Automatic hand alcohol dispenser without arduino or microcontrollers

CarlosVolt Tutoriales

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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Electronic diagram

PCB

TCRT500L

DESCRIPTION

The TCRT5000 and TCRT5000L are reflective sensors, which include an infrared emitter and a phototransistor in a lead package that blocks visible light. Package includes two mounting clips. TCRT5000L is the long lead version.

FEATURES

• Package type: leaded
• Detector type: phototransistor
• Dimensions (L x W x H in mm): 10.2 x 5.8 x 7
• Maximum operating distance: 2.5 mm
• Operating range within> 20% relative collector
current: 0.2mm to 15mm
• Typical output current under test: IC = 1mA
• Daylight blocking filter
• Emitter wavelength: 950nm
• Lead-free (Pb) released solder
• RoHS 2002 compliant / 95 / EC and in
accordance with WEEE 2002/96 / EC
APPLICATIONS
• Position sensor for shaft encoder
• Detection of reflective material such as paper, IBM cards,
magnetic tapes, etc.
• Limit switch for mechanical movements in VCR
• General purpose: where space is limited

TIP42C

  • Transistor Polarity: PNP
MAXIMUM SPECIFICATIONS
  • Total device dissipation (Pc): 65 W
  • Collector-base voltage (Vcb): 140 V
  • Collector-emitter voltage (Vce): 100 V
  • Emitter-base voltage (Veb): 5 V
  • Maximum DC collector current (Ic): 6 A
  • Maximum operating temperature (Tj): 150 ° C
ELECTRICAL CHARACTERISTICS
  • Current – Gain – Bandwidth Product (ft): 3 MHz
  • Continuous current gain (hfe): 20
  • Packaging / Case: TO220
UA741CP

characteristics

• Short circuit protection
• Zero offset voltage capability
• Large differential and common mode voltage

Ranges

• No frequency compensation required
• No blocking

Applications

• DVD recorders and players
• Professional audio mixers

Description

The µA741 device is a general purpose operating device.
voltage compensated zero capacity amplifier.
The high common mode input voltage range and the
absence of blocking make the amplifier ideal for
voltage follower applications. The device is
short-circuit protected and internal frequency
compensation ensures stability without external
components.

DIODE 1N4007

RESISTOR 10K

RESISTOR 150 OHM

RESISTOR 220 OHM

 

MOTOR

WATER PUMP (PREFERRED)

MACRO DRIPPER

POTENTIOMETER

EXPERIMENTAL PLATE

ARMED CIRCUIT ON EXPERIMENTAL BOARD

To put together this entire project, we can put it together on an experimental board like the one published above, or on a protoboard.

This is good for the experimentation stage, but once we have everything set up and working correctly, we must take the next step.

Subsequently, the final circuit was designed, and the gerber files necessary to order the printed circuit through.

Download this gerber file from here ->  Gerber_PCB_DISPENSADOR_DE_ALCOHOL

3D FILES

If you have a 3D printer, you can download the STL files, to print the pump and the bottle if you want to build, this hand sanitizer, or you can buy a submersible water pump, very cheap anywhere on the internet and use any plastic container that have unoccupied at home.

Download the STL file here ->  sanitizer

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