Arduino Forum

Topics => Product Design => Topic started by: hesam_m on Aug 07, 2020, 10:29 am

Title: Open Source Hand Sanitizer Dispenser with Arylic Enclosure
Post by: hesam_m on Aug 07, 2020, 10:29 am
Features



YouTube: https://youtu.be/OJgx_jHHoqU (https://youtu.be/OJgx_jHHoqU)


As we all know, the COVID-19 outbreak hit the world and changed our lifestyle. In this condition, alcohol and hand sanitizers are vital, expensive, and in some areas hard to find fluids, so, they must be used properly and efficiently. In the second version of the hand sanitizer dispenser device, I have addressed the previous design problems and introduces a device with no sensitivity to the ambient light and flow control capability of the alcohol/sanitizer. Therefore just enough amount of liquid will be poured on each request. The design uses a cheap ATTiny13 microcontroller.


(https://pcbwayfile.s3-us-west-2.amazonaws.com/web/20/08/06/1832127818335t.jpg)

(https://pcbwayfile.s3-us-west-2.amazonaws.com/web/20/08/06/1832425303310t.jpg)

(https://pcbwayfile.s3-us-west-2.amazonaws.com/web/20/08/06/1833138235303t.jpg)

(https://pcbwayfile.s3-us-west-2.amazonaws.com/web/20/08/06/1833469111544t.jpg)

(https://pcbwayfile.s3-us-west-2.amazonaws.com/web/20/08/06/1838297993645t.jpg)


References

Source: https://www.pcbway.com/blog/technology/Automatic_Hand_Sanitizer_Dispenser__Version_2___Using_ATTiny13.html (https://www.pcbway.com/blog/technology/Automatic_Hand_Sanitizer_Dispenser__Version_2___Using_ATTiny13.html)

[1]: TSOP1738 datasheet: https://www.batronix.com/pdf/tsop17xx.pdf (https://www.batronix.com/pdf/tsop17xx.pdf)

[2]: 2N7000 datasheet: https://www.onsemi.com/pub/Collateral/NDS7002A-D.PDF (https://www.onsemi.com/pub/Collateral/NDS7002A-D.PDF)

[3]: ATTiny13 datasheet: https://componentsearchengine.com/Datasheets/1/ATtiny13-20PU.pdf (https://componentsearchengine.com/Datasheets/1/ATtiny13-20PU.pdf)

[4]: BD139 datasheet: https://www.st.com/resource/en/datasheet/bd140.pdf (https://www.st.com/resource/en/datasheet/bd140.pdf)

[5]: 2N7000 schematic symbol and PCB footprint: https://componentsearchengine.com/part/1011182/model/download (https://componentsearchengine.com/part/1011182/model/download)

[6]: BD139 schematic symbol and PCB footprint: https://componentsearchengine.com/part/1041398/model/download (https://componentsearchengine.com/part/1041398/model/download)

[7]: ATTiny13 schematic symbol and PCB footprint: https://componentsearchengine.com/part/235118299/model/download (https://componentsearchengine.com/part/235118299/model/download)

[8]: CAD Plugins: https://www.samacsys.com/library-loader-help (https://www.samacsys.com/library-loader-help)
Title: Re: Open Source Hand Sanitizer Dispenser with Arylic Enclosure
Post by: Wawa on Sep 23, 2020, 06:45 am
I don't see why you're using a 2N7000. An Attiny pin is able to drive the IR LED/resistor directly.
A TSOP receiver is meant for interrupted IR signals, like remote controls.
Are you driving the IR LED with interrupted 38kHz?
AFAIK TSSP (not TSOP) receivers are better suited for constant 38kHz.
150-220ohm for the LED (~20mA) seems a lot of power for a few centimetres distance.
You could easily bridge 5 metres with that.
R4 is not needed. All TSOP/TSSP receivers have built-in pull up (~33k).
Leo..