Light Sensors: Turning a Laser Pointer into a Hi-Tech Tripwire

People prefer to do things outside the home, such as taking care of themselves, outdoor activities until late at night, and generally unkempt house conditions, greatly increasing the likelihood of community crimes that include outdoor activities such as light maintenance, outdoor activities until late at night, and generally unkempt house conditions, greatly increasing the likelihood of criminal acts. Automatic technology is the solution to this problem, a type of household equipment that can be cleaned and maintained automatically. A descriptive approach is used, where researchers use reliable and systematic data to describe a phenomenon. for the use of Arduino Uno software that can provide instructions to turn on and detect lights. As an automatic indicator, the light sensor connected to the relay is very sensitive to the light resistance measured by the light sensor. The bulb will turn off automatically if the light sensor detects a number of more than 200 at the beginning of the day. Automatic lights can be operated via a Light Dependent Resistor (LDR) sensor so that the lights automatically turn on based on the resistance value measured by the sensor and timer. This is one way to develop a system in the event of a system disruption or seasonal rain. The timer can remember to adjust and set the lights as needed.

<div class="section abstract"><div class="htmlview paragraph">Based on the possible relation between the current method of organizing the control of available parking lots at the Santo André <i>campus,</i> of the Federal University of ABC (UFABC) and the development of car queues at the university concierge, the elaborated research project proposed the development of a prototype electronic system to control the availability of these parking lots, in order to identify the main characteristics of the implementation of this system. Therefore, through the development of exploratory and qualitative research [<span class="xref">3</span>], it was possible to elaborate an electronic form through the Google Forms platform [<span class="xref">10</span>] to obtain primary data [<span class="xref">5</span>] that made possible the implementation of the system. Then, a prototype was developed through the Open Source platform [<span class="xref">1</span>] Arduino [<span class="xref">6</span>] as the prototyping platform, the use of electronic components [<span class="xref">4</span>] for the system such as the Light Dependent Resistor (LDR) light sensor [<span class="xref">11</span>], resistors, Light Emitting Diodes (LED) and relay. The prototype uses the analog reading from the LDR to monitor the amount of light from each vacancy, whenever the LDR detects that a vacancy has its luminosity lower than a determined threshold, the Arduino switch the state of the relay, updating the status of the vacancy to "occupied", and if the luminosity is above the same threshold, the vacancy is set to "free". The prototype proved to be very helpful to manage the parking lot from UFABC since the Arduino can update the whole lot without any human interaction, a problem that the UFABC parking lot suffers since the vacancy control is done entirely by hand.</div></div>

Velocity is a physical quantity that is widely used in daily routine. The adverse utilization of the quantity makes the methods and measurement devices are necessary. The most common method to obtain velocity is by measuring the interval time of an object that moves at a certain distance. Usually, two light sensors (e.g., photodetectors, light dependent resistors or LDRs) are placed at a certain distance to detect the moving object and measure their interval time. This paper discusses the uses of a single LDR sensor to measure the velocity. LDR is a light sensor, which its resistance rises if the intensity of the light decreases. To measure the interval time, the light-sensitive part of the LDR sensor was partially covered (cover area 2.5 × 1.0 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ), which make the LDR has two sensitive areas. This allowed a single LDR sensor to measure the velocity of an object. The sensor responses when the object passing through it were analyzed from voltage to time graph. The experiment was done by passing by objects of different sizes ( 3.5 × 5.1 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and 3.5 × 0.35 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ). These size differences produce different voltage outputs so that the effect of the object size to the sensor responses can be analyzed. Also, by placing a cover that unequally divides the LDR light-sensitive part, the object motion direction could be predicted from the voltage to time graph pattern. The resulting output signal depended on the size of the object passing through the sensor, the size of the LDR, and the size of the LDR cover. The velocity calibration result exhibited a regression equation to calculate the velocity from sensor output, which was y = 3.99084 x + 0.15663, with x and y were the reference and measured velocity, respectively. Moreover, the sensor has a high precision on low-velocity measurement, which might be caused by the latency property of the sensor.

Terrarium is one of the interesting and environmentally friendly room decorative solutions. However, the owner must be more careful to pay attention to the optimal humidity and light conditions for the terrarium. In an effort to overcome these obstacles, this research makes an Internet of Things (IoT)-based automation control system for terrarium watering and lighting. The system is equipped with a humidity sensor (DHT22) and a light intensity sensor (Light Dependent Resistor) to detect environmental conditions. When abnormal humidity is detected, the system will automatically water the plants, while the lights will be adjusted to the light intensity of the room. In addition, the system data is presented in real-time through the website and displayed on the LCD screen. The test results show the accuracy rate of the humidity sensor is 97.45% and the light intensity sensor is 98.51%, while the ultrasonic proximity sensor has an average accuracy of about 98.61%. This research offers a practical solution for maintaining terrariums efficiently and effectively through the application of IoT technology.

Lights are one of the fundamental needs in the standard of living; if the light is cleared out, it'll squander power, and this often happens since you disregard to turn it off. in the list to fast improvement within the field of innovation the sum of power demand tends to extend quickly. This increment in demand can be caused by the expanding number of individuals utilizing electrical technology.In this case, a robotization light plan was made utilizing an Arduino-uno-based light sensor that can be set to turn on and off naturally, agreeing to the escalation of daylight so that it'll suit the desires of the lamp.The controller utilized is the Arduino microcontroller. The program connected to the microcontroller serves to initialize and design the equipment and examines the flag input from the light sensor, which at that point forms it is by being given a few conditions to create yield. In this case, a robotization light plan was made utilizing an Arduino-uno-based light-based Sensor that can be turned on and off, consequently concurring with the concentrated daylight received to suit the desires of the light.

Indonesia is an endemic area for the spread of one of the most popular ornamental fish, namely the largest betta fish in the world. In exploring their hobbies such as raising ornamental fish such as betta fish, efficient and automatic tools are more needed by betta fish farmers in aquariums today, when they have no free time or are drained by other work. This study aims to be a more automatic and efficient tool for everyone to feed fish, provide lighting, and drain aquarium water automatically, so that owners of ornamental fish do not have to worry about what ornamental fish need in the aquarium. The feeding system, in this case uses an Arduino-based control that controls the servo motor as an open and close system as the exit of fish feed into the aquarium. Aquarium lighting system, in this system uses a light sensor type LDR (Light Dependent Resistor). Automatic aquarium drain system, controlled by Arduino with water pump output. In the research, the LDR sensor will give a signal to the relay and give output to the 220 V lamp, that is, if the light intensity is below 028.7 Lux, which is above half past 6 pm and will turn off the 220 volt lamp if the light intensity is above 203.4 Lux, which is above 6 am. The servo motor will operate twice a day for feeding according to the betta fish feed needs, which is 2 times a day. The water pump will work every 4 days to drain the water automatically according to the turbidity of the water based on the time and number of betta fish in the aquarium.

Purpose of the study: The purpose of this study is to examine the effectiveness of a simple light sensor-based experiment in improving students’ experimental skills in physics learning, particularly in the topic of optics, among eleventh-grade vocational high school students. Methodology: This study used a quantitative experimental method with a one-group design. The tools included a simple light sensor based on an LDR, breadboard, resistors, LED, buzzer, and multimeter. Data were collected through observation sheets, product assessment, and student response questionnaires. Data analysis was conducted using IBM SPSS Statistics software. Main Findings: Students’ experimental skills reached a high level with a mean score of 81.61, significantly exceeding the Minimum Completeness Criteria score of 75 (p &lt; 0.05). All students successfully completed the simple light sensor experiment. Skill indicators showed an overall average of 86.67. Student responses to the media and learning process were very positive, with mean percentages of 87.07% and 86.90%, while product evaluation by teachers and observers reached 100%. Novelty/Originality of this study: This study provides new empirical evidence on the effectiveness of low-cost, simple light sensor (light dependent resistor)-based experiments in real vocational classrooms, focusing on direct measurement of students’ science process skills. It advances existing knowledge by demonstrating that affordable, hands-on experimental media can significantly enhance practical skills and learning engagement in physics education contexts with limited laboratory resources.

Image sensors combining an organic photoconductor with a-Si:H matrix addressing