Experiment with Steve's circuite

The prototype was build according to Steve's circuit and the arduino code. Two electrode pads (ground/5v and sensor) were used to test the characteristics of the system. A bouch of experiments had been done including a time plot of the capacitance.

The result：

The system can differentiate touch with numbers of fingers, shown below. The time data step up with increasing of fingers. The data also respond to multiple people making contact in a chain. Only one person needs to make contact with the device (sensing lead), to make contact with either ground or 5v supply lead will increase the range of data. Either secondary leads can be affected via induction.

The plot shows when touch happened, the data increase.