Investigating Wireless Sensor Kit for Horizontal Circular Motion Analysis

Circular motion is a challenging topic in physics education, primarily due to the multiple quantities involved, such as linear and angular quantities, as well as Newton's laws of motion. This often leads to confusion among students. In this study, we developed an experimental device for uniform circular motion using an ESP8266 microcontroller, an IR sensor, an accelerometer, and a gyroscope sensor. The device consists of a microcontroller, sensors, battery, and metal block, which are connected to a circular plate. The device wirelessly transmits data to a preferred display device. We investigated the relationship between centripetal acceleration, angular velocity, and the radius of motion. The results revealed a direct variation between centripetal acceleration and both angular velocity and moving radius, consistent with the centripetal acceleration equation. Additionally, this device is cost-effective and provides students with real-time physical data on circular motion, making it a valuable tool for classroom use, thereby enhancing students' educational experience

A study of horizontal circular motion by using a wireless sensor kit

One of the most difficult lessons in high school physics is circular motion because of the necessity in relating the various quantities with physics formulas e.g., linear quantities, angular quantities, and Newton’s law of motion. Consequently, in this work we are presenting, we created a uniform circular motion experimental kit by using an ESP-32 microcontroller, accelerometer sensor, and gyroscope sensor. The proposed kit, which is composed of a microcontroller, sensors, battery, and metal block, is connected to a circular plate. This experimental kit can transmit output data to the display module wirelessly. The relationships between the centripetal force, the angular velocity, and changing the radius were studied. The results demonstrate that the centripetal forces varied as expected with the angular velocity and changing the radius. The advantages of our proposed kit are that the students can collect experimental data in real-time, and the overall price of our proposed kit is low. Finally, this kit is suitable to use in high school classrooms and we have found it useful for attracting students’ attention

Accessible biometrics: a frustrated total internal reflection approach to imaging fingerprints

Fingerprints are widely used as a means of identifying persons of interest because of the highly individual nature of the spatial distribution and types of features (or minuta) found on the surface of a finger. This individuality has led to their wide application in the comparison of fingerprints found at crime scenes with those taken from known offenders and suspects in custody. However, despite recent advances in machine vision technology and image processing techniques, fingerprint evidence is still widely being collected using outdated practices involving ink and paper – a process that can be both time consuming and expensive. Reduction of forensic service budgets increasingly requires that evidence be gathered and processed more rapidly and efficiently. However, many of the existing digital fingerprint acquisition devices have proven too expensive to roll out on a large scale. As a result new, low-cost imaging technologies are required to increase the quality and throughput of the processing of fingerprint evidence. Here we describe an inexpensive approach to digital fingerprint acquisition that is based upon frustrated total internal reflection imaging. The quality and resolution of the images produced are shown to be as good as those currently acquired using ink and paper based methods. The same imaging technique is also shown to be capable of imaging powdered fingerprints that have been lifted from a crime scene using adhesive tape or gel lifters