Audio Visual IR Sensor Tester
Most of the Remote control systems use TSOP 1738 IR Sensor module to control various functions. This IR Sensor is highly sensitive and may damage easily, if is supply voltage increases above 6 volts. This tester is useful to check the working of the IR Sensor. It gives audio-visual indications when the IR sensor is working properly.
TSOP 1738 is designed to sense 38 kHz pulsed infrared rays used in remote handsets.
The IR Sensor has a PN photodiode and a preamplifier stage encased in an epoxy case. The case acts a filter and allows only IR rays to pass through it. The sensor is equipped with an AGC, band pass filter, a demodulator and a control circuit. The output of the sensor has a bipolar transistor with 80-100 K resistor in its collector. The output gives 5 volts at 5 mA current in the standby mode and the output sinks current when the sensor gets pulsed IR Rays. This sensor is capable of continuous data transmission up to2400 bps or more. The band pass filter and AGC circuits suppress unexpected noise to prevent false triggering. The sensor responds to the IR rays only if the carrier frequencyis close to the centre frequency of the band pass filter.
Fig. 1: Image of TSOP 1738 IR Sensor
The IR Sensor tester is powered by two 3 volts lithium cells. The sensor module is tested using the Test socket. Alternately you can use 3 mini alligator clips for on board testing. When the switch S1 is turned on, LED and buzzer remains off, if the IR sensor is good. When the remote handset is focused on to the sensor, and any of the buttons is pressed, LED blinks in sympathy with the pulsed IR rays and buzzer beeps. This indicates that the sensor is good.
A good sensor will give high output when it is not receiving IR rays. This high output makes the cathode of LED and the negative of buzzer high and they remain off. When the output of the sensor turns low by receiving the IR rays, LED and buzzer turns on.
Fig. 2: Image of a Button Cell Battery
Use a 3-12 volt mini buzzer and 3 mm LED to make the gadget compact. It can be enclosed in a small case.
The Title Page should be the first section of your project “Audio Visual IR Sensor Tester”, providing essential details like the project title, your name, your supervisor’s name, the institution, and the submission date. After that, the Abstract offers a brief summary of your project, touching on its purpose, methods, results, and conclusions in 150-300 words. The Acknowledgments section is where you can thank those who supported your research, such as your supervisor, peers, or organizations that provided resources.
Next, the Table of Contents organizes the Audio Visual IR Sensor Tester by listing its chapters and sections, along with page numbers for easy reference. The List of Figures and List of Tables help guide readers to specific visual elements like graphs, charts, or tables included in the document. There should also be an Abbreviations and Glossary section to explain any specialized terms or acronyms, making the content clearer to readers unfamiliar with the technical language.
The main body of the Audio Visual IR Sensor Tester should start with the Introduction, which provides background information, outlines the research problem, states your objectives, and gives a brief overview of your research methods. Following that, the Literature Review offers an in-depth look at previous research relevant to your project, identifying gaps your study aims to address. The Methodology section then explains the research design, tools, and data collection methods you used to conduct the project and analyze the data.
In the Results and Discussion section, you present your findings and discuss them in relation to the Audio Visual IR Sensor Tester research questions or objectives, often using tables or charts to help explain the data. The Conclusion summarizes the key results, discusses their implications, and suggests possible directions for future research. You may also include recommendations based on your findings, offering practical advice for improvements or applications. Finally, the Audio Visual IR Sensor Tester project should include a References or Bibliography section to list all the sources you cited, as well as Appendices for any additional material. A Statement of Originality is often included to confirm the authenticity of your work