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 many others.
This stylus have some circuit which replicates human fingur capacitance over a bigger scale.
There may be some change in capacitance of the touchscreen sensor when a fingur is close to to the display. This variation 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 shaped by the touchscreen sensor and fingur the place sensor is related to some voltage and fingur as floor.
So as an alternative of fingure as floor, i used telephones floor. I reduce off a previous earphone and use ut as a floor. I attempted to the touch the display with that floor wire, nevertheless it did not work.
I positioned a coin on the display and related the wire to the coin.
Doing this truly 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 wish to cut 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?