| ??? 10/23/10 18:25 Modified: 10/23/10 18:30 Read: times Msg Score: -1 -1 Didn't Search First |
#179301 - Relays ON for some moment as MCu power up |
I am a electronics hobbyist. I am driving 8 relays through ULN2803 from Port0.
As the system power up all the relays goes ON and make a noise "TICK" and after some moment return OFF. but I don't want this condition. To avoiding this condition I wrote my code as following... void main (void) { Initialise( ); ------- ------- void Initialise(void) { Relays = 0; //Relays ( Port0 ) Off ------- ------- } but my problem could not solve. I want that relays should remain OFF as system startup/powerup. I am using AT89S51, Crystel 11.0592MHz, 12V SPDT relays. Power supply circuit also attached.  |
| Topic | Author | Date |
| Relays ON for some moment as MCu power up | 01/01/70 00:00 | |
| Covered in many previous threads! | 01/01/70 00:00 | |
| Inverted signals | 01/01/70 00:00 | |
| you need to read .... | 01/01/70 00:00 | |
| Problem solved but... | 01/01/70 00:00 | |
| No, it is not | 01/01/70 00:00 | |
| No, it is not! | 01/01/70 00:00 | |
Reset & Watchdog Document | 01/01/70 00:00 |