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Scoop.it!
Build the simplest $4 Automated Alcohol Dispenser without using Arduino. Keep your hands clean by filling it with liquid soap, hand sanitizer or with rubbing alcohol. By reducing physical contact, an automated dispenser keeps virus from spreading around in communal areas. 
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Scoop.it!
In this tutorial we will see how to create an automatic alcohol dispenser with water, to disinfect hands. It is activated by bringing your hand closer to the reflective infrared sensor tcrt5000l, whose signal is amplified by a ua741cp operational amplifier. The output of this integrated is connected to the base of the tip42c pnp transistor, which is responsible for controlling a direct current motor. The motor, together with other 3d-printed objects, create an electric pump, which is capable of supplying alcohol to our hands with a hose that can be taken from a macro dropper, used in medicine.
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