...and the other end connects to....with a resistor on one output
+V --.-----------------.
.|. .|.
| | | |
|_| |_|
| .---|>|---. |
|---| LED |---|
| `---|<|---' |
| |
__|/ __|/
|\ |\
| |
0V --^-----------------'
Say it needs 10mA to light up, and has a voltage drop of 2.2V. 5V power supply.It should be possible to use a bi-colour LED with Darlington drivers providing suitable pull-up R's are used ...
Don't forget the transistor collector to emitter volt drop - say 0.2V is transistor driven to saturation.Say it needs 10mA to light up, and has a voltage drop of 2.2V. 5V power supply.
A 280 ohm resistor would let the LED work, and shouldn't get too hot (disipates 0.028W)