Solar Light box

Hi, I would like to make a lightbox and charge it from a Solar cell . I saw a 5v ledstrip online , but I am wondering wich battery and wich Solar cell I have to buy? I mean how much voltage en watt does this ledstrip need? Wich diode do I need?  Another question: I want the Solar cell to charge during the day and I need it's power during the night , do I have to do something special with it ? I mean in the most cases you will have the energie richt away, that is not my plan .... I rather not use an on and of switch , I want to use it automaticaly.    I  just started with the diy adventure? Forgive me :)  greetings deborah

Posted by DeborahM8 2 years ago

Can I power a 5M 5050 RGB led strip with a pc PSU?

I would love to control an RGB led strip with an Arduino, it would look great on my desk. I would love to know wether I could power this strip using an old desktop powersupply. LED strip: PSU: I want to be able to either power the strip directly and control it with an arduino using a mosfet, or plug it in to the box to control the colours with the ir remote that comes with the strip. I probably won't use the entire strip at once, but I think I'll use 3M or less. It would be great if you could help me!

Asked by FlorianS20 2 years ago

Why is my RGB led strip giving lots of problems?

Hi,      I'm working on project with RGB LED strips with my arduino and a ATtiny84. Basically, what I plan to do is attach the strip to my display cabinet and attach the strip to an ATtiny84 microcontroller which will program the lights. Doing this I have encounter a few problems. As I haven't receive my ATtiny84 chip from the store yet, I'm testing everything on my arduino first. I first attached a normal single RGB LED to test all my programs and it works almost fine.       My first problem was when I attached 3 potentiometer(pot) to the arduino to control the intensity of each pin(red, green, blue). It did as it suppose to. When I turn the knob the brightness increase but as I'm reaching its maximum it drops back low again. So basically as I turn the knob gradually increasing, the brightness increase gradually from zero to it brightest then drops. I have attached a screenshot of this program below. I think it may be the connection between the pot and the arduino as they are quite sensitive but I'm not sure.       My second problem is when I replaced the single RGB LED with the RGB strip, MOSFETs(TIP120) and an external 12V supply it worked like before. I attached a couple of pictures of the layout below. However, when I set all the pins to low brightness the red and blue is turned off but the green led did not. The green led is dim but not completely turned off like the others. Why is this so? I'm very sure its not a defect in the strip. I hv also a attached a picture below of it.       My third problem is when I bought the three MOSFETs from the store I got one slightly different one although with the same label of TIP120. I have also attach a picture of the MOSFETS below.  The pin that is connected to this different MOSFET seems to act the opposite of its values. As in when I set that pin to low brightness it will be bright and vice versa unlike the other two. I can easily buy another one but I would like to know why this happens.       This is not really a problem but more of a question. As you can see I attached a 1k ohm resistor between the MOSFET and the arduino output to limit the draw of current. I would like to know what would you recommend the value of the resistor because I do not want to damage my chip. Is 1k enough?       My second question is I'm using a 12V 2A power adaptor as my power supply and a L7805 voltage regulator to provide a 5V power for my ATtiny84. However when I connect it I do not get a stable output and its value is around 5.3V. According to some videos I should attach a 0.1 microFarat electrolit capacitor to the input and a 22 microFarat electrolit capacitor to the output in parallel, however when I do so my output is still not stable and is around 5.8V which is too high for the chip as the max Vin for the chip is 5.5V. So what should I do?       My third and last question is my power adapter heats up when its powered but not connected to the circuit. Why is that? And my MOSFETS and voltage regulator gets hot occasionally. Should I attached a heat sink? Is this circuit possible to be left on 24/7? and how much power will it consume?       Sorry for the long post, I'm fairly new to electronics and I'm just a student  who is trying to learn electronics on my own. I have been working very hard on this project and I hope I get the best out of it. Sorry for the bad english too. Any help and comment will be much appreciated. Thank you very much!!

Asked by KhayhenS 2 years ago

Piezo Triggered LED lighting with a twist!

Hi There are already a few threads and topics on this site explaining how to hook up a piezo triggered light strip, however I'm looking to build a custom drum kit with particular lighting system and i can't find the info I need to build it. Inside the drums I want a constant, static colour of my choice on the led strip (e.g. blue) and then the piezo trigger triggers that LED strip to to different colour (e.g. red) for a quick flash and then back to blue. I would also like to have control over which colour combinations I use, so if i want yellow drums with green flashes, i would hopefully be able change that with a remote. Is there a circuit or a mod of an existing circuit that will handle my needs? Cheers, Owen

Posted by oesheppard 3 years ago

Raspberry Pi 3 Interactive Led Strip Wall

At the moment we're working on an interactive led screen wall for the entrance hall of our new studio. I've setup the following frame (  with 17meters of WS2812B addressable led strips.We're using the Neopixel library for rasp ( and it works like a charm with the rasp 3. Anyway they next step is to control these ledstrips so they work as one big display. I had a look on the internet and a lot of people advices to work with the FadeCandy from Adafruits but I want to know if there are other solutions using only Python and write software to control the ledstrips. The purpose is to use the rasp's camera module like this guy did so when someone is entering the room, his reflection appears on the wall... Any information / tips / other solutions about how to achieve what I described above are welcome. Thanks

Posted by Fightbean 2 years ago

How to connect LED Strip to USB cable? Answered

I am currently making an Art assignment for my class. I am trying to crete art using light and I decided to use LED Strip instead of other lamp. I bought a 1 meter long for a prototype before installing the real one. I am cutting the LED for about 10 cm long. Now, how do I connect the rest of the LED to a USB cable? The LED Stripe comes with mod and controller, but I cannot purchase it separately. I dont want to buy another 1 meter long and only use 10 cm of it. How do I exactly connect this one to the USB? I tried to search the videos on youtube, but most of them are only having 2 area for plus and minus, but mine are having 4 area named R, G, B, and Com. I have no clue at all, so blind right now. I dont want to waste the rest 90 cm LED I dont use. If any of you know how to combine this, please help me! thank you very much! 

Asked by YosukeH 1 year ago