Capacitive touch sensors appears in different forms. Many popular forms include screens on smartphones, tablets and switches. In order to activate these screens or switches, a conductive material need to come into close proximity. Many use their fingers for this purpose.
However, using a stylus instead of a finger with capacitive touch sensors is often preferred by people who may have BIG fingers or other physical limitations. Here, we share an easy and expensive way to make a stylus that may be used by people of different sizes and abilities.
To start, we need three materials:
1) 1 1/2" x 1 1/2" square piece of low-density, 1/4" thick conductive foam;
2) 2" piece of rubber of silicone self-adhesive tape (regular electrical tape will work, also);
3) 1 metal chopstick (many Asian grocery stores sell these and are sometimes known as Korean chopsticks).
Notice the ends of the chopstick are of slightly different sizes. It doesn't matter which end is used for this step. HOWEVER, if you want to use Option 3) below (mouthstick stylus), use the thicker end in this step -- wrap the conductive foam around the thicker end! Otherwise, wrap the conductive foam around either end of the chopstick.