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But a few days ago I connected the LEDs without a resistor and without a transistor(I connected the set LEDs), and everything worked fine, so do you still advice me to use a transistor and a resistor.
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I don't think you connected the grounds, Dave.
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I connected the LEDs without a resistor and without a transistor(I connected the set LEDs), and everything worked fine,
What you should say is "there was no immediate, visible damage to my AV microcontroller".
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Ok then I will use resistors, but I cannot use any transistors because I do not have any right now
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Ok, wire up your sets of resistors in parallel then with a resistor each, being sure the total current draw stays under 20ma.
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This is what I did, I used four transistors, for the 4 sets of LEDs and I added a resistor from the middle pin of each trasistor to the arduino.
And this works absolutely fine, no problems, and the current is about 18 on my ammeter.
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Sounds like you're on the path to success!
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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