Help me build this circuit with Arduino Uno R3!

Thread Starter


Joined Feb 12, 2017
I have an arduino uno r3 that runs on 5 volts. I'm trying to build something similar to
this circuit but I'm having a hard time figuring out what type of resistors, transistors, mechanical relay, and diode to get. The whole point of this circuit is to create a small repetitive pulse. I can't conclude what type of materials to get. Can someone please help me! I really appreciate it.


Joined Jun 4, 2014
You don't need a uno to do this. You need something simple like this and in fact for this circuit I don't think you even need the relay. The output of the '555 used direct should do the job.


Joined Jan 8, 2017
If you watch the video you will see that it gives you the code to load into the Arduino. It is just a variation on the LED blink code that is used in one of the first Arduino tutorials. You will have to pause the video to copy down the code.