09.06.2015 Optical does not work

A project log for Sit.Up

Sitting for long periods has become more common in today’s life causing serious health issues. Sit.Up!

electrobobelectrobob 06/08/2015 at 22:390 Comments

Today I was checking the proximity sensors based on optical reflection, specially the VCNL4020 which can do 20cm and which I have in my parts box. Or the SI1146. It turns out that even though these would allow for a smaller sensor, they have more limited range than the ultrasonic distance sensor. Then, it hit me: capacitive! A simple wire placed under the chair can measure capacitance which should change depending on whether somebody is sitting or not.

Note: i am not looking at making a chair with built in sensor, rather a sensor as a simple to use add-on.