| ??? 04/28/06 14:23 Read: times |
#115167 - Deja vu Responding to: ???'s previous message |
As soon as I connect the Base to p2.0, the relay gets active, without any control of mcu.
Oh, how often have we had that one. the reset state of any port pin is high before you do anything more, familiarize yourself with "the bible" and the datasheet for the derivative you are using. Erik here are the links to "the bible" Chapter 1 http://www.semiconductors.philips.com/acrobat/v...ARCH_1.pdf chapter 2 http://www.semiconductors.philips.com/acrobat/v...UIDE_1.pdf chapter 3 http://www.semiconductors.philips.com/acrobat/v...WARE_1.pdf |
| Topic | Author | Date |
| Trying to drive 12v relay using tr557 | 01/01/70 00:00 | |
| Search! | 01/01/70 00:00 | |
| !Search | 01/01/70 00:00 | |
| Use Darlington pair | 01/01/70 00:00 | |
| Specifically not ULN2002 | 01/01/70 00:00 | |
| What is tr557? | 01/01/70 00:00 | |
| Deja vu | 01/01/70 00:00 | |
| Do not connect PNP with 12V to port pin | 01/01/70 00:00 | |
| 12V relay with BC547 drive Thanks to all | 01/01/70 00:00 | |
Mr. Karas's Relay Drive Circuit | 01/01/70 00:00 |