| ??? 04/24/06 12:17 Read: times |
#114875 - why on earth? Responding to: ???'s previous message |
if your 555 supply voltage is not same to microcontyroler voltage use of an optocoupler
why on earth use an optocoupler ? once a 555 is involved, everything is imprecise, so why not just use a transistor? OR if 5V in and 3v3 out there is the 74lvc4245. if 3V3 in and 5V out any HCT chip will do. Erik |
| Topic | Author | Date |
| EXTERNAL INTERRUPT USING 555 T0 89C51 | 01/01/70 00:00 | |
| why | 01/01/70 00:00 | |
| looks like homework ... | 01/01/70 00:00 | |
| maybe | 01/01/70 00:00 | |
| dont warry,, it is any one right .... | 01/01/70 00:00 | |
| Err ? | 01/01/70 00:00 | |
| Let himself find out | 01/01/70 00:00 | |
| Sweet... | 01/01/70 00:00 | |
| why on earth? | 01/01/70 00:00 | |
| You didn't know? | 01/01/70 00:00 | |
| Kai, I hope you are ironic with the abov | 01/01/70 00:00 | |
Of course! | 01/01/70 00:00 |