| ??? 05/12/06 16:55 Read: times |
#116115 - Datasheet!! Responding to: ???'s previous message |
Erik Malund said:
[a link to the bi-color LED datasheet] would help More than just help - it's essential! Is it a 3-pin device, with 1 common and another for each colour LED, or is it a 2-pin device with the two LEDs in anti-parallel? Obviously, this makes a difference to how you drive it! The 3-pin version effectively has 4 states: Off, one LED on, the other LED on, and both LEDs on. This would be easiest done with a common-anode LED and two port pins: the port pins sink the current for the required LED(s), and the opto supplies the anode. The 2-pin version only has 3 states: Off, one colour, or the other colour. This way, you need a kind of 'H' bridge arrangement to reverse the current, with the possibility for the whole thing to be OFF. |
| Topic | Author | Date |
| Interfacing a Bi-colour LED | 01/01/70 00:00 | |
| a link to the bi-color LED datasheet | 01/01/70 00:00 | |
| Datasheet!! | 01/01/70 00:00 | |
| LED info | 01/01/70 00:00 | |
| He is right, the Vf max for the LEDs you | 01/01/70 00:00 | |
| More info on H bridge? | 01/01/70 00:00 | |
| that is what a H bridge usually is used | 01/01/70 00:00 | |
| be careful, but roll-yer-own | 01/01/70 00:00 | |
| Why no use a DPDT 5VDC relay? | 01/01/70 00:00 | |
| LED go poof | 01/01/70 00:00 | |
| Port pin go POOF! | 01/01/70 00:00 | |
| ?` | 01/01/70 00:00 | |
| Two inverters | 01/01/70 00:00 | |
| darn | 01/01/70 00:00 | |
| YES! | 01/01/70 00:00 | |
| Third color possible? | 01/01/70 00:00 | |
| Very nice however | 01/01/70 00:00 | |
| Two NAND's? | 01/01/70 00:00 | |
| how many LEDs | 01/01/70 00:00 | |
| a slight problem | 01/01/70 00:00 | |
| dynamic refresh | 01/01/70 00:00 | |
sure, but | 01/01/70 00:00 |