Development of a Working Ultrasonic Time-of-Flight (TOF) Prototype

This is a hardware development project. I require a fully functional working prototype, not a simulation, research paper, or theoretical design. The final deliverable must demonstrate ultrasonic TOF measurement... (Budget: ₹12500 - ₹37500 INR, Jobs: Arduino, Electrical Engineering, Electronics, Embedded Systems, Firmware Development, Microcontroller, PCB Design and Layout, Signal Processing)