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DESIGN AND CONSTRUCTION OF AUTOMATIC HAND DRYER WITH TEMPERATURE DISPLAY

  • Project Research
  • 1-5 Chapters
  • Abstract : Available
  • Table of Content: Available
  • Reference Style: APA
  • Recommended for : Student Researchers
  • NGN 3000

ABSTRACT

This project work deals on the design and implementation of an automatic hand-dryer with display capable of drying up a wet hand inserted under its vent and goes off automatically as soon as the ands are removed.  The system also incorporates a decimal counting unit that displays the temperature of the blown out air in 0C.  This system is configured using an optp-coupler realized with cadmium-sulphide photocell (c.d.s) at the input.  The output of the sensor is conditioned by quad-2-input schmit trigger NAND gate (74132) which serves as the control logic used to trigger a one-shot delay that biases a transistor switch. The transistor commutes a TRIAC (solid state relay) that switches on/off the blower connected to it.  When a wet hand is inserted under the vent and blocks the line-of-sight of the sensor, the blower starts to blow automatically as long as the hands are still blocking the c.d.s, else it will stop.  The seven-segment display displays the temperature of the blown out air in 0C and resets simultaneously with the switching off of the dryer.  





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