Question

Engineering challenge Imagine you already graduate as a system design engineer and working in a company. One day your manager came to you and said: We have a business client that owns a shop and he wants to design a small electronic device that count the total number of client entering his shop daily. He knows that the total number of visitors never exceeds 99 visitors. The reason of his request is to know the ratio of how many buyers related to how many visitors.

Available components
1- 74LS 93 or 74LS 90 or equivalent as asynchronous BCD counter
2- E3F-DS30C4 Proximity Switch Photoelectric Sensor Switch NPN or equivalent
3- Two digit displays
4- Breadboard and wires if needed

Design requirements
1- Compact design
2- Clean and high quality connections
3- Trainer kit 7 segment two digits displays can be used.

Answer 1

To design a small electronic device that counts the total number of clients entering a shop daily, you can use the available components like the 74LS93 or 74LS90 asynchronous BCD counter and the E3F-DS30C4 Proximity Switch Photoelectric Sensor Switch NPN. Connect the Proximity Switch to the BCD counter, which counts the number of pulses received and converts it into a two-digit binary-coded decimal representation. Connect the output of the BCD counter to two-digit displays for the total number of clients entered.

Step-by-step explanation:

To design a small electronic device that counts the total number of clients entering the shop daily, we can use the available components such as the 74LS93 or 74LS90 asynchronous BCD counter, the E3F-DS30C4 Proximity Switch Photoelectric Sensor Switch NPN, and two-digit displays. Here is the step-by-step process:

1. Connect the Proximity Switch to the BCD counter. The Proximity Switch will detect the presence of a client and send a pulse to the BCD counter.
2. The BCD counter will count the number of pulses received and convert it into a binary-coded decimal (BCD) representation.
3. Connect the output of the BCD counter to the two-digit displays. The displays will show the total number of clients entered in a two-digit format.
4. Ensure that the connections are clean and of high quality, using the breadboard and wires if needed.
5. Test the device to ensure it accurately counts the number of clients entering the shop.

This design meets the requirements of being compact, having clean and high-quality connections, and using two-digit displays.