i’m a scholar of mechanical engineering and have some information about electronics.
I’ve seen a digital stylus which works with capacitive show. A few of this stylus are wacom bamboo, stilo a2, apex, and so forth.
This stylus have some circuit which replicates human fingur capacitance over a bigger scale.
There’s some change in capacitance of the touchscreen sensor when a fingur is close to to the display. This alteration of capacitance causes change in voltage a that time on touchscreen.
I’ve learn that human physique can work like a floor for this display. The two plates of capacitor are fashioned by the touchscreen sensor and fingur the place sensor is related to some voltage and fingur as floor.
So as a substitute of fingure as floor, i used telephones floor. I minimize off a outdated earphone and use ut as a floor. I attempted to the touch the display with that floor wire, but it surely did not work.
I positioned a coin on the display and related the wire to the coin.
Doing this really labored!
From this i concluded that the world of wire was not sufficient to make adjustments to the capacitance of the display. The minimal diameter ought to me about 4mm for the display to work.
I need to scale back the diameter to about 1mm.
So what sort of circuit can i exploit to make adjustments within the display capacitance with such a small space?