I am just starting out with an Arduino Diecimila and am playing around with LEDs, and am confused by why some circuits result in an LED not lighting up.
Yellow LED from pin13 to 16B on the breadboard, Green LED from 16A to GND. This works both LEDS light up.
Yellow LED from pin13 to 16A on the breadboard. Wire from 16E to 14E. Green LED from 14A to GND. This works and both LEDs light up.
Yellow LED from pin13 to 16A. Green LED from 16E to 14E. Yellow LED from 14A to GND. No LEDs light up. I would assume that all the LEDS are in series, and all 3 should light up, I assumed this would be exactly the same as my second successful scenario where the LED is acting the same as the wire.
Yellow LED from pin13 to 16A. Wire from 16E to 14E. Yellow LED from 15A to GND. Green LED from 16B to 14B. Here I have both Yellow LEDS lit, but the Green LED is not lit. I was expecting that the Green LED would have been in parallel and should have lit up.
In both failed scenarios I have swapped around the LEDs and proved that all the LEDs function.
There must be some basic concept that I am not understanding with the circuits, any ideas?