If you still can't stop touching your face as the corona virus outbreak drags on?
For that NASA developed a open source sensor  design
vibrating necklace , called PULSE
The PULSE is a pendant that you can hang from your neck like a necklace
When your hand gets close to the device it starts to vibrate
That's supposed to remind you to stay away from your face zone.
Also it starts to  vibrate  when your hand gets close to your face
 
That's supposed to remind you to stay away from your face zone.
this design developed by NASA open source, so we can use this
design and we can  develop our own sensor and add more ideas to it
Using this NASA open source design , i created a face touching prevent sensor
In my sensor i added one vibrator motor also added one buzzer for this demo
this sensor is good for kids, because  they often touch their faces
this sensor is very easy to develop
Anyone can create this sensor
you can purchase the parts from any electronic shops  except one sensor called IR - Infrared Proximity Sensor
Already we have coronavirus measures, like hand-washing and mask-wearing. vibrating necklace to work with other
this sensor is good for kids, because  they often touch their faces
its simple sensor  anyone can easily develop
For this sensor demo, i created a face touching sensor with added one buzzer
Also added one vibrating motor to it
Central to the design  of my sensor is the infrared sensor unit
IR Sensor got 4 pins;  that provides a high (~3 V) output signal to pin 3 by default,
and drops low (~1 V) when the LED detector  receives a signal
indicating your hand (or other reflecting object) is in front of the IR sensor
When pin 3 in IR sensor goes low, it powers the PNP transistor  to energize
the motor  causing it to vibrate attached to the sensor .
it can detect up to 12 inches afar,
ie when we move our hand
sensor will activate immediately
i connected a buzzer just for this demo, you can connect  a vibration motor or  some LED
 
You need the following materials to build this face touching sensor
Infrared Proximity Sensor
PNP Transistor: 2N3906 or equivalent
1k ohm standard resistor
vibrating motor
battery case
then one  coin battery
Always try to use re-chargeable battery
because  infrared sensor has  largest current draw
and at continuous operation cause the battery down over a day or two depending on use.
Slide Switch to fit case
Slide Switch you can  switch on/off  your sensor
you can fit all the materials in one compact case
this is the  circuit,
from IR sensor's LED detect our hand movement
once IR LED detect  any  motions it will go to the Transistor
through 1K ohm resistor
which is connected to vibrating motor and  Transistor will activate
also connect coin battery  and slide switch
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