As we all know, the COVID-19 outbreak hit the world and changed our lifestyle. In this condition, Alcohol and hand sanitizers are vital fluids, however, they must be used properly. Touching alcohol containers or hand sanitizers with infected hands can spread the virus to the next person. In this video, we will build an automatic hand sanitizer dispenser that uses IR sensors to detect the presence of a hand and activates a pump to pour the liquid on the hand. The intention was to find the cheapest and easiest solution and design a circuit. Therefore no Microcontroller or Arduino has been used. Two designs have been introduced and you are free to select and build any of them. The first design uses SMD components and the second design is even simpler. It uses DIP components on a small single layer PCB board.
YouTube: Hand Sanitizer/Alcohol Dispenser Circuit/DIY, Without an Arduino/MCU [Fight with COVID-19] - YouTube
References
Article: DIY Automatic Hand Sanitizer Dispenser, without Arduino or MCU - Technology - PCBway
[1]: AMS1117-5.0 Datasheet: http://www.advanced-monolithic.com/pdf/ds1117.pdf
[2]: LM555 Datasheet: http://www.ti.com/lit/ds/symlink/lm555.pdf?&ts=1589508422474
[3]: TSOP1738 Datasheet: https://eu.mouser.com/datasheet/2/427/introductionpartnumbers-1766653.pdf
[4]: NDS356 Datasheet: https://eu.mouser.com/datasheet/2/308/NDS356AP-D-1813031.pdf
[5]: AMS1117-5.0 Schematic Symbol and PCB Footprint: AMS1117-5.0 footprint, schematic symbol and 3D model by Shikues
[6]: LM555 Schematic Symbol and PCB Footprint: LM555CMMX/NOPB footprint, schematic symbol and 3D model by Texas Instruments
[7]: TSOP1738 Schematic Symbol and PCB Footprint: TSOP1738. footprint, schematic symbol and 3D model by Vishay
[8]: NDS356 Schematic Symbol and PCB Footprint: Component Search Engine - Free access to schematic symbols, PCB footprints and 3D models
[9]: CAD Plugins: Library Loader help - SamacSys
[10]: LM393 Datasheet: http://www.ti.com/lit/ds/symlink/lm393-n.pdf?&ts=1589509317025
[11]: BD140 Datasheet: https://www.mouser.com/datasheet/2/149/BD140-888626.pdf
[12]: LM393 Schematic Symbol and PCB Footprint: Component Search Engine - Free access to schematic symbols, PCB footprints and 3D models
[13]: BD140 Schematic Symbol and PCB Footprint: Component Search Engine - Free access to schematic symbols, PCB footprints and 3D models