AUTOMATIC HAND DRYER WITH TEMPERATURE DISPLAY
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AUTOMATIC HAND DRYER WITH TEMPERATURE DISPLAY
ABSTRACT
This project is about the design and construction of an automatic hand drier with temperature display capability that can dry a wet hand placed beneath its vent automatically. It includes a temperature detecting and displaying unit that shows the temperature of the blown out air.
This system is developed from the top down, with passive and active sensors (LM35 & LDR) at the input to measure temperature and hands, respectively. The signal conditioning unit, voltage comparator and frequency generator, and decimal counting unit comprise the control unit.
The output interface is made up of a transistor, a driver, an actuator, an electromagnetic relay, and a seven-digit display. The sensor is situated in front of the blower, and this device only dries with warm air.
When a hand is placed beneath the vent to block the LASER Diode and LDR’s line of sight, the blower activates and blows warm air. When the hand is removed, the blower stops along with the temperature display.
The hands must be opaque enough to impede the line of sight of the opto coupler in order for this device to work. This eliminates the tension, time, and risks involved with push button typing. As a result, an automatic hand dryer with a temperature indicator was created.
CHAPITRE ONE
INTRODUCTION
Engineering is concerned with initiatives that have a specific purpose in mind. Projects that can remove issues such as time lag, strem and energy consumption, expense, and environmental dangers/hazards.
This project work on the design and implementation of an automatic hand-dryer with temperature display is designed to avoid the hazards and problems associated with the manual hand-drying process and to display the temperature of the air used in drying the object.
This project combines passive and active components. It is also completely hardwired, as it does not use micro-program control.
1.1 GENERAL DESCRIPTION OF THE PROJECT
This project design and implementation of an automatic hand-dryer with temperature display is accomplished in a series of blocks that are all merged to make a single working unit.
The first block of the opto-coupler is made up of a laser diode and an LDR, and its output is conditioned by a 74LS132, which generates control logic. This control logic is utilised to bias a transistor switch, which activates the electromagnetic relay and switches the dryer.
The temperature display circuit is likewise triggered/powered by the control logic. This portion is implemented using an IC linear temperature sensor (LM35), the output of which is supplied to a quad-comparator with Hysteresis.
This comparator output resets a frequency generator, which is counted by a two-digit decimal counting unit, which displays the temperature of the blower’s air in degrees Celsius. The device uses a seven-segment LCD to dry the hand and indicate the temperature.
1.2 OBJECTIVE OF THE PROJECT
The primary goal of this project is to design and build an automatic hand-dryer with a temperature display. The initiative also aims to familiarise Computer Engineering graduates with electronic system designs using digital systems and random logic.
The project’s goal is to educate the young graduate on engineering ethics, technical and scientific writing, and the foundation of engineering professional practise. It is also intended to test/access young engineers’ abilities to complete engineering projects within a specific time frame.
1.3 SIGNIFICANCE OF THE STUDY
This project design and implementation of an automatic hand-dryer with temperature display represents a significant advancement in automation and control.
It is extremely important in CEE, EEE, Physics, and Electronics. This is a product that can be sold in homes and restaurants. If correctly adjusted, this project can act as a temperature control system for the server room, kiln, and ovens.
1.4 SCOPE OF THE PROJECT
The design and installation of an automatic hand-dryer with temperature display is the subject of this project activity. It covers the IC Liner Temperature Sensor (LM 35), the Opto-coupler employing LDR and laser diodes, the decimal counting unit, and the Quad-comparator (LM 339).
It covers the design’s additional passive and active components. The project also examines how the basic circuit parameters utilised in the design are calculated. This paper does not include the motor design utilised in hand dryers.
1.5 ORGANISATION OF PROJECT REPORTS
This project report is divided into five chapters to better clarify the stages involved in its execution. The first chapter contains the system’s introduction and aims, while the second covers the literature study and theories related to the project.
The third chapter concentrates on system design and analysis, while the fourth part examines system implementation, testing, and results. The summary and conclusion are covered in the fifth and last chapter.
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