| ??? 08/09/08 15:21 Read: times |
#157354 - I like the up/down switch idea but.... Responding to: ???'s previous message |
One could very easily control two side-by-side seven segment LED modules with just eight (8) port pins [seven for the digit drives and one for the digit selection]. This scheme would require a simple timer interrupt driven multiplex scheme to alternately drive the two digits of the display at a hundred Hertz or so. This could easily be the same timer interrupt used to count out the long delay.
Michael Karas |
| Topic | Author | Date |
| timer | 01/01/70 00:00 | |
| Try an egg timer | 01/01/70 00:00 | |
| rather simple | 01/01/70 00:00 | |
| so google for NE555 applications | 01/01/70 00:00 | |
| More work with a 555 | 01/01/70 00:00 | |
| General Solution | 01/01/70 00:00 | |
| One step too far | 01/01/70 00:00 | |
| Don't overcomplicate! | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 | |
| 89C2051 fits the job | 01/01/70 00:00 | |
| Count your LEDs again | 01/01/70 00:00 | |
| I like the up/down switch idea but.... | 01/01/70 00:00 | |
| still there'll be 1 unused pin | 01/01/70 00:00 | |
| Surplus 7-segment digits. | 01/01/70 00:00 |