Earthtoken
Posts: 1
Joined: Thu Apr 15, 2021 3:00 pm

sensors for hard of hearing (spider sense)

Thu Apr 15, 2021 3:11 pm

Spider sense?

I am looking for a way to utilize my Raspberry Pi into a warning for me when someone is approaching from behind. I am hard of hearing and would love a sensor that lets me know when someone is approaching from behind. I teach school and constantly have students come up from behind. If I had something that could shake or vibrate more the closer they got would be good. Any suggestions?

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rpdom
Posts: 18525
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: sensors for hard of hearing (spider sense)

Fri Apr 16, 2021 5:40 am

Probably best to use a cheap ultrasonic distance detector.

It needs a trigger pulse, then a timer runs until it receives a response. From that you can work out the distance.

There are lots of examples of code using these.
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