i decided to add two sensor pillows rather than to put some sensors directly onto the chair.
First pillow provides to stand up the user every hour to activate the constant body circulation. Each hour, pillow is gonna heat up, so users need to stand up and walk around until it cools down
Second pillow is gonna measure the distance between user and the chair. If the distance between user is gonna rise, LED will be activated to warn user that they sit in a wrong way. If the distance is normal, LED is gonna have a constant color.