| ??? 09/29/05 17:27 Read: times |
#101735 - Led problem Responding to: ???'s previous message |
try to drive the leds thru transistors.
you can turn on or turn off the corresponding transitors thru 8051 pins. in case you are using LTS542A led cells the following voltage and current values for each segment will help you to design appropriate collector(or emitter) resistor current= 10mA voltage= 1.5V |
| Topic | Author | Date |
| 8051 port problem | 01/01/70 00:00 | |
| Which port? | 01/01/70 00:00 | |
| Port current | 01/01/70 00:00 | |
| 8051 port problem | 01/01/70 00:00 | |
| Just look at this: | 01/01/70 00:00 | |
| NPN? | 01/01/70 00:00 | |
| schmitt trigger | 01/01/70 00:00 | |
I guess you are referring to the hex | 01/01/70 00:00 | |
| Have you tried BLINK? | 01/01/70 00:00 | |
| checked the MCBx51 board | 01/01/70 00:00 | |
| Connect as shown | 01/01/70 00:00 | |
| Led problem | 01/01/70 00:00 |