Simple LED connection to pin 13 & GND is no longer working when I send "1" via Serial Monitor to turn LED on.
I can see onboard Tx/Rx LEDs blink and the onboard led "L" turns on when I send "1" via Serial Monitor to turn on LED.
No uploading errors
I try to use different LED, different breadboard, different pins and have the same result.
I try my second Uno board with the different pins, breadboard, LED. Same result.
Any suggestion ?
Thanks
Simple LED connection to pin 13 & GND is no longer working
No resistor? You fried the pin.
LED connection to pin 13 and GRN does not require a resistor.
quangdo1700:
LED connection to pin 13 and GRN does not require a resistor.
Yes it does.
Look at the schematic there is no internal resistor. There used to be in about 2007. It is a zombie fact that you dont't need a resistor, no matter how much you say it some idiot always believes you don't need one.
Grumpy_Mike:
It is a zombie fact that you dont't need a resistor, no matter how much you say it some idiot always believes you don't need one.
Too funny.
Although this myth seems to be propagated by the Arduino Team itself.
Take a look at the attached image from Massimo Banzi's book
"Getting Started with Arduino" down in the "blinking an LED" section.
I'm not a fan of this book, especially for beginners, which is who it is aimed at.
It encourages trial and error tinkering over true understanding and more practical
traditional engineering practices using a methodology
he calls “opportunistic prototyping”.
"The Arduino Way" is what he calls this philosophy.
In my opinion, this is doing a disservice to those trying to learn by encouraging
some very bad practices. It can also result in users burning up h/w as they do their
rapid "protyping" without taking the time to understand the basics of their h/w.
--- bill
