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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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.
• 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
• 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
- Transistor Polarity: PNP
- 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
- Current – Gain – Bandwidth Product (ft): 3 MHz
- Continuous current gain (hfe): 20
- Packaging / Case: TO220
• Short circuit protection
• Zero offset voltage capability
• Large differential and common mode voltage
• No frequency compensation required
• No blocking
• DVD recorders and players
• Professional audio mixers
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
RESISTOR 150 OHM
RESISTOR 220 OHM
WATER PUMP (PREFERRED)
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
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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