TFDU4100 (PC infrared serial connection)?

I have this infrared transceiver module tfdu411 : data-sheet here the recommended circuit is here well, this circuit is for motherboard with built-in IRDA port , and sure mine does not have one so , can i built this connect this circuit and connect it directly to the serial 9 pins port ? if not , is there any way to connect this module the the PC and build an infrared transceiver ? thank in advance

Asked by lu2a 7 years ago

How to use a television remote to on/off a DC motor?

I want to make infrared remote control for dc motor using a tv remote. Please help me!!!!

Asked by RUDR 3 years ago

How to build a infrared transmitter & receiver ? Answered

I am on a build to make a led display for my room , i want to toggle it on/off  using a infrared remote & that is the part i have no idea how to do ( I am not good at IR circuit's ), Googled it but was unable to understand them. I would be greatly thankful  if someone could help me on how to make it  , & the part's that would be required ( or simply link to any good instructable ) Have a nice day guy's Regards Bobblehead Einstein

Asked by Bobblehead Einstein 5 years ago

Chmistry buffs: IR invisible ink?

Hey all science-type people, I've seen invisible ink pens and things for sale that contain ink that show up in infrared, instead of ultraviolet light.  That's really appealing to me for a number of project ideas because digital cameras pick up IR exteremely well (especially with their filter removed). The problem is I think I'm going to want a lot of it, and those dumb little pens are crazily expensive. So any of you chemistry buffs out there have a secret formula I could make?  I'd prefer something invisible in regular light, but hey, whatever you've got. :) Thanks in advance for your help, -Kurt

Posted by PS118 7 years ago

Remote switch for battery powered LED

Hi. Firstly, I'm a software man, never done an electronics project but I own a multimeter and can use a soldering iron.  So here's the problem: for my son's wedding in May (that's him in the pic), he's rented an ancient barn with a beautiful timber roof going up to 5 metres. They want to decorate it with coloured paper lanterns, hanging on invisible fishing line. I suggested lighting each lantern with cheap battery operated 10 LED strings. Problem is how to turn them on/off from ground level, say 4 metres away. So I'm thinking infrared triggered switches. There's going to be about 30 lanterns so the receivers must be cheap on components. Here's a possible example of the LED's   Voltage can be 3 or 4.5v DC depending if 2 or 3 battery model is chosen. I don't know the current of the LED strings, I'm thinking I'll need to insert the receiver switch inbetween the battery pack and the LED load. Hopefully the receiver won't drain the batteries too much in "standby" as we might need to rig the lanterns 4-5 days before the wedding and it's not practical to get up to the lights again. So, long explanation... I've seen a couple of projects on this site which look nearly right but my knowledge isn't enough to make adjustments. Can anyone give me a solution from which I can build a prototype? I'm hoping I can use an old TV remote as the transmitter. Thanks in advance for your help

Posted by juskat 5 years ago

Is there a way i can see infrared? Answered

I know i can use a camera, is there a coating i could apply to glasses?

Asked by XOIIO 8 years ago

I need to remotely turn on and off 55 tvs in school classrooms. How can I build an IR system for this? Thanks, RM

I want to build a hardwired IR network in the school building to each of the tvs. What all components would be needed and how to assemble these components?

Asked by 9 years ago

How can I turn a Sony Handycam w/nightvision into a Thermal Imaging cam with temp?

I want to View Electrical Wiring and motors for hot spots and lose connections. I have a Sony Handycam with the night vision that I can use. It is going to be used in a Vocational High School for Teaching Students electricity

Asked by electricproff 8 years ago

IR heaters?

Hi all, So I've been searching / reading up on IR heaters and I can easily find IR bulbs /heaters, at 30W+ but the bulb's are pretty big (in regards to what I want). Is there not any smaller-scale /electronic componets for producing IR heat? I know there are IR LEDs but is that the same thing? I'm a bit lost and I swear I came across something before that had an array of small scale IR heating componets, but quite frankly I dont really know what I'm searching for, in regards to a correct name etc... Thanks in advance :)

Posted by lukus001 10 years ago

IR Switch. Will this work? Answered

Hi Guys & Girls Obviously, i am new to this and my electronics knowledge is very limited. Let me first explain what my desired outcome is and then proceed with the questions i have. In the schematic below i connected two circuits that i found. One is a infrared receiver and the other a flip flop. With that, the following needs to happen : when the user presses a button on a IR transmitter aimed at the receiver circuit in the schematic it is sent through pin 3 to the flip flop circuit which in turn puts the relay in a (permanent) ON state. When the user presses the same button again, the process is repeated and puts the relay in a (permanent) OFF state. So bottom line a 1 button/channel IR press on press off switch to switch my 12v circuit on/off. Here are my questions: 1. Is the receiver circuit correct as i have drawn it i.e. will it work? 2. Is the flip flop circuit correct as i have drawn it i.e. will it work? 3. Where i have the red circle : 1. Is the connection between the receiver and flip flop circuit there correct? 2. Do i need another resistor there? 4. Do i need a “floating resistor” as a R5 around the relay and how does the practical application of this look (on all the diagrams i look at it’s drawn around the relay going from an input to an output on the same wire......does that mean that on the pcb it will run parallel between the “pos+ and neg-“ going into the relay?) 5. Is my relay connection correct within the blue circle? 6. All and all, put together will my circuit work as expected? I know there are probably a whole bunch of ways to achieve the result i am looking for and being a noob, this might be the most impractical(i don’t know), but the reason i went this route is because i have these components available to me and if at all possible, i would not want to go and buy other components. Thanks in advance for any help provided. I find it much easier to learn by building the circuits and then seeing with a multi meter etc. what the effects of each component is than reading through all these books and trying to cram everything into this thick skull of mine  Schematic Component Values : R1 = 220k ; R2 = 100k ; R3 = 10k ; R4 = 10k ; R5 = ? C1 = 1uf ; C2 = 0.01uf ; C3 = 10u Rx1 = Any tsop/similar U1 & U2 = 555 timers

Asked by GhengisKhan1981 9 months ago

infrared switch

I was wondering if they make infrared activated switches, so its like wireless. if they do where can I get them, I've seen those 10x things but they don't really appeal to me.

Posted by Jordo 10 years ago

USB Infrared Receiver for PC

 I have been wanting to build a USB Infrared Receiver because I do not have a serial port, and I do not want to use a USB to serial. What do you all think of this idea?

Posted by colton.asu 8 years ago

Infrared detector help? Answered

I have 2 infrared detectors (like the one in picture) with 3 pins and want to make a simple detector to turn power on and off. The reason is that I want to make a line following robot. I only need to be able to put enough power through it to power a relay on or a transistor. Please help I need to know what all of the pins do and how to use them. Or even better a curket dyagram that turns power on and off by infrared without using micro processors.

Asked by David97 7 years ago

IR (infrared) "motion detector" of sorts, need help please

I am looking to build a sort if motion detector that works with 2 IR emitters, 2 IR receivers and a motor, the emitters and receivers would be  in 2 seperate circuits and lined up with eachother  (the emitters constantly on) and when the link to the receivers was severed (for example by someone standing between the emitter and receiver) the motor would rotate, if the left emitter-receiver combo was disrupted it would apply positive voltage to the motor and if the right emitter-receiver combo was dusrupted it would apply negative voltage, is this even remotely possible? Firezone

Posted by firezone 8 years ago

Infrared Detector

Hello Everyone  I'm making a coil gun and not sure how to make a infrared detector, so when my projectile is going down the barrel an infreared sensor will detect the projectile and activate the next coil. Thanks Everyone 

Posted by jackopiny 3 years ago

Bluetooth remote?

I really really really hate infrared remote controls. When I'm sitting comfortably, I always have trouble pointing it just right. Of course I realize this is probably an issue with my setup, but it wouldn't be an issue if the remote used Bluetooth. So I figured I'll write an Android remote control app that pairs with a little Bluetooth box that has an infrared led pointing right at the decoder. Thing is, the programming is no issue, but I haven't built anything more involved than an AV-switch box in the last decade. So I'm hoping someone can give me some guidance on using off-the-shelf components to pair/send/receive Bluetooth commands and decode them so I can flash the little infra-red LED. I'm perfectly happy to handle storage and all the other requirements on the phone.

Posted by KingCoder 7 years ago

Human Detector

I'm trying to come up with a small, cheap, simple circuit that will detect a human. I plan to use a grid of luxeon rebel OLEDs and whatever detector I come up with embedded in my ceiling to light up only when you are under them. I've looked into passive infrared, but it's fairly expensive for the components I could find. Any leads for circuits, ideas, or parts? I'd use parts from cheap security lights, but they tend to be around $10 each and I would probably need around12-18 ... kinda painful on the pocketbook. Thanks in advance for any help!

Posted by homba 10 years ago

Resistors are too warm

Hello,I am building a multi-touch surface using the FTIR method and after the surface is powered for about 10 minutes there is a heated smell in the room, I have noticed that the resistors are very warm and that a couple have started to brown or burn. I really need this table to be able to be safely powered at least 18 hours a day.Here are my specs:LED's:I am using 88 Infrared LED's (T 1 3/4 INFRARED LED, )--8 LED's per series--forward voltage of 1.5v --forward current of 100mAResistors:I am using 2, 10 ohm 1/4 watt resistors parallel (so 5 ohms) with each of the 11 series'Power Supply:The power supply output's 12 volts DC and 1.2 ampsWhen I calculate using it says I only need 1ohm 1/4 watt resistors, I haven't tried this yet but it doesn't seem to me that this would rectify the situation. My guess was that I need 1 watt resistors, but the calculator didn't seem to agree.Any thoughts as to what my problem is? is it safe to go with 1 ohm 1/4 watt resistors? or do I need 1 watt resistors? Any help would be very appreciated, thank you!

Posted by hapticdata 9 years ago

Magnetic or IR dog door

Does anyone know if it is possible to DIY a "smart" pet door? Something like this is what I'm talking about. Basically, I want to let the dog come and go as she pleases whilst keeping the cat inside. Thanks!

Posted by rday 9 years ago

RIR Sensor with ~3ft detection capability?

Question for you sensor experts... I'm looking to do a project that would involve detecting when an item passes through a doorway near ground level (~6 inches above ground level).  Doing a bit of research it looks like a reflective infrared sensor would do the trick ... only issue I have come across is that there seem to be a slew of these sensors with detection capability of about 15mm max and then another class of these (home security grade) that have detection capability for several 10's of feet. Any ideas on a RIR sensor (links appreciated!) that has capability ~2-3 feet?  Another caveat is I'd like to string up multiple of these sensors in a close proximity, each with the sensor observing a 2-3 ft area right in front of it. Thanks! Nick

Posted by NickF73 1 year ago

IR receiver and output over short distance

  I want to set up a short distant IR sensor(  

Posted by stino66 6 years ago

Photograph of extra-solar planetary system!

An article in Science News today shows an infrared image of HR 8799 with three roughly Jupiter-sized planets around it! The speckling in the center (around the "+") is the star.The same article shows two Hubble images of Fomalhaut taken 18 months apart. The two images show directly the orbital motion of a previously detected planet, Fomalhaut b.Update (10:12 pm PST 13 Nov 2008): I've attached the two pictures from the SN article. The first is the IR composite of the three-planet system HR 8799; the second is Fomalhaut, showting the offset of Fomalhaut b between 2004 and 2006. I encourage you to read the actual article to get the details of how the data was obtained, and to judge for yourselves its veracity.Update (12:05 pm PST 14 Nov 2008): The two articles are out in today's ''Science'' along with a news article and editorial (requires subscription).HR 8799: Morois, et al.Fomalhaut: Kalas, et al.

Posted by kelseymh 9 years ago

using TSOP4838 in anti-collision line follower

i want to use IR sensors with emitter part ( IR led ) - calibrated with an IC timer to give 38KHZ IR signal - mounted side by side - not face to face like the counter module - to the receiver part ( TSOP4838 ) which will turn on once something reflect the IR signal back to the receiver. [ the default is that IR signals will go straight forever without being seen by the receiver ]. I've followed the steps of a circuit using IR sensor in an object counter module it included transistors to be triggered instantly as described the problem is that it gives an instant pulse to trigger the 7-segment display. but in here i don't need it to be instant. how could i implement it to make the LED bright as long as i block the path [ not instantly ]. and to be off whenever there's no object in front of the robot

Asked by superdz 2 years ago

Infrared heating devices, has anyone made there owne ?

I was looking at the brand name model Eden Pure Infrared heater

Asked by bullit224 7 years ago

What do you think of this USB Infrared Receiver idea? Will it work?

I have been wanting to build a USB Infrared Receiver because I do not have a serial port, and I do not want to use a USB to serial. What do you all think of this idea?

Asked by colton.asu 8 years ago

How does infrared light affect plants?

Specifically tomatoes.

Asked by XOIIO 8 years ago

the infrared specturm?

I am making some nightvisionand as u should know it uses ir and i was wondering like what kind of things or phenomna may show up in it i wanna make sure i cant see ghosts if they are real what is their spectrum called too

Asked by crazycommanche=US= 9 years ago

IR (infrared) tripwire (arduino)? Answered

How can i build an infrared tripwire for my arduino bored i have a IR photo transistor and a IR led, What i want to do with this is control a relay which turns my light on when i enter the room and off when i exit. Thanks

Asked by Daniel Deacon 6 years ago

Infrared transmitter and receiver

I want to make a gadget which sends a few kb of data via infrared and also receives data via infrared with a timestamp. However, I am stuck as I have only used arduinos before and I have to design a circuitboard which I have never done before, with PIC microcontrollers (must be cheap ones). I need help a) choosing a microcontroller and b) assembling all the components into a circuitboard (ir transmitter, receiver, microusb port to transfer data to pc, battery). Gadget will eventually be portable so make everything light. Thanks Khalid

Posted by khabro 4 years ago

Infrared spectrophotometer price

Hi I have a PU9716 Infrared Spectrophotometer and want to sell it. I am not sure what it's worth or when it was made, but I am told its in working condition. I got it for free from some people for whom it did not provide accurate enough readings. I got some info of the plate on it: serial number: 371261 part number:9423 297 16151 program number:4013 172 55513 Made in England Any help is appreciated.

Posted by dkedr 7 years ago

Infrared Sauna wiring?

Well, I bought a used infrared sauna the other day for real cheap because it "just stopped working all at once". Figuring its just a fuse or something, I took it. Well now I cant figure it out for the life of me.What seems to be the problem is that no power is getting to the primary transformer. That would be on the second small circuit board to the right. It is getting to the secondary transformer fine. Heres a pic of whats goin on. Those things on the sides are fuse holders, (no not burnt out).

Asked by LiquidLightning 6 years ago

How can I replace a single wire with an infrared link?

I just want to have a digital communication interface become infrared. I have data going both directions, so I need to have the system be two-way. If possible, I would prefer using radio of some sort. For infrared, would it be as simple as an IR LED and NPN phototransistor at each end? EDIT: Bad news. The system needs 2 wires to transfer data. Since IR would mix together, I need to use 2 different radio frequencies. Does anyone know how to send and receive simple pulses of radio waves?

Asked by 4lifenerdfighter 6 years ago

IR Led Sources

Anyone have a source for near-infrared LED's? I want to build a night light for my video surveillance system. Maybe NIR wouldn't alert "strangers" until they are captured on camera. Thanks.

Posted by doctek 10 years ago

Can IR light from an Infrared LED pass through semi-opaque acrylic?

I'm making a modification of the Table for Electronic Dreams ( and want to expand it with white LED's that turn on and get brighter as an object above it gets closer to the surface of the table (I'll be replacing the LED's in the original instructable with blues).The only (and thus, the cheapest) way I can think of sensing this distance without cutting holes in the upper piece of acrylic is to use an IR transceiver on the circuit board and connect this to the white LED. Would this work? I'll be using .25-inch white acrylic if that makes a difference.Any assistance that you can provide is greatly appreciated.

Asked by SJBarag 8 years ago

Wiimote Whiteboard help?

So i have a wii remote and i made an infrared led pen and i want to do this project, but the software aspect really confuses me. i went to Johnny Lee's website to download the software but the windows visual thing you need to download has so many different options and i dont know which one to pick and some other links on his site, when i click them, it just downloads a folder and i dont know what to do with it. Can anybody help me out here?

Asked by texpert 5 years ago

IR Beam issues.

So I have been working on an airsoft tripwire type thing. I have the circuit entirely finished. I am using an infrared photoresistor and the one problem I am having is that I can't seem to focus the beam from the IR leds very well. I have three of these ( at my disposal. The IR leds are a pain to line up with the resistor on the circuit. So I ask you, what do you think I could do? Ideas on better ways to focus the beam as well as perhaps ideas for replacing the photoresistor are appreciated. The IR photoresistor came from radioshack. I'm pretty sure this is it:

Asked by DesChamos 8 years ago

Help with a learn to solder project using infrared LEDs

Hi, Recently my company remodeled our EE lab and was going to throw out a huge amount of electronic components, since they didn't care I took all of them instead.  Next spring I am likely going to teach a small class on basic soldering. I can solder well enough to teach others, but I can't design circuits at all. I'm looking for some kind of project that could use some of the parts. The coolest parts are infrared LEDs and Phototransisters. I have thousands of these Fairchild QSC113 and QEC122 I also have around 30 small piezio sounders/buzzers no part number A couple hundred red and green short leg LED (Can't do a cube matrix as the legs are short for a angled board level mount) Lots of small switches I know I have 3904 transistors as well as many other flavors but I don't have the numbers in front of me I also should have any small caps, resistors, diodes, and zener diodes I know I also had several 555 timers and lots of resonators and crystals in various speeds Circuit goals Through hole only No Surface mount Able to be made in 1-2 hours by new solderers Class will be limited likely to less then 10 attendees depending on # of soldering irons I can find Circuit has to do something with an effect like sound or light so they feel like they created something I would like any extra costs to be under $40 for the whole class as I will likely have to pay for it Each circuit needs to be able to be taken home Ages will be from about 14 to 75+ I do not have have most of my extra parts sorted but I do know a general "type" of the parts so feel free to use a part and I'll see if i have something similar. If I like your circuit I'd be glad to send you 250 of each of the infrared LED/phototransiters The class will be taught at Hoosier Recreation Workshop -Steve

Posted by nevets_mcd 4 years ago

Is there anyway to fix my remote?

So I just got a new TV for Christmas (yay me), but the remote is fubar'd. If the remote and receiver are offset by more than a few degrees, it stops working. It's working far worse than a normal TV/remote does. It's a normal IR remote. Any ideas of how to fix it? Thanks!

Asked by dedgerton 6 years ago

How can i make Remote Controlled Projector Platform?

I made a small platform that holds my projector. I use a battery and motor to make it go up and down. How would i go about make a remote control interface for this using IR? what would i need? appreciate any help i get!

Asked by liverguts99 6 years ago

How can I use the native IR port on my Dell to capture IR TV remote signals?

I liked this article about capturing IR signals, but what if I already have an IR device on the side of my Dell Latitude (D610, if it matters)? Is there some software that can tell the port to listen for remote control signals and save them as raw data?

Asked by V-Man737 8 years ago

Laser diode driver question

I'm planning on building an on building an IR light source for a DIY night vision setup. to do thus I'm using a 300 mw IR laser diode. the diode needs to be powered by 2.2 volts. I'll be using a LM317T to adjust to voltage but my question lies in the current needed. I'm familiar with powering LED's but not with diodes. since the power is 300 mw and the voltage is 2.2 V would i be powering it using about 130 mA? in addition to that how would I achieve this? I know the LM317 can be used as a current regulator but how is this done? any help would be appreciated, thanks.

Asked by senortaco 6 years ago

How to send numbers over IR with Arduino

Hey! When I buy a cheap remote from the store, and I run a IR receiving sketch, every time I push a button I get a series of numbers e.g. 1259575. Now I now how to receive IR. But how do I transmit a number through IR? Every where I go it is outdated and doesn't work. All of Ken Sheriff's stuff is sending special Sony, Panasonic and othercompany's codes. I just want to send a number. I just want to hook up an IR LED to Arduino and have it flash a number! Simple, right? Thanks!

Posted by HavocRC 4 years ago

Any good Transparent & IR through (not reflect it) Cheap Material?

Hello. I am trying to make a setup with using Kinect to see through the transparent projection screen. For cheap material, I used a transparent plastic vinyl (Greenhouse Covering) But the Kinect won't see through much of the transparent screen. Also I think the plastic screen reflects some IR light from Kinect. BTW, the screen is quite big. 10ft wide, 6ft high I tried with small solid plastic (CD case), and it worked perfectly, see through IR and no reflection. I don't know why this transparent vinyl sheet won't work... Is there any cheaper material that is applicable for IR through and less reflective? Or should I add extra bigger IR illuminator? Please help.

Asked by toshi182 6 years ago