LED dimming and color temperature control (variable white LEDs)

I'm trying to find an inexpensive way to control a variable-white LED strip with knobs. There are tons of remote dimmers and wall-touch-controls available. These are way too complicated or too big for my application. All I want is two knobs. One that controls the brightness of the LED strips and one that controls the color temperature between the cold and the warm white LEDs I did some research and see two possible solutions: a) 100% analog using potentiometers and LED drivers or b) using potentiometers, Arduino, and LED drivers. Here are the details: a) Analog: - Use two LED drivers to drive the actual LEDs, like these ones: http://www.ledsupply.com/led-drivers/buckpuck-dc-led-drivers - Use two dual-channel potentiometers to control the brightness of the two different LEDs in the strips:   - One controls the brightness for both channels (connected to the same pins)   - One controls the relative brightness between the channels (connected to opposite side pins) b) Using Arduino: - Any Arduino with analog inputs - Two single-channel potentiometers connected to two analog inputs - Some software that generates the correct PWM outputs for the two LED channels - LED drivers that can dim using PWM signal input. According to this post, the same BuckPucks can do that, too: http://forum.arduino.cc/index.php?topic=14603.msg107089#msg107089 Do you have any advice on these options? Is there a third one or even an off the shelf solution? What about compliance and certification? If I use BuckPucks and other components that are certified, do I still need a certification for the whole system? (assuming I want to use the design not just for my personal pleasure)

Posted by smensch07 3 years ago


Color Shift Dimming LEDs

Dim an incandescent, and it produces a mellow, warm orange sunset glow. Dim an LED, with the same SCR dimmer, and it flickers at 60 hertz, still producing harsh blueish light. How can LEDs more closely mimic incandescents?

Posted by Toga_Dan 3 years ago


LED Reef tank light ( auto dimming)

I am in the process of redesigning a LED reef light using Luxeon III White and Royal Blue. These will let my coral grow the best. The biology of it I have down to a science... My circuitry however is still in its infancy. I have been following several of the instructables but i am at a point where I need some help... I can kind of get to the simple on off in my schematics (given I do not know what my power supply is yet) but as I read in Circuits-for-using-High-Power-LED , I now see that it can be a little more complicated if I want to preserve these slightly costly lights... So that leads to many questions from which most I might be able to get from the 12 books on electronics I purchased and borrowed, but something tells me that experienced people might have more practical solutions for me. What is needed to operate a 24 led array (Luxeon 3, Vf = 3.9V, 1000mA Each LED) from 115VAC to the DC? Now for a topic that I am having trouble with finding information to, back in the day I had an electronic ballast for a metal halide reef light that would fade on to full output over the course of 2 hours and would dim the same when turning off. this ballast had to cords on to supply constant power( i would assume) and the other to control the switch that would allow it to fade on and off.... I would like to simulate this sunrise sunset effect with my LED array? I appreciate your time and help with this project of mine.

Posted by Aquatope 10 years ago


Need help with this Led Flashing Circuit, 555 Timer

OK, The image bellow is what my circuit is looking like. Everything works fine, but I want to make it a dimming circuit instead of a flashing one. This is all being powered by a 9volt battery.

Posted by cris11368 8 years ago


Reviews : Motherboard Clock-Cum-Night Dim Arc Light !

Hi, I have created motherboard clock- cum- night dim arc light using old computer and mobile phone parts. Looking for some reviews and tips.  Please suggest. www.instructables.com/id/Motherboard-Clock-Cum-Night-Dim-Arc-Light-/ Thanks Richi

Posted by RichiV 3 years ago


How do I use a pot to dim an LED strip?

I have hooked up a 5k pot to this thing http://www.dealextreme.com/details.dx/sku.11304, and it dims it ok but1) how do I get a fuller range of dimming? it only dims towards the last 45 degrees. Any higher value (10k, +) gives worse results. Do I need 1k pot? Is there a way to make the 5k work better?2) even when the pot is all the down, the led is still dimly lit. Please make it go away.3) Do I need to use all three terminals on the pot?As you can tell from my questions, I am slightly above doofus level so please be kind.

Posted by darryllicht 10 years ago


Reviews : Motherboard Clock- Night Dim Arc Light !

Hi, Please refer to https://www.instructables.com/id/Motherboard-Clock-Cum-Night-Dim-Arc-Light-/ These are created using old computer and mobile phone parts. Please do feel free to express any types tips  or suggestion you  would  like to give. Thanks, Richi

Posted by RichiV 3 years ago


Dimming Leds and Potentiometers

Looking for a formula; I have a 24v 1.7 amp power supply ( http://www.allelectronics.com/make-a-store/item/PS-2417/24VDC-1.7A-POWER-SUPPLY/1.html ) to light 2 - 24v led strips ( http://www.allelectronics.com/make-a-store/item/LBR-24/24-WHITE-LED-LIGHT-STRIP-24VDC/1.html ). I want to be able to dim the led's from full power to completely off, but don't know how to calculate what size of potentiometer would give me the right ratio for dimming. IE, I don't want the LEDs to be completely off when the pot is only halfway turned. The urls are links to the exact products I purchased. Also, the power supply seems kind of large, and I still have to enclose it, so if anybody knows of a better and cheap path to get 24v that involves a little less potential for death, I'm all ears. Thanks!

Posted by bctour7 8 years ago


What is the best way to dim AC LEDs

I was wondering what is the best way to control a AC load with a Arduino. I am planning on building a Christmas lights display that will react to music that is playing. I would like to be able to control the rightness of the LEDs to. I know that Triacs are normally used to control AC loads but I've read that they supply inconsistent dimming. Another idea I had was to use a bridge rectifier to turn in to dc, then use a Mosfet to run it at like 10% duty cycle to avoid blowing the LEDs (Not sure if they could take the extended time under high load they might be subjected to). Then just increase or decrease the duty cycle to adjust the brightness. So all in all my question is will that work and is there a better way to do it.

Posted by supernoodle2014 1 year ago


Wireless controlled (bluetooth/wifi) dimming light bulb

Hello guys! I was wondering if there are dimmable light bulbs in the market that can be controlled over wifi or bluetoooth. I have an idea for a product and an app to control it. Can anyone help? Thanks a lot! Sam

Posted by samumar 5 years ago


help with dimming leds

I recently bought an rgb 12v led tape thats about 1 meter long and i want to attach it the bottom of my scooter. What would be the best way to put a dimmer on the leds? Do i need a PWM sort of a thing or can i just use a 100ohms pot?

Posted by shieldliger101 9 years ago


Smoking Pot(entiometer)

I have hooked up a 5k pot to this thing http://www.dealextreme.com/details.dx/sku.11304, and it dims it ok but1) how do I get a fuller range of dimming? it only dims towards the last 45 degrees. Any higher value (10k, +) gives worse results. Do I need 1k pot? Is there a way to make the 5k work better?2) even when the pot is all the down, the led is still dimly lit. Please make it go away.3) Do I need to use all three terminals on the pot?As you can tell from my questions, I am slightly above doofus level so please be kind.

Posted by darryllicht 10 years ago


Looking for Reviews : Motherboard Clock with dim arc light

Hi, Please refer to https://www.instructables.com/id/Motherboard-Clock-Cum-Night-Dim-Arc-Light-/  These are created using old computer and mobile phone parts. Please do feel free to express any types tips  or suggestion you  would  like to give. Thanks, Richi

Posted by RichiV 3 years ago


USB install of a 'pot' to dim or reduce the volume on a USB speaker

Hi Folks, Might someone know how to place a 'pot' into a USB speaker circuit?   I have one speaker, every time an instructional comes on, the volume is too loud, to soft, then I have to go to control panel to increase or reduce the sound. I figured that a variable pot might work. I have the pin outs for USB, 2,3 are D-, D+, 1 vcc, 4, grnd. I would appreciate your help, Thanks jack jackhg@sonic.net

Posted by hohum 6 years ago


Failing to ground a light fixture. Help

I asked my husband to turn a brass boat prop into a hanging light fixture. It doesn't seem to be Grounding because the light is very dim. Any ideas?

Posted by Cravinsalt 1 year ago


Breathing Lamp

Hi, does anyone know where to get a lamp that automatically dims on and off continuously or any suggestions with how to make one? I'm working on an installation project for a human scale lamp that looks like it is breathing. Thanks, Heidi

Posted by helloheidi 11 years ago


Attach LED's to (eye)Glasses with the Ability to Dim

Hello,   I'm trying to make eye glasses that are an indicator of how interested I am in what you are saying. (I'm not that big of a jerk, its for an art project ;) ) My idea is to put LED's around the frame that glow brightly when I am interested, and dim to nothing with I'm not.  It's just important to have the in between.  Ideally, this would be controlled by a slide switch dimmer.   The problem is that I really have no idea what I'm doing.  Is this possible? And could someone explain, in the most simple yet informative terms, how to make this work? Thank you!

Posted by JonathanLampron 7 years ago


Night light

I am looking for a brighter than 4w (incandescent) nightlight to plug into wall outlets in my hallway. I have tried a couple LED from Walmart and they are way to dim. Does anyone have instructions for one or a recommendation for a store-bought one.

Posted by foxwoodfarm 9 years ago


Airswitch Beaker Lamp - How does it work?

Can somebody explain to me how this "Airswitch Beaker Lamp" works? Specifically, how does the switching On/Off and the dimming function with just your hand waving over the top?Description from site:"Straight from the laboratory to your living room, the Airswitch beaker lamp makes the light switch obsolete. Simple movements of your hand across the top opening of the fixture turn the light on or off and dim the intensity..."Additional comment on site:"You raise or lower your hand above it to adjust brightness and wave your hand over to turn on and off."http://www.uncommongoods.com/item/item.jsp?source=family&itemId;=14254

Posted by sdtacoma 9 years ago


LCD laptop screen on XBOX

Hi, I have a broken laptop i would like to know how i can do to use his LCD screen on my XBOX. My xbox is softmoded so it would be a cool portable xbox. Thanks for your help and ideas. Dim

Posted by dimitri203 11 years ago


help: LED dimming via light sensor

I have been unsuccessful in finding a way to duplicate a "screen" with LED lights. where LEDs act like pixels.. whether a 10x10 layout or much more. and each of those LEDs have variable values of brightness. so thats the output... the input would ideally be video but i think im getting ahead of myself, so what about variable light sensors.. so if each sensor was attached to an LED, and if the sensor saw saw 50% brightness the LED would put out 50% brightness, dark sensor equals dark LED and bright light on the sensor meant bright output from the LED and as much in between as possible. any thoughts, opinions or suggestions? thanks, john.

Posted by thisendlessdecay 6 years ago


Battery powered 120V light bulb

I'm trying to build a steam-punk costume and wanted to use a motorcycle battery to power several edison squirrel cage style bulbs. Fortunately these blubs look better if they are dimmed, but what I'm having a problem with is a schematic and what type of transformer to use.

Posted by Deepeyes 6 years ago


Can't edit Instructable, Page says Updating but never finishes. HELP!

I'm in a quandary now. I was editing an instructable and adding an image to it from my image library when the page dimmed with the message "Updating" but it never finished. It's now stuck in that mode and I can't edit it. I tried another instructable I had started and get the same problem.  The screen is dimmed with the "Updating" text and busy signal and I can't do anything.  I can't even start a new instructable. I've closed my browser and reopened it. I've tried different browsers, nothing works.  I fear I may have lost all my work creating the instructable which took days.  My username is lauckstreet.  Can someone please help me and fix this problem. Thanks, Bob Hunt

Posted by Model Ship Builder 6 years ago


What type of solar cell/battery for a garden lamp?

I was looking at an instructable (https://www.instructables.com/id/Solar-Powered-Light-Graffiti-Projector/) involving a garden light hooked up to a red led instead of a white one. It shoots a picture out at night onto a wall or something like that.I'm wondering if the garden lights are too dim or don't charge fully. We used to have some lights of those type, but they would make a dim light for about 5 hours, then emit a very very weak light. I'm thinking about just buying a trickle charger from here, then getting a bright green or blue led, batteries, and waterproofing it. The problem is, I have nil knowledge about solar chargers/what voltage to use.Can anyone help?

Posted by Carmelite 9 years ago


My eyes are dim, I cannot see...

You may not know, but I wear contacts. They're monthly disposables - I can leave them in 24/7 for most of a month, as long as I go without for a coupld of day in between. Unfortunately, I seem to have lost my spectacles. Since last I wore them, I have been to Cornwall (other side of the country) and on cub camp (in a field). I fear my spectacles are lost somewhere between. Being massively short-sighted, I am consequently having trouble seeing things. I have "Ctrl+ed", but I still have my nose just a hand-span from the screen and key-board. So, if I accidentally post gibberish tonight, and the next night or two, blame it on the mole-eyes. UPDATE: I have a headache, g'night all.

Posted by Kiteman 9 years ago


how do I control brightness of RGB Led using PWM module

Hi,  I'm new to using Programming integrated circuit (PIC), I just acquired a PICKIT 3 made up of PIC18F45K20 Microcontroller. I'm need help understanding how to control brightness/ dimness of a RGB  led using PWM. The problem here is most tutorial I've come across only explain how to do this using one or more of the same type of led (same color). I need a tutorial explaining how to control brightness of red green and blue and whatever dimness state (say 20%) is, it remains in the same brightness when i pick a different color. if someone can direct me to a tutorial on how to configure RGB (not just LEDs) and using PWM. that would be much appreciated.

Posted by nigho4real 3 years ago


LEDs

Im trying to make a singe row 18 LED circuit, i used 18 random resistors that i salvaged from things (one for every led), i connected that to a 12v battery and only 4 light up, (1 out of the 4 are dim, the other 3 are good) what do i do to make all 18 light up. (the LEDs are blueish)?

Posted by Emomo 2 years ago


Car light dimmer

Hi all, Can someone show me how to make a car dimmer or point me in the right direction to make one. Just to recap this is like the new cars when you open the car the light fades up and when the car door is closed the light will take 5 to 10 seconds to dim out. Thanks in advance.

Posted by Dave-v-v 7 years ago


Arduino, Multiplexing, LED's and Resistors.

Ok ok. I'm rather new to electronics, had very minimal use with resistors. I could probably work out which resistor I needed for a series LED connection, but because it's multiplexing, it stumps me on whether it is a series or parallel connection. Pretty much, I'm wanting to run a 5x5 matrix, using these leds (information on it there), through my Arduino, I know some users here have Arduino, but the factsheet, with voltage and currents information is there.I am wondering, what resistors I'm going to need to use. If you could also say how you calculated that, it would be splendid. Is multiplexing connecting LED's in series or parallel?EDIT:I noticed the led link didn't work, but they have the following specs: How bright/dim is 3mcd? I'm assuming it's pretty dim...# Luminous intensity: 3mcd# Forward voltage: 2.1V DC# Forward current: 15mA

Posted by Noodle93 10 years ago


LED tail lights for a 6 volt Car

I have a 1964 Volkswagen beetle, the car still has its 6 volt electrical system, meaning all the lights are very dim. I would like to use multiple LED's in each tail light housing in order to make brighter tail and brake lights. Can this be done without converting the car to 12 volt ?

Posted by Woody4 6 years ago


Strange interaction with LastPass.

If I have "LastPass" - the password manager- enabled on FireFox, every single time the browser hits a page with a login, like the comments pages, or the forum, LastPass dims the screen and tells me it is logging in to the site. Any idea of what is going on ? Whose "fault" is it ? does LastPass not do some sort of handshake with you correctly or vice versa ? Applies to FF on Android too. Steve

Posted by steveastrouk 4 years ago


LED Blinking?

Excuse me Please: I would like to ask for some assistance in creating a circuit/project that will be for a plushy whose eyes would "blink" with on/off and/or/both the more creepy "blink" by dimming (down to 25% lit, back to 100%) of two LEDs I would guess a slightly more advance aspect of this project would be to put some randomness into the blinking. and the thought occurs to me that through the use of an ardrino, which I have zero experience with personally, would allow for the blinking, as well as sound reproduction too. {e.g. growls from the glowy-eyed wolf plushy} while I am trying to keep the plushy to a limited amount of complexity, and would like as simple a circuit to accomplish the blinking, the ardrino idea and the advanced features that could be given to the plushy I find very provocative,... but it is my ignorance which is not realizing what it is I am asking, so I would rely upon the collective experience here-in. Thank you kindly for the input and assistance. CAH

Posted by Ceyarrecks 2 years ago


Solar LED string lights too dim. Can I add another solar panel?

I bought two strings of solar LED christmas lights this year.   They don't get as bright as the plug-in LED lights I see around the neighborhood.  What I'm wondering is if it's possible to take some other cheap solar lighting fixture for the yard, and add the extra solar panels to my LED setup to give the batteries a better charge. While I was rewiring stuff, I'd also probably want to make the lead cord to the solar panel a bit longer so I had more flexibility about where I put the panels for optimal sunlight exposure.  I'm totally new to wiring adventures, so I don't know what would be needed to make sure all of this would be weatherproof.  I've searched here, and could not find an instructable on this topic.  Looking forward to seeing one added, or being directed to one if it already exists! -Alison

Posted by overboardgirl 7 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

Posted by Awesome-aniac 5 years ago


LED Light via USB?

Hi guys, I've been searching about, and this seems to be quite the vibrant community for DIY gadgets. I'd like to have as final product, a led light connected to a PC via USB - that has a software-controlled dim functionality (ie, 1 is on, 0 is off, values valid 1 < x < 0). I'm a seasoned programmer, but the hardware side of things has always been a mystery. Where to begin? Is this a complex project? Cheers. Alex

Posted by Saeven 11 years ago


LED light with different LED, run at differen currents

Hi All i need some help, I am looking to build a light with a string of 2 led's 1 string will be cree royal blue (XPE) running at 700mA, which should use about 3 volts per LED 2 string will be cree Cool white (XML) running at 1500mA which should use about 3 volts per LED Each string will have 13 LED's in it, I actually need to run 2 sets of these. I would like run a set of a single power supply. so the Blue and white would run in Parralal with each other, and the 13 LEDs would be in seriers. So it would be string 1 Blue (3x13) = 39 Volts at 700mA 2 White (3/13) = 39 Volts at 1500mA Then a repeat of the above if possible off the same power supply. to add to this i woudl like to be able to dim each sting. This dimming function can be manaul, and would only reaaly occur a few times, while I adjust teh light setting to meet my requirments. So with this all said, can it be done, which I am sure is the case. then how do I do it.? Many thanks Damon

Posted by wukkie 6 years ago


USB "charging done LED" circuit?

Does anyone have a very simple circuit (newb here) that can be used to indicate that a USB-based "charging is complete" or "is charging" (whichever is easiest). In other words, say if it's taking 200ma or more, light up an LED. Not a full charger btw, just something that I can plug in between anything - computer/car/ac-charger - and the device. This would be useful on devices that have no indicator at all or on things like phones that have their LCDs dimmed when charging. Thanks!

Posted by cowtip 8 years ago


Got a LED light bar, what to do...?

Http://www.ccs-grp.com/s2_ps/src/pro_item/1/1/3/114/1053/e.html So I got a a couple of these that I found at work...  Planning to use them for my fish tank.  Kinda worried that they will be TOO bright. Can I buy a dimmer to wire them up to?  I know very little about all this, I have a coworker that knows far more. But I was hoping to pick your BRa--IIA-NS!!!

Posted by benjaminleebates 4 years ago


L.E.D. Wall clock idea

I saw this clock design the other day. It was a circle with the clock hands in the middle and unattacked to the clock there were dots around it to mark the hours. I want to improve this design by making the hour dots light up on their respective time for the whole hour. Maybe make them have a nice dimming transicion between the hour switch at the last second. I don't know much about programming L.E.D.s or what hardware I would need. Can somebody help me how to make this project?

Posted by rabril 6 years ago


iPhone 6 with damaged backlight

I have an iPhone 6 with a backlight problem. The screen turns on with no light (I can barely see whats on the screen with bright light shined on it) but everything else still works on the phone. The touch screen works, apps work, it’s just the screen that’s really dim is what the problem is. Is this a filter that blew or is it the entire system? I have found a nice recorded solution: https://www.youtube.com/watch?v=R8BedLX7JAg but I would like to be sure that this is the correct issue. Anyone perform the repair which is shown on the video?

Posted by donaldlewis1802 10 months ago


Serial communication between PC and picaxe 28X2

Hi, I am having problem in communicating with PC with Picaxe 28x2. Please help me in solving this problem as it is a very important project My aim is to send the values of w1 and w2 variables ( values of the ultrasonic range sensors 1 and 2 ) to the PC and display them with the help of VB my picaxe code is ..., #picaxe 28x2 main: pulsout C.1,2 pulsin C.1,1,w1 pause 10 pulsout C.2,2 pulsin C.2,1,w2 pause 10 sertxd(#w1,#w2) pause 100 goto main and my VB code is , Imports System.IO Imports Strings = Microsoft.VisualBasic Public Class Form1 Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Integer) Dim WithEvents serialPort As New IO.Ports.SerialPort Dim PicaxeRegisters(0 To 1) As Byte Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Timer1.Enabled = True Timer1.Interval = 5000 End Sub Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick Call SerialTxRx() End Sub Sub SerialTxRx() Dim labelstring As String = "" Label1.Text = "" If serialPort.IsOpen Then serialPort.Close() End If Try With serialPort .PortName = "COM1" .BaudRate = 9600 .Parity = IO.Ports.Parity.None .DataBits = 8 ' 8 bits .StopBits = IO.Ports.StopBits.One .ReadTimeout = 1000 .Open() .Read(PicaxeRegisters, 0, 2) .Close() End With For i = 0 To 1 labelstring = labelstring + " " + Str(PicaxeRegisters(i)) Next Label1.Text = labelstring Catch ex As Exception MsgBox(ex.ToString) Label1.Text = "Timeout" End Try End Sub End Class I have not included the write command, since I have not included qualifiers in the picaxe code. The Picaxe chip is sending the values ( I used the terminal in picaxe programming editor to realise this) but the visual basic is not displaying me the actual values sent by the picaxe chip. It is showing random values instead ... So i think that there is an error in the VB code. PLEASE HELP AS SOON AS POSSIBLE .. Thank You 

Posted by santhoshR 7 years ago


Power supply help asap!

I am very disapointed. i just spent 4 hours working on a atx power supply. (look at my other forum post) i did everything they said. but whenever i turn it on and run it with something, it turns off. i noticed that when i hooked up the led to the green ad black wire, it was dim. and when my supply turns off, the led keeps on. what could be my problem? i put a 10 watt 10 ohm resistor in between the 5v line and the ground. any ideas. asap. thanks

Posted by DELETED_DELETED_kruser495 9 years ago


Waveform Generator

Hi guys! So actually i wanted to make a circuit that can turn on and off an LED array at a particular rate (say 10 seconds time period). I want the LEDs to gradually brighten and dim. At first i thought i can implement it using a multi vibrator, but it it turning off and on too fast, since the output of the MV is a square wave. I want to design a simple circuit that can generate more slowly rising waveform (like sine or triangular) and can also drive a load of at least 100 mA and have a time period of 10 seconds or so. Any suggestions? 

Posted by charmquark 5 years ago


Custom L.E.D. Sign???

I want to create my Greek letters alpha omega chi into an led light *the actual symbols*. and i need to know what parts i would need to make a sign that can be programmed to light up in various ways. i plan on using alot of LEDs and i want to program the light from the computer through the rs232 cable. and which program would be best for this what type of chip i should use one thats large enough to store the commands and possibly how to implement a switch on the light itself to dim the lights for night time.

Posted by altvater88 10 years ago


Ideas for "Consuming" Outdated LEDs

Hello all! I have many of Cheap and Outdated LEDs (In thousands) lying around. These were purchased long time ago (2003~2005) when luxeon Stars were hardly available and costed Rs 1000 a piece. These LEDs are- 5mm 20 deg White ~100pc 4.8mm "Straw Hat" Low dome 100 deg White.~ Many 1)Both of them are rated at 20ma, 3.2 volts. 2) Straw hats are twice as better (Life, brightness, Even-ness) than low beam angle 5mm ones 3)I learnt the hard way using these in many precious projects. Now I know very well that 5mm LEDs dim considerably even at 20ma after a year intermittent use. I had made 36-LED matrixes (about 2 watts) with good spacing between LEDs, Legs uncut still went dim after a year. 4)There is a huge variation in Tint, Voltage and output of these. Straw hats are better , but still 5)These are not entirely Cheap in money per-se. Costed 3 Rs per piece. Today a reasonable spec Chinese 350ma Star costs 40 a piece. If we consider a bunch of 18 of these to make that wattage, They add up to Rs 55 6)Advices to throw them in the bin/ Donating/ smashing with bulldozers./ Overvoltage Fun etc are not my idea. 7)Don't want to spend tremendous time/energy/money than they're worth.

Posted by bhvm 5 years ago


Arduino Controlled LED "Aircraft Runway" lights?

Excuse me Please: I have a project with a specific need, which I "think" an Arduino and LED strips can meet. The effect I would like is to have the LEDs all dimly lit, and have a single/few run along the length of the strip with increased brightness and returning to the dim intensity once past. think: aircraft runway lights. also, which I think may overly complicate the project, I need like ten strips all running concurrently, each with singular/few brighter LEDs running the length and randomly repeating. does what I explain make sense?

Posted by Ceyarrecks 1 year ago


Cold Cathode lamp with SOLAR power / battery?

I have an cold cathode lamp from a scanner. I want to install it behind a piece of artwork i made to sort-of backlight the image. it can be very dim... i don't need to get full brightness out of it. My question is.. do you think this is possible with a solar panel and rechargeable pack of some sort to dimly light this thing???? I really want to use solar on this, due to the nature of the piece itself. Any ideas on watts or volts or any other input??? On the power input for the scanner itself it reads 16VDC 0.9~1.0A... if that helps. any help or suggestions are welcome!!! thanks !

Posted by fleanine 10 years ago


Transistor help.... very basic, LDR/LED

I'm trying to make a very simple circuit to light an LED based on light from an LDR. I have all the components, it's a white LED, I'm using two AA batteries, and the LED glows brightly when I attach it to the batteries, but when I attach it to the LDR, it is either dim or dimmer due to the resistance... I'm sure I need to use a resistor for this... I have some assorted PNPs and NPN2222As... I've looked at a couple tutorials, but none of them seem to work... does anyone know how to do this without any (or as few as possible) other components? Thanks

Posted by perkinsb1024 10 years ago


BUGS BUGS BUGS

1. I am unable to post any images, the screen dims and nothing happens.2. I am unable to delete a post.3. I would love to be able to go back and edit a post - (EVEN Facebook allows this.)4. I (and several others ) would be more than happy to join a beta test groups working on bug catching in a sand box area and put the main site back to the last "working" version until most/all bugs can be resolved. - I am well qualified in this in that I was senior software test engineer in a previous existence and spent my time devising tests and finding bugs.

Posted by rickharris 6 months ago


Rear and front bikelights and road safety

A good bike rider learns from good and bad experiences during the initial rides. I pedal a bike on busy roads of my city. I realized that bikelights, especially the rear ones, are crucial for safety purpose. I got a backpack with solar panels and it has got a LED light as a rear bikelight, but it’s too dim, and the tail light sounds nothing like a good indicator for motorists. Either I would need suggestion on a bikelight safety kit or something else. I could do with my self-powered backpack. Is there is any DIY idea to replace it with a more bright option?

Posted by bikelightsuk 3 years ago