Underwater, Ambient, Aquarium Lighting

I am building a DIY foam/crete background for my cichlid tank and would like to run LEDs underwater as ambient lighting under ledges etc. I want to run lines with single lights placed strategically in the background. Any thoughts on how I might approach this inexpensively?

Question by mretuck 7 years ago  |  last reply 4 years ago


Help with LED's

I would like to set up some ambient lighting with about 60 white LED's. What would be the best power supply? Parallel or series circuit? Resistors?

Topic by pmac93 10 years ago  |  last reply 10 years ago


LED Room Lighting with Ambient Music Change

Hi guys,  I have been reading through this site a lot and have wanted to get into a bit of electronics but I never really had a project that I wanted to start.  After months of deliberation I have decided on what I want to be my first project. The idea is to have light bars constructed with LEDs quite like the following Instructable https://www.instructables.com/id/Light-Bar-Ambient-Lighting/?ALLSTEPS .  Where my project changes is I would like the lights to 'dance?' to the music.  Now my idea isn't dependant on music volume, for the LEDs to light up but colour change as well.  The only way I could describe it, is quite like the iTunes visualiser. Now both my electronic/programming skills are very basic.  The electronics bit is relatively simple it's more the latter part of the project.  If anyone could steer me in the right direction, it would greatly be appreciated.

Topic by onggie 8 years ago  |  last reply 8 years ago


iPad ambient light sensor a camera? Answered

Is it possible that the iPad's "ambient light sensor" is really a camera and the camera will be activated in a software update (like the iPod touch (2nd gen) with the Bluetooth introduction in OS 3.0)? 

Question by johnlalevee 8 years ago  |  last reply 8 years ago


what is this sensor?

I found a blink pov from here (layne and wayne) they are prframming the pov using Ambient light sensor ( physically looks like Led) what is this ambient light sensor?? is the same as IR leds ??? can i replace it with any other thing??? because the ambient light sensor is not available in the market

Question by agent555 4 years ago


how to find what causes a LED strip ws2812 to work partially ?

HI All, i having trouble with my ambient light project. though it worked fine for a few weeks, all of a sudden less than half of the strip (the closer to PSU half) has been act strange and than stop to work. the rest of the strip work fine and still responsive. how do i discover which led is the culprit? is it possible that only part of the strip burnt or only one led? any suggestions for a quick test without ruin the led configuration on TV assembly. thanks in advance

Question by TalT3 3 years ago  |  last reply 2 years ago


I need someone to make an ambient tv backlight

Hello, well first off im not above getting my hands dirty by any means lol but i didnt think this would be a good first time ever messing with leds project for me. mostly because i want it to look nice and neat on my tv. i am looking for ambient tv back lighting for a 60" dlp tv. i want it to change colors with the screen colors? or to just the sound. whatever you think is best. i have an 120 volt outlet close by or the tv also has a usb that can be used as well. i just want it to look nice and bright and work properly. it doesnt have to have a remote control or anything. but i am open to ideas and help. i cant wait to hear what you guys come up with. please feel free to reply to this help wanted ad i guess this is the first time i have asked for help on a project so i am kinda new to this. thank you so much for reading my ad and hopefully helping me out. 

Topic by onlystatic 7 years ago


Using relays to control lighting?

I have one Banner QS18VN6LV Retro-Reflective light interruption sensor, and one Banner QS18VN6D sensor with NPN Relay outputs. How could use the set to say, power on lighting when one is interrupted and power them off when another is interrupted? What I want to do is use them in my home theater, to power on the room lighting, projector and audio equipment and lower the screen when the one at the top of the steps is interrupted, and power off the room lighting, and turn on my ambient LED lighting when the one at the bottom is interrupted. The only problem this may have, is that the retro one is always sensing something till interrupted, and the non-retro one is only sensing something when interrupted.

Question by macwhiz 6 years ago  |  last reply 6 years ago


Light controlled wildlife feeder

I want to create a box where the lid opens up based on ambient light. Basically the lid closes at night and is open during the day. It will be a wildlife feeder that deters (nocturnal) raccoons from eating all of the feed but allows daytime wildlife to feast heartily. Is arduino the correct setup. My basic design is to have a linear actuator opening the lid but was also considering a crank type system (similar to a steam engine drive wheel). I need to either be able to control how long the actuator extends when enough light is present and reverse the action when not enough light is present or turn a servo motor with a crank a certain distance. Id prefer to use the actuator since the lid will be about 10Lbs and will need to extend about 10”. Is this possible? if so, how hard would it be for a newbe be to program? Thanks in advance for the advice!!! Ive attached a crude drawing.

Topic by tincupchalice 4 years ago  |  last reply 4 years ago


LED "clip"

I need some sort of LED "clip". i need to make a long string of LEDs where i can change the individual LEDs easily. i need designs for both normal and 4-pin RGB LED's i was thinking something along the lines of the clips in breadboards. it doesn't have to be movable. i might need to have some sort of "doubleclip", so i can change the resistors for individual LEDs any ideas on how to make something like this? or where i can buy some?

Question by solidacid 9 years ago  |  last reply 9 years ago


Use my webcam to adjust screen brightness automatically for my windows computer. Answered

I have done a few google searches as well as some searching through instructables and have not found anything concrete about the application. There are apps that dim based on time of day (like Flux) but here in Florida, especially in the rainy season, it can get dark really quickly. There are a few apps for linux but my many forays into linux end up with me getting frustrated and removing the partition. I'm new to Instructables, but in the short time I have been a member I have seen that this site is undeniably the best on the web. If there were anywhere I would find what I'm looking for, it would be here. I have found a few interesting links: 1) Ambient Light sensors (ALS) are supported in windows 7: http://msdn.microsoft.com/en-us/windows/hardware/gg463470 2) A video by a Microsoft program lead back in 2008: Building Context Aware Applications: http://channel9.msdn.com/blogs/pdc2008/pc25 3) Here is a proof of concept for a contest. Someone has actually made a simple app. Unfortunately, it is constantly running and the UI is command line: http://sven.killig.de/BLUntrl/. It is hard to understand him as he seems to go in between German and English. I wish I knew how to program cause I would probably change the code and create a better UI. The best route to save power would probably to have the computer check every 10-15 mins or more (maybe even user selectable). So guys what do you think?

Question by tbrooks1 7 years ago  |  last reply 4 years ago


Solar

Using 2 or 3 batch solar water heaters will this sufficiently heat a 20 by 20 concrete floor well enough to wear light boots Ambient temperature 29 degrees!

Question by bullit224 8 years ago


how to make ambient RBG that run on computer PSU?

I plan to buy a Arduino board (Duemilanove) and that can connect to computer so I can changing color...(or changing color by itself via programming)...But I dont know wire them together to make them work. My plan is trying to make my computer tower light up at night and changing color by itself. I only need about 6 RBG leds in one Arduino board and power it by using 12v power supply ( I have Corsair HX 1000w). Please help me thank you

Question by 9 years ago  |  last reply 9 years ago


water-based kinetic LED lamp

I want to mak a kinetic light using high-powered LEDs to produce glitter line through a thin layer of agitated turbulent water in a wall mounted shelf. So, this gives me a few questions, but let me start with the idea I've got. I want to seperate a shelving unit (preferably solid wood not particleboard with some decent HxDxW) into two compartments. A glass sheet would be slid into grooves onto the side supports. The upper portion of the shelving unit would then be wood, waterproofed with some thin styrene plastic sheets. The bottom would then be composed of a large aluminum sheet (recessed slightly upwards for astheatics) which would house several LEDs in addition to the power adapter and voltage regulator. This would likely follow the "powering high powered LED" tutorial's alternate power source to the pucks. At this point a small pump would be placed into the upper compartment along with just enough water to submerge the pump to a safe level. Perhaps a small recess would be included in the top to allow instant colour shifts by using stained clear plastic sheets (this would reduce total illumination, but these are to be mood/ambient accents not primary lighting source) to avoid any of the more expensive/complex colour shifting lamps. The big question I have at this point is how thermally safe this would be, and how much LED I would actually need to achieve decent brightness. Also, I would prefer if the bottom was modular enough I could remove and work on it without dissasembling the entire assembly, but this may not be possible. Finally, I was wondering if I could run the heatsink material up the ront of the shelf, past the glass, and into the water (this should give great heat dissipation) and have a SAFE and STABLE waterproof join between a flush glass-metal joint with possible use of epoxy and/or silicone caulking. Anything not specified in here I'm uncertain of how to do exactly. So! If anyone has any ideas, suggestions, or awareness that this is pure madness (or has a better way t oget those glitter lines i lust for) please let me know.

Topic by JRGumby 11 years ago  |  last reply 11 years ago


Diffused LED

Hello, I am working on a lighting project. Right now I have a typical yellow LED (like so http://www.sparkfun.com/products/532) mounted in a 5" tube. It is shining through a frosted acrylic sheet at the end of the tube, 2" away from the LED. it creates a circle of intense light on the acrylic that is about 3" in diameter and then some ambient light around it. Are there any LEDs that are designed to diffuse light more so that the circle of intense light would widen and be a bit less bright? Thanks, Ben

Topic by BHSilverman 8 years ago  |  last reply 8 years ago


How can I make a power supply for cold cathode lights that would normally go into a computer power supply? Answered

I'm looking to put some cold cathode tubes behind my flat screen LCD tv and my computer LCD. I was going to pick up the Dioder lights at IKEA until I saw they were $50 for a set of 4!!! Any ideas? Is there an instructable that I missed? Thanks all.

Question by Joaquin9 10 years ago  |  last reply 10 years ago


Bug Report, 403 error when clicking image

I get a 403 error when I click an image in the comment here: https://www.instructables.com/id/Power-LED-Light-Bar-Ambient-Lighting/#comments and then click the image again after it has been brought into focus and the surrounding has been dimmed. If you can't get this error to repeat, let me know. Good luck, Awesome-aniac

Topic by Awesome-aniac 6 years ago  |  last reply 6 years ago


Request: Convert UNder-car neon tubes to household plug-in

I have neon tubes that I use to use under my car. I want to find a way to use them around my desk, or to add more ambient lighting to my room or something. I tried to find something to do with this, but had no luck. I am a complete noob,so if someone could point me in the right direction that would be awesome.

Topic by slevin711 11 years ago  |  last reply 11 years ago


What LEDs for a light signalling system that needs to be visible at over 1000 yards?

I'm building a light signalling system for a gliding/soaring club that will be used for indication to the winch driver. This is done by means of flashing lights where the on/off timing indicates the launch phase (take-up-slack, all-out or stop). The original plan was to use car spotlights (2 x 55W) but I am considering LEDs. Assuming LEDs would be suitable for this application (I have no experience of using high intensity LEDs) can anyone enlighten me (pun intended!) on what would be the best type to use i.e. colour, brightness, quantity etc. The light will be located at the launch point (i.e. where the glider starts from) and needs to be easily seen by the winch driver who is over 1000 yards away. It needs to be usable in bright ambient light conditions e.g. on a summer's day (yes we do occasionally get them in the UK!). Thanks

Topic by Biffo Bear 10 years ago  |  last reply 10 years ago


Usb ON/OFF switch device? Answered

I wanted to have a large amount of green LEDs power on with my xbox 360 slim for ambient lighting and just to look cool, with 30+ LEDs I cant power them directly from the USB port so I was wondering if there was a way to have them still turn on by only pressing the power button on the system.

Question by lamboboy732 7 years ago  |  last reply 7 years ago


Let It Glow! Contest Winners

Instructables and Monkeylectric are happy to announce the winners of the Let It Glow! Contest. The competition for this one was pretty fierce. Some very creative and crafty people entered some amazing Instructables and will be providing inspiration to other makers for a long time to come. The efficient LED was the most common tool of illumination, but there were also glowing bulbs, EL wire, candles, and even algae. It was a good show put on by all.If you didn't win, we highly recommend you check out the prize, the m132s from Monkeylectric. The pictures of it are fantastic and it looks even better in person.OK, on with the winners! Third PrizeThe authors of these Instructables will each receive an LED Throwie kit and an Instructables Robot t-shirt. 1up Mario Candle Animate with light Audio Visual Art....FOTC Style Building your own ambient color lighting bars Goldie's Toxic Waste Barrels Grow Your Own Bioluminescent Algae How to make an Iron Man Arc Reactor Light Bar Ambient Lighting LED Disco Light in a Jar! The Lucid Dream Machine Model Rocket LED Glow Effects Razor Scooter Underglow Double Mod! Second Prize The authors of these Instructables will each receive one (1) m132 bike wheel light, and an Instructables Robot t-shirt £5 Japanese lamp from recycled materials Animating Multilayered Engravings FlashBack - Backpack, Camelbak or Jersey Integrated LED Bike Flashers LED matrix using shift registers First Prize The authors of these Instructables will each receive a set of two (2) m132s bike wheel lights and an Instructables Robot t-shirt. how to add EL wire to a coat or other garment turn signal biking jacket

Topic by fungus amungus 10 years ago  |  last reply 10 years ago


Pimp My Room

Here's the deal:I'm moving.I have no furniture.I have a lot of stuff to store.I have no room.I want my new room to be an awesome sanctuary for rest and creativity. Help!I need your ideas to make my room the most efficient, effective, awesome place it can be, trick it out with lighting, stereo and unusual effects.Ideas?UPDATEHere's some stuff that's begun to inspire me, if it helps you get a better idea of what I have in mind.LIGHTING:Under-bed LightingSun Jarambient light systemand I want to hang a bunch of these from globes or something:Jar of FirefliesART, ETC.Vinyl Wall Art[https://www.instructables.com/id/Audio-Visual-Art....FOTC-Style/ Audio-Visual Art]Poster Magnet Board

Topic by scoochmaroo 10 years ago  |  last reply 10 years ago


USB Cold Cathode?

Hi, I have been wondering about creating an ambient glow around the back of my iMac with a usb powered cold cathode light or led strip, could anyone help me with this? i would prefer a prefab solution that doesn't involve much soldering or modification of hardware but that stuff is not necessarily beyond my skill level. (and sorry if this is in the wrong place, its my first post :P )

Topic by awesomesquared 8 years ago  |  last reply 8 years ago


how can i switch the standard light for an LED in a 'BiOrb' fish tank?

OK, i'll start by saying i know next to nothing about electronics, but i reckon this should in theory be a fairly simple hack. I Have a Baby BiOrb fish tank with 2 goldfish in. the tank is great, if a little small, and the lighting unit on the top of the tank is quite bright. i guess they use the same light unit in the small tanks as the large ones, so although its probably fine in the large tanks it's quite bright in a small one. i get the impression the fish don't like it too much as they spazz out a bit when its switched on. what i want to do is to replace the standard bulb with a less bright LED so that the lighting is more ambient and more comfortable for the fish. i've seen the moonlight ideas on here using blue LEDs which look really nice, however these tutorials are for building a setup from scratch and not for replacing components in an existing setup. the question is, what would i have to do to replace the bulb with an LED? the existing light is powered from a 12v plug which also powers the air pump; theres a central power box with two cables coming off, one for the light and one for the pump, so i guess its a parallel connection meaning theres a full 12v to play with for the light. would i need to add extra resistors or something like that, or is there such a thing as a 12v LED? what about several LEDs? (EDIT) - official literature says that the bulbs are 5w halogen bulbs. another option would be to add LEDs as a secondary light, maybe with a secondary switch for separate control to the main light. would this be easier at all? any knowledgable advice would be a great help as i've no idea where to start.

Question by 10 years ago  |  last reply 10 years ago


Laser detector array?

Hi ladies and gentlemen! I am looking to build a proof of concept, then a prototype on a laser detector array. I need a setup that will pick up a laser beam directed at it from up to 200M away. My idea was to use an array of photovoltaic cells hooked up in pattern. When a laser hit one or more of the cells the current would trip a relay that passed the current to a buzzer or alarm. My concern was that sunlight and ambient refection will cause false signals and trip the alarm. I am sure there is a way to set the system up so that the alarm only went off when there was a voltage spike in a single sensor, or put a variable resistor on it so that only light levels above ambient would set it off. The system will be deployed facing down towards the ground so direct sunlight should never hit the array. I would like to start off with a single photovoltaic cell to prove that the system works and then integrate the others to form the array. Thanks for the help!

Question by KTFlory 7 years ago  |  last reply 7 years ago


What would be the best IR receiver for 980nm IR laser 0-15KHz

Dear enthusiasts, please help me out. What would be the best IR receiver to use for detecting signal from 980nm IR laser 0-15KHz. I'm going for distance here. 200 meters is more or less the goal. The further the better. Ambient light might also be an issue as this is to be done outside in possibly sunny conditions. If anybody has any ideas or suggestions please, throw them out here. Thanks.

Topic by GusevAnton 1 year ago  |  last reply 1 year ago


Why do yellow (amber) & lime green LEDs suck?

In my experience, I have dealt with many colors of LEDs, and from what it seems, red, neon green, and blue LEDs tend to be pretty good at producing light as well as surviving abuse. They also tend to require the least amount of current. However, I have found that almost all the the classic lime green and yellow LEDs are very different, and generally don't give much light output even with significant amounts of current! I have a couple of ultra bright red and blue LEDs at the moment that will glow bright enough to see them easily only a 100 microamps! That is something I simply cannot do with any of the yellow or green LEDs I've ever had! A bit of research shows that GaN and InGaN is commonly used for the blue and neon green LEDs, while GaAsP, AlGaInP, and GaP are typically used for the old-school red, amber, and lime green LEDs. I imagine brighter and more rugged yellow LEDs must exist, given their use in stop lights and road signs. Do they in fact exist? Or is our yellow LED technology still stuck in the 1980s due to little interest in them and little to no R&D;? The reason I ask is because I want to build a light source utilizing amber and blue LEDs to mimic white light, and I'm purposely trying to select colors which will give a white light w/ extremely low CRI. However I want yellow LEDs that are a closer match to blue LEDs in terms of intensity, and preferably, efficiency. I did some small scale experiments with some unknown LEDs salvaged from christmas lights, and I am impressed how poorly this light renders colors! (and how quickly my 15 ohm resistor went up in smoke driving all the yellow LEDs I had to use to equal the light from a couple of blue LEDs!) although the light hitting white paper appears purplish white, colored objects seem ghostly and take on either a deep blue, muddy grey, or yellow. Perfect for maybe a haunted house ambient lighting! Add a 50Hz capacitive driver to get some good flicker and presto, worst light quality EVER! :D

Question by -max- 2 years ago  |  last reply 2 years ago


[newsletter] Light Sabers, Plasma Globe Tricks, Wall-E Robot...

Sign-up for our newsletter here. June 12, 2008 Welcome back! RoboGames starts tomorrow. If you can't make it this year, then you better enter our Robot Contest in the next couple weeks. The grand prize is a trip to RoboGames 2009! Winners have been announced for the Park Tool Bike Month. See who won! Check out these cool Instructables! Cheap Custom Lightsaber Build your own Battle-Ready Lightsaber! Use a good light source, and build it for cheap! posted by Ricardoaraujo on Jun 3, 2008 Turn a Cruise Full of Old People into a Death Defying Adventure In the immortal words of former Gov. Jesse Ventura, sometimes you gotta defy death in order to enjoy life. posted by iwasthinkingaboutsoup on Jun 9, 2008 Animate with light Learn how to make your own snazzy light-animations on the cheap for a music video or any other project! posted by buenoben on Jun 10, 2008 Wall-E Robot The movie comes out in a couple weeks, but you can start building your own Wall-E right now! posted by 4mem8 on Jun 6, 2008 Electroforming an Iris Seed Pod Commonly referred to as "dipping" in metal, this technique can make organic items permanent for jewelry. posted by MaggieJs on Jun 9, 2008 How to rejuvenate a box fan Many box fans are tossed just because they're too dirty. Here's how to clean one up for a few more years of use. posted by jgodsey on Jun 8, 2008 Ping Pong Ball Lights Sometimes you really need the diffuse glow of dozens of ping pong balls with Christmas lights in them. posted by advancedMischief on Jun 8, 2008 The ultimate, heavy duty, stackable, bullet proof, extreme saw horses! OK, maybe not quite bullet proof, but everything else is accurate. posted by Mikey D on Jun 1, 2008 Make your own tote bag from recycled plastic bags With a little time and creativity you can make some pretty cool stuff from all those plastic bags like this big tote bag. posted by user669 on Apr 8, 2008 Light Bar Ambient Lighting Add a bit of a colorful glow anywhere you want with a little bit of work and some inexpensive parts. posted by QuackMasterDan on Jun 9, 2008 Cable car Know someone who has trouble with stairs? A powered lift can help them move around more easily. posted by Mockfish on Jun 8, 2008 Win amazing LED POV kits! What have you done for robots lately? Winners to be announced next week. Make a High Voltage Supply in 5 Minutes Learn how to get up to 1,000 volts in just a few minutes. Be careful with this one! posted by Biotele on Jun 8, 2008 Creating, cutting and printing your own woodblock Learn the basic process for buying tools, cutting a woodblock, inking and then printing with it. posted by rbanks on Jun 6, 2008 Amazing plasma globe tricks! Just touching a plasma globe can get boring, so check out these new tricks. posted by highvoltage2000 on Jun 7, 2008 Plastic Bag Rug! This rug is pretty easy to make, looks really cool, and costs almost nothing! posted by denona on Jun 11, 2008 Leather Bracelets from Recycled Belts Make up to three custom leather bracelets from an old leather belt! posted by fungus amungus on Jun 6, 2008 Now go make something awesome, and I'll see you next week! - Eric

Topic by fungus amungus 10 years ago  |  last reply 10 years ago


Circuit/relay that senses when ac appliance is in use

Hello all, I am attempting to add some ambient lighting to my home theater system.  I would like the lighting to activate whenever the tv or receiver are switched on (these units are always on together). I am a novice tinkerer, who is capable of soldering and simple circuit design, but I am having trouble finding a way to activate the lights without opening (read: voiding the warranty) my receiver or television. What would be the easiest way to accomplish this? A few of my unformed ideas would be:      -A relay that could sense when a/c power is being consumed (aka, receiver/tv being switched on)      -Would some sort of hall effect sensor accomplish the above? I'm just not really sure how to tackle this one, any suggestions are appreciated.  My project priorities are (in order): 1) ease/simplicity of design, 2) the smaller the component size the better, 3) cost ---EDIT--- I'm not sure if this helps, but this item came to mind, a Small Engine Hour Meter http://www.buy.com/pr/product.aspx?sku=226358043&sellerid;=24561471  This item can sense the current to the spark plugs without a physical wire connection. (induction?)  I know that item is intended for dc use, but could one be adapted to AC?  Or does anyone know if the relatively low dc voltage signal to my speakers could be used to activate a product like this?  TIA

Topic by WOPR 7 years ago  |  last reply 7 years ago


How can I convert a transmissive to a reflective LCD screen?

Hello everyone, So basically a reflective LCD screen is one that has no backlight, and reflects ambient light off a type of mirror reflector, to allow the image on the LCD to be seen via reflection. An example of a reflective LCD screen is the Gameboy Advance's LCD screen. A transmissive LCD is one that has a backlight that transmits light, but does not reflect light. These are typically 99.99% of the screens out there, such as PC Monitors, Smartphone screens, etc... Now I would like to know how to turn a Transmissive LCD screen, into a Reflective screen, like the GBA screen, without the need for a backlight. The reason I ask this is because I need it for outdoor use (to be sunlight readable), and backlights can't compete with the sun, and having a strong backlight drains battery. I have done a lot of research on this, but can't wrap my head around how the GBA screen works. I have removed the backlight off my computer LCD screen, and added a reflective film beneath the rear polarizer on the LCD screen, but it obviously doesn't make it reflective. I'm obviously missing a crucial step. Is the reflective film in the GBA, 'sandwhiched' somewhere in between the actual LCD screen? Does anyone know how to make a Transmissive LCD computer monitor, into a Gameboy Advance Reflective Screen?

Question by davidwinst 2 years ago  |  last reply 2 years ago


How can I convert a transmissive to a reflective LCD screen?

Hello everyone, So basically a reflective LCD screen is one that has no backlight, and reflects ambient light off a type of mirror reflector, to allow the image on the LCD to be seen via reflection. An example of a reflective LCD screen is the Gameboy Advance's LCD screen. A transmissive LCD is one that has a backlight that transmits light, but does not reflect light. These are typically 99.99% of the screens out there, such as PC Monitors, Smartphone screens, etc... Now I would like to know how to turn a Transmissive LCD screen, into a Reflective screen, like the GBA screen, without the need for a backlight. The reason I ask this is because I need it for outdoor use (to be sunlight readable), and backlights can't compete with the sun, and having a strong backlight drains battery. I have done a lot of research on this, but can't wrap my head around how the GBA screen works. I have removed the backlight off my computer LCD screen, and added a reflective film beneath the rear polarizer on the LCD screen, but it obviously doesn't make it reflective. I'm obviously missing a crucial step. Is the reflective film in the GBA, 'sandwhiched' somewhere in between the actual LCD screen? Does anyone know how to make a Transmissive LCD computer monitor, into a Gameboy Advance Reflective Screen?

Topic by davidwinst 2 years ago  |  last reply 1 year ago


Does the current of a USB phone charger affect LEDs powered by it?

 Here's the story: I was reading Instructables one day, and I had a BRAINBLAST. If I were to add ambient LED lighting to my room, a USB phone charger would be a relatively convenient power source! So I got to work. However, while using online resistor calculators to determine the resistor suitable for this project, I noticed that they did not require the source current. This got me pondering. So the question is: Does the source current matter? Additional Information: 2 USB phone chargers Charger 1:     5V 1000mA Charger 2:     5V 800mA Resistor: 1.5ohm 2W Metal Film Resistor LEDs in parallel LED:     3.5V 25mA Help would be greatly appreciated!    :)

Topic by DELETED_lxnt 9 years ago  |  last reply 9 years ago


rgb led controller with ir remote

Hello to all my genious frndzz...as m new here but from past few months i really wanted to do some with rgb led's.....i am having 100 rgb led's, i want to control them so that i can get diffrent colour according to mood.....it would be more fun for me if i would b able to control it with tv ir remote.......plzzzzzzzzzzzzzz help me nd giv me all the design or details so that i can make all of it at home....on a simple pcb....i live in india, nd near my home there is no pcb designing shopwould thankful to u,ur help would definately make my dream of " my ambient light room" come true.thank u guys, nd plz dnt mind for silly questions if any i askd.

Question by japanjot 9 years ago  |  last reply 9 years ago


EXTREMELY LOW!! flow fan/power system

 EXTREMELY LOW!! flow fan/power system   I need to find an EXTREMELY low flow air movement system (Fan?) That can be powered on almost nothing! Think 1m^3/hr maximum. I need to link this with a low power solar system. (think calculator solar cell) Weight is everything. Really need to move 10-100cm^3 air every 2-3 minutes max with minimal weight and power requirements. Much lower than cell phone fan air movement with power that can be generated from a few-gram solar cell. I am not sure this can be done mechanically, may need some kind of ion movement system. The point is to exchange air in a 50cm^3 volume enough to prevent condensation in medium humidity environments, (40% of the area is at dew point) where weight is important and no power is available beyond ambient room light. 5% royalty if product is ever brought to market.

Question by sipfle 9 years ago  |  last reply 9 years ago


Transparent LCD - Alpha Channel Monitor

I'm working on a project for my MFA, and am trying to figure out how to hack some LCD's. The idea being that I need a screen that will simply display black or transparent, no colors, but it should be able to accept video input of some type. Hacking a tv or iPad seems the most likely route. The remaining image should show the ambient background through the screen with certain areas shaded according to the luminance or darkness of the video input. While I understand that with all of the polarizing filters applied, light transmission is less than 5% in some lcds, I don't know what happens if you remove the polarizing filters? I remember the old 'Tiger' lcd games that were quite transparent and high contrast, but they definitely didn't play any video! If anyone has any experience with LCD's and the polarizing filters, I'd love to hear your input. Alternately, if anyone has ideas on a video capable b&w; display... They all seem to be for medical purposes and are quite expensive! Thanks!

Topic by Designer Dan 7 years ago  |  last reply 7 years ago


How do I power a spectrum analyser?

I want to make an audio spectrum analyser using 8 lm3915 IC chips and 4 TL072 chips with a TL071 amp for the TL072 chips. The TL072 chips will be wired into bandpass filters of different frequencies, which will output into the individual LM3915 chips. These ICs will be wired as VU meters. The outputs will be these LEDs: http://www.rapidonline.com/Electronic-Components/5mm-Round-Diffused-LEDs-with-Integral-Resistor-518908 I would also like to add a feature of adding a feature where when the ambient light is lowered, more lights turn on using another LM3915 chip. Another feature I would like to add is an amplifier and I want the spectrum analyser to respond to background music via a microphone and a pre-amp. The circuit I am going to use is: http://stavebnice.postreh.com/picture/PT041_schem_v.gif Finally, I would like to ask If this is plausible and what power supply should I use? It must be able cope with the power demands of these features. The power supply has to be from rapid electronics, because my school can only buy from rapid. Also, I would like to know what power amplifier I should use (25w, 30w, etc). Thanks! (I don't want to use microcontrollers, because I want to make my spectrum analyser look cool by showing the electronics (microcontrollers look simple) :)

Question by knektek 6 years ago  |  last reply 3 years ago


iPods as scientific tools (app-creation challenge)

I can't help noticing that there are a lot of kids with iPods at my new school. I have a half-warmed idea that this is an under-exploited resource - these things are packed with sensors that most schools cannot afford to buy for themselves. Does anybody know of any apps that can be used to easily access this data in a form useful for students?  For instance: the iPod replaces the bob in a pendulum and records the time it takes to swing, and the forces acting at each moment of the swing, then displays the data in a graph on the iPod, or uses the wifi link to email the document in a form that can be used by an Excel spreadsheet. And not just acceleration and time, but sound and light (isn't there an ambient brightness detector in there somewhere?). Suggestions? Any recommendations? Edit Kitewife bought me an iPod Touch for Christmas!  I have so far installed the following apps that use the on-board sensors; SPARKvue (accelerometer display), Signal Gen (an audible signal generator), SoundLevel (a free decibel meter / sound oscilloscope) FreqCounter (displays a continuous full-screen oscilloscope display Decibel 10 (analogue & digital sound level meter, which will email data for you) SpiritLevel & iTools (for measuring angles and levels by moving the iPod) Protractor (lays a protractor over the view through the camera, allowing you to measure "real" angles you can't reach (say, of a roof-line, or between branches of a tree). What I cannot find (yet) is a decent app that gives a class-room-useful read-out of light levels - they don't tell you the light-level, they tell you what f-stop to use on your camera. The next job is to find ways to use them in lessons, or as homework tasks. Question: Is anybody reading this able to actually create their own iPod Touch apps?  The apps I've downloaded so far are fine, as far as they go, but they really need a better way of getting the data out in a form that can be manipulated (eg by spreadsheets).

Topic by Kiteman 7 years ago  |  last reply 7 years ago


I need help writing a program on Lego Mindstorms EV3

Whattup y'all, I have a Lego Mindstorms project underway, but I can't figure out how to write the program. If somebody out there who is familiar with programming EV3 could help or give me some tips, that would be great!The project is as follows: I built a start/stop timer for micro drones (i.e., a Tiny Whoop) so you can measure your time around your course. Start the program by pressing the center button on the Smart Brick. The setup measures whether or not the drone is on the starting block with the color sensor (either ambient or reflected light intensity). After the drone leaves the starting block, a timer will be set. The timer stops after the drone hits the stop gate, which presses the touch sensor. The time is then displayed on the screen, where you can view it, and then the program is restarted by pressing the center button again.My problem is that I have no earthly idea of how to make a timer with the EV3 software. If you know how, then screenshot it and send it to me, and you will be rewarded with a great Instructable in the near future!Auf Wedersehen, and thanks in advance!

Topic by Thorondor95 9 months ago  |  last reply 9 months ago


57-Storey Death ray

Concave, polished, and 57 stories tall - the Vdara Hotel in Las Vagas could be the world's largest death ray... Reports are cropping up around the web that the smooth curved surface of the hotel focuses the Sun's rays into a patch around 10 feet across in the pool area, soon after noon. Fortunately, the glass disperses around 70% of the solar energy falling on it, otherwise lawyer Bill Pintas might not be here to tell the tale; After a brief dip in the hotel pool, Pintas was sunning on a recliner. He was on his stomach, relaxed, eyes closed. But suddenly, the lawyer became so uncomfortably hot that he leaped up to move. He tried to put on his flip-flop sandals but, inexplicably, they were too hot to touch. So he ran barefoot to the shade. "I was effectively being cooked," Pintas said. "I started running as fast as I could without looking like a lunatic." Then he smelled an odor, and realized it was coming from his head, where a bit of hair had been scorched. It was about 12:20 p.m., as best Pintas can recall. The hot-spot, which sweeps the entire pool area during the day, spikes at least 20 degrees above ambient temperatures, and has been seen to melt plastic bags and cups (made of plastics which melt at around 70°C (160F). Other guests, including newspaper reviewers, have also observed the burning beam. The hotel management doesn't call it a "death ray", they prefer the more friendly distinction "solar convergence phenomenon". Gordon Absher, a spokesman for MGM Mirage says the hotel is addressing the problem, and comments, "Because of the curved, concave shape of that hotel, they sometimes get isolated pockets of high temperatures." ---------------------------------- Never mind dispersing the light - get those windows polished up, and let's see how many lawyers a fifty seven storey burning glass can really deal with!

Topic by Kiteman 8 years ago  |  last reply 8 years ago


Question on using a Peltier/TEC device for air temperature control - Help please.

I want to have some control over the temperature inside the Orchidium I'm designing and I thought it might be cool :) to use a Peltier Device (device aka module) (Peltier aka TEC or Thermoelectric Cooler). I find I need a lot of help! (Please!) Alright, this isn't a completed Instructable, it's a plea for help, and maybe if the subjects lie in some of your fields of knowledge then we can all enjoy and learn from it. So, the Orchidium I'm designing is an acrylic case 24"W x 18"D x 30"High. It's to grow species orchids indoors in a microclimate, with LED grow lights, proper humidity, air movement and temperature control. (Of course, other critters would like the case, too: poison dart frogs, newts, carniverous plants, etc.. But I'm going to call it the Orchidium.) I've got it all pretty well planned out so that it can be built for a very reasonable price (yes, including the LEDs) and still be aesthetically pleasing and real purdy, too. All planned out EXCEPT FOR THE TEMPERATURE CONTROL. I was looking for some way to cool my case and I stumbled across Peltier devices in eBay. They are CHEAP, costing about $5 or more, depending on the Wattage, etc. The eBay sellers intimated that all you have to do is plug them in and the device gets ice cold. Later, with diligent web-study I learned that actually ONE SIDE of the peltier gets cold, while the other side gets hot. Also, you MUST attach a heat sink and fan to both (?) sides of the peltier. Also, that these devices are not ready to be plugged in; you must attach a DC power supply to them. Oh, another trick that these miraculous devices do is reverse their hot & cold sides when you reverse the polarity of their juice. Ideally, I would like a Peltier device with heatsinks, fans, a thermostat and a DC wall transformer attached... the Peltier/heatsinks/fans would measure about 2" x 2" x 6" and would be mounted in the sidewall of the Orchidium. When the temperature is 65-85F degrees the orchids are happy and the device is Off. But when the thermostat senses the internal temp going over 85F it turns on the Peltier, cold side inside, and so the inside of the case doesn't go up to 90-95F like mine does now; it cools the case a little. Conversely, for someone with chilly orchids or sneezing newts the thermostat would switch the Peltier to hot-side-in to heat the Orchidium a bit. The retail cost for us to buy a Peltier device, 2 heatsinks w/fans and a DC transformer is cheap... roughly $30. The thermostat might be cheap, but I don't know enough about what's needed. If it's too expensive then the Orchidium can do without it. I was hoping I could find an off-the-shelf Orchidium cooler/heater. No such luck. These miraculous Peltier devices are still practically undiscovered -- relatively speaking. People want to use them to cool their computer chips but are hampered by condensation; my orchids welcome condensation. Pathetically, it seems the most common use for Peltiers now is to cool/heat the little boxes on your car seat... they plug into your cigarette lighter and keep your 6-pack cold. Come on! You folks at Instructables can surely help me figure out how to best make an Orchidium cooler with this barely-discovered and poorly-utilized device. I started out a few weeks ago writing to many of the Peltier manufacturers around the world in hopes they might help me in choosing which of their modules I might purchase for my Orchidium. None of them was any help. They wanted to know how many million Orchidiums I planned per year. They told me my basic plan was hopeless or inefficient cost-wise. A Swedish company wanted $800. An American company wanted $500. Some other company wanted $5,000 to $8,000. I wrote back and said I could get a Peltier on eBay for five bucks. The Swedes snottily claimed that their Peltiers were very high quality. No. No way is any svensker Peltier $795 better than ANY other Peltier in the known universe. They both get cold and grow ice crystals on one side. I just need to cool the case A LITTLE BIT, like from 90 to 80 degrees Fahrenheit. I am not trying to make a refrigerator or freezer. The case (Orchidium) is large, at about 7.5 cubic feet, and there is practically no insulation. Acrylic provides a little insulation, that's all. The temp of the interior of the case is derived from the ambient room temperature of your house... and the lights... which is why I designed it with LEDs. There is a constantly-operating muffin fan inside the case to provide air movement for the plants, but it does not provide any evaporative cooling since it's a closed case. So, first off what size Peltier do you recommend... do you think a 40 Watt would be enough, or what? Next, the placement. I envision the Peltier device mounted vertically through a hole in the side of the case. It might be a plan to mount it in the ceiling, but remember that the LEDs take up most of the ceiling. Next, the heatsinks. I confess I'm not totally clear on this, but I "think" that 2 heatsinks-with-fans may be needed, with one sticking out the outside and the other inside the case. I went ahead and got 2 heatsink/fans from Newegg for supercheap ($1 after rebate), but they aren't really what I want. They're actually shaped to fit some AMD chip. What I think I need is a copper heatsink with a flat bottom a little bigger than the Peltier, and fins... and a heatsink fan attached... and some way to attach it to the Peltier, and through the case to the other heatsink. See? Simple... well it should be but I can find nothing. Next, the power supply. I know it has to be DC, but I don't know which brick to get. I did find a bunch of DC or AC Wall Transformers for sale at alltronics... around $10 or so. All that stuff would be enough... at least to test the cooling power. But if we want to go whole hog then the icing on the cake would be thermostatic control of the Peltier. Well, I throw that out in case one of you is sharp in that field.

Topic by Knuten 11 years ago  |  last reply 8 years ago