why use a transistor when i can use the I/O pins of an ardunio Answered
i keep seeing explanations of the uses of transistors for electronic projects. but i dont understand why i would for example: use a npn as a switch for an LED when i could just program my ardunio to use to turn it on and off again? or use any micro controller for that matter.
thankyou in advance for your help im still new to eltronics