Description: A blog about the Raspberry Pi by Steve Jones, a computer programmer from the UK
blog (28659) raspberry pi (506) pi (377)
In a previous post, I mentioned that you need to use a resistor when connecting an LED to the GPIO, but how do you know what value resistor to use?
The reason we need a resistor is because the LED will only stand so much current before it blows.
There are 2 output voltages from the GPIO pins, 3.3v from pins 1 and 17, and 5v from pins 2 and 4.