I have 2 LED strips with 6 LEDs on each. They use a 12V power supply.

My question, how can I use them like regular LEDs using Arduino UNO? Without any MOSFETS or transistors if possible.

And can I use PWM?

  • The only way is to cut out the individual leds an solder some wires to them, so you can connect them directly to the Arduino (with a resistor). – Gerben Aug 25 '16 at 18:12
  • Do you have a picture? And are you sure it's 12v? As 8 LEDs is a weird number. – Gerben Aug 25 '16 at 18:14
  • its 6 actually.. my bad @Gerben – YaddyVirus Aug 25 '16 at 18:19
  • That makes more sense. Two sets of 3 LEDs in series. – Gerben Aug 25 '16 at 18:35

It's not safe for the MCU without transistors or so.

You can use some kind of LED driver (for example TLC5940 with on chip PWM) or ULN2003 as 8 channel low side switch (instead of 8 transistors, PWM is possible if you do it programmatically) or many others.

With single transistor it looks like: enter image description here

Where R_1 can be about 1K and transistor can be any NPN that could handle led current.

  • so what transistor do I actually need? and in case I do use a transistor, how am I going to wire the enitre setup? – YaddyVirus Aug 25 '16 at 18:20

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.