Ultrasonic Range Finder

Without using a microcontroller, my group of four was challenged to design an ultrasonic range finder circuit that can measure distances from 10-99 ±1 cm and display the output on 7 segment LEDs. With a combination of 555 timers, operational amplifiers, counters, logic chips, and piezoelectric transducers, our group was able to create a working breadboard circuit in four weeks that met all requirements.