Capacitive Sensor driver wiring diagram?

Hi,

You use one pin connected directly to the sensor pad, this is the analog input to the ADC which measures the voltage. You also need a second pin connected to the sensor pad via a resistor. This is an output, used to charge the sensor pad.

Hi,

You use one pin connected directly to the sensor pad, this is the analog input to the ADC which measures the voltage. You also need a second pin connected to the sensor pad via a resistor. This is an output, used to charge the sensor pad.

Don't I need any capacitors? And what should my resistor value be?

No, you don't need capacitors. The capacitive sensor pad acts as the capacitor. We don't have any recommendation on the resistor value. You need to experiment and find a resistor value that works with your capacitive sensor (or calculate the RC time constant).

Note that the capacitive sensor driver is quite basic and you should expect to put in quite a bit of effort if you want to use it in an end product in the real world (where conditions like humidity etc vary a lot). So for instance the RC time constant would vary, as the capacitance of the sensor varies.