Updated to add link to instructions on how to build one yourself
To help reduce the spread of the COVID-19 Corona virus (and most other types of viruses and bacteria), we designed a hand wash sensor to help us wash our hands for those 20 seconds.
See it in action here:
The hand wash sensor, but built with only off-the-shelf hardware - red blink for 20 seconds, then a green blink when done https://t.co/uQer8KtkzP #WashYourHands #HandWash #COVID19 @TXInstruments pic.twitter.com/J8gNJAhlUt— Thingsquare (@thingsqr) March 20, 2020
The sensor detects that someone is standing in front of the sink. Then starts to blink:
- A red blink for 20 seconds to indicate that we should keep washing
- A quick green blink to indicate that we are done
The idea is that this will help us keep the 20 second habit up.
The sensor also measures how long we wash our hands and reports this data
We previously built a version of the sensor with a custom piece of hardware, including a passive IR (PIR) sensor.
We now have designed a version of the sensor that uses only off-the-shelf hardware: the LPSTK.
The LPSTK has a built-in light sensor that we use for detection: if is gets slightly darker, we take this to mean that someone is in front of the sink. Likewise, if it gets slightly lighter again, we take this as an indication that the person went away again.
We use the wireless all-IP mesh network created by the LPSTKs both to report the hand wash statistics and to configure the hand wash sensor.
To make it more fun to actually hit that 20 second mark, the stats from each hand wash sensor are collected and displayed on a screen.
The data is also stored in the database so that we can compare different locations with each other. Which bathroom has the best hand wash stats? With the sensor, you will be able to find that out!
How to set it up
Installation is simple: just place the sensor behind the sink, so that the light sensor faces the sink. To make the sensor stick to the wall, a piece of double sided tape made for tiles can be used.
To access the stats from the sensors, an access point is needed, which can be built from a LPSTK and a Raspberry Pi.
Instructions for how to build this yourself are available here.
If you are interested in trying out the hand wash sensor in your office or place of business, you can also get in touch with us and we’ll be happy to help you set it up.
Download firmware files
The firmware files for the hand wash sensor can be downloaded here:
cc1352-serial-access-point-etsi.bin(For use in Europe)
cc1352-serial-access-point-fcc.bin(For use in the US)
Note that these are provided for evaluation purposes only and may not be used commercially (see full terms of service here).