| ??? 08/09/08 11:57 Read: times |
#157348 - 89C2051 fits the job Responding to: ???'s previous message |
Hello Mr.JPRao, are you from Hyderabad
instead of going into LCD display and matrix keypad, you can have 10 leds connected to the port pins of C2051, each led indicates time period (15s,16s....25s) and you are now left with 5 unused port pins, you can connect 2 buttons to 2 pins (one for select and other for start timer) if you press the select button,the timer period jumps from 15s to 25s also indicated by one of the 10 leds, after selection press start, now you can control a relay with one of the other 3 unused port pins, still at the end there will be 2 free pins regards arun kumar (nura1002003@yahoo.com) |
| 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 |