 |
| This Counter is designed with AT89C2051 Microcontroller and 3 digits common Anode multiplexed display, One BCD to 7 Segment decoder IC 74LS47 is used to decode BCD signals to 7-segment. Port P1of microcontroller is used to 4 BCD signals and 3 digit signals,7 pins are used pin P1.4 is not used. See the schematic circuit diagram below. 3 Nos of PNP Transisters BC556 are used to drive digit.Port pins P1.0 and P1.1 are always pulled up to +ve signals.Port pin P3.0 is used as input. in the cicuit diagram it is shown with cam switch.software 7-seg.bin can be downloaded. Pl E-mail me for any bug or suggestion |
| 3 Digits Counter |
 |
 |