Electronics > Beginners
Trying to understand voltage divider circuit
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Belrmar:
Quite a lot of arduinos have some kind of integrated voltage regulator , check what regulator it is, it should be able to work with 12V unless china does its thing
paulca:

--- Quote from: Youkai on April 26, 2018, 08:01:48 am ---It's going to be two of the segments of this: https://www.superbrightleds.com/moreinfo/flexible-led-strip-lights-color-changing/rgb-led-strip-light-flexible-custom-length-led-tape-light-with-9-smds-per-ft-3-chip-smd-led-5050/3502/

--- End quote ---

"9 RGB LEDs (5050 SMD) per foot.":  so that's 9 * 18 * 3 mA per foot = 486mA per foot.  If you are going for 3 feet you will need 1.5Amps to be safe.  This current is required to run it at full bright white.

Note the link you shared is for the 12V strip which uses less current due to the 50/50 SMDs being in series.  It will use about 9 * 18 mA per foot = 162mA (for full bright white).

I have a circuit you can use including gerber files for the PCB.  It will run the 12V strip from a 12V supply and power it's own ATTiny85 Arduino compatible microcontroller with a 5V regulator.  You can find the most of it here:
https://www.eevblog.com/forum/kicad/correct-way-to-show-screw-holes-for-manu/

If it is of use to you I would happily send you the project files, schematic and gerber files, with the bugs fixed :).  I'm not 100% sure if the schematic is on that thread, as I'm in work, but I can upload it when I get home if it's not.
Youkai:

--- Quote from: paulca on April 26, 2018, 08:50:02 am ---"9 RGB LEDs (5050 SMD) per foot.":  so that's 9 * 18 * 3 mA per foot = 486mA per foot.  If you are going for 3 feet you will need 1.5Amps to be safe.  This current is required to run it at full bright white.

--- End quote ---

Oh sorry; not 3 feet. 2 segments; as in the length shown in the image I posted above. The segment only has 3 LED in it. The final product is only going to be 30x20cm.
paulca:

--- Quote from: Youkai on April 26, 2018, 11:41:19 pm ---
--- Quote from: paulca on April 26, 2018, 08:50:02 am ---"9 RGB LEDs (5050 SMD) per foot.":  so that's 9 * 18 * 3 mA per foot = 486mA per foot.  If you are going for 3 feet you will need 1.5Amps to be safe.  This current is required to run it at full bright white.

--- End quote ---

Oh sorry; not 3 feet. 2 segments; as in the length shown in the image I posted above. The segment only has 3 LED in it. The final product is only going to be 30x20cm.

--- End quote ---

Ah okay.  The LEDs are 12V.  The easiest way to run them is to provide 12V straight to the strip also take the 12V through a 5V voltage regulator to the Arduino.  It will also be easier if you put the 3 segments in series so you only need one DATA pin to run them.  I recommend the FastLED library.
Youkai:

--- Quote from: paulca on April 27, 2018, 06:57:04 am ---It will also be easier if you put the 3 segments in series so you only need one DATA pin to run them.

--- End quote ---

Series would mean I would wire the R+G+B from one strip to the 12V of the next one correct? That would prevent me from having any color but white wouldn't it? I am going to want to have it do cool color effects so I need to be able to control the RGB led independently.

I'm going to use the smallest arduino I can which probably won't have enough PWM pins to run even 1 LED strip and the 3 servos for the project. so I'm going to use a PWM driver chip which means that the number of PWM pins is essentially a non-issue. Though if I can run the Red LED from each strip off the same pin that would save me some duplicate lines of code.
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