This circuit very useful for to count the visitors entering into a hall or leaving from the hall, It will help us to find total number of people present in the hall. Keep in mind that the counter should be placed where only one person crosses at a time.
Circuit diagram
In this project we used CD4026 IC which is a Johnson decade counter and output decoder which converts the Johnson code to a 7 segment for one stage. Hence we used two CD4026 ICs for to get two digit output.
Construction model
Components List
| S.No | Name | Quantity |
| 1. | IC CD4026 | 2 |
| 2. | Seven segment common cathode LED | 2 |
| 3. | LDR (photocell) | 1 |
| 4. | Transistor BC547 | 1 |
| 5. | Push button switch | 1 |
| 6. | LED (white high bright) | 1 |
| 7. | Resistors 1KΩ 10KΩ 4.7KΩ 100Ω |
1 1 1 2 |
