct 2008 9:59 :: IanD :: Replies: 7 :: Views: 510
reqd :ir transmitter and receiver in c
hai all i would like to construct a ir remote control transmitter and receiver both using a microcontroller, either 8051 or pic preferabily in c. any protocol will do.standard or custom . please provide links or examples for the same.my objec...
Microcontrollers :: 08 Oct 2008 14:36 :: nevis :: Replies: 12 :: Views: 6246
wireless update scrolling led display
please helpim working on a scrolling led display using 5x7 dotmatrix. im inplementing on pic18f series and looking for a means of updating without wires. wireless or infrared using rs232 port. please i need help....
Microcontrollers :: 03 Sep 2008 14:09 :: polag :: Replies: 5 :: Views: 534
modem
i need to construct simple infra red modem. the schematic is like below.after constructing it on breadboard, i think i got few new ideas to enhance it but i need some advice from the expert.http://img381.imageshack.us/img381/5645/modemae6.jpgfor case...
Hobby Circuits and Small Projects Problems :: 02 Sep 2008 14:27 :: banjo :: Replies: 3 :: Views: 216
how to use ir (infrared) in a simple way? thanks .
hi, everybody. i have designed a embed system ( at89s51 )..and now , i want to send some data from the 51 to pc (ibm thinkpad). as you know , to import irda stack to the 51 is a hard work. so, i will transport data in another way. as you k...
Microcontrollers :: 31 Aug 2008 9:56 :: zhtoad :: Replies: 0 :: Views: 168
1 lead ecg
hey there. ive been looking for some information on ecg over the forum but i cant find anything suitable for me on the subject...does anybody have any material on how to work with an 1 lead ecg? and is it possible to obtain the curve with just one le...
Analog Circuit Design :: 27 Aug 2008 16:04 :: rina_1220 :: Replies: 3 :: Views: 324
need good circuit for +5v from 230v ac using capacitor
for my dimmer circuit , switch circuits , i want to use triac in place of relay along with this i also want to remove the bulky transformer (bcoz controlling circuits current is just 5ma- 15ma).and last controlling circuits contains micro-controller ...
Hobby Circuits and Small Projects Problems :: 27 Aug 2008 15:52 :: jrguy8 :: Replies: 20 :: Views: 1011
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