Method capacitiveSensor

CapacitiveSensor.cpp:63–106

// Functions available in Wiring sketches, this library, and other libraries

long CapacitiveSensor::capacitiveSensor(uint8_t samples)
{
	total = 0;
	if (samples == 0) return 0;
	if (error < 0) return -1;            // bad pin


	for (uint8_t i = 0; i < samples; i++) {    // loop for samples parameter - simple lowpass filter
		if (SenseOneCycle() < 0)  return -2;   // variable over timeout
}

		// only calibrate if time is greater than CS_AutocaL_Millis and total is less than 10% of baseline
		// this is an attempt to keep from calibrating when the sensor is seeing a "touched" signal

		if ( (millis() - lastCal > CS_AutocaL_Millis) && abs(total  - leastTotal) < (int)(.10 * (float)leastTotal) ) {

			// Serial.println();               // debugging
			// Serial.println("auto-calibrate");
			// Serial.println();
			// delay(2000); */

			leastTotal = 0x0FFFFFFFL;          // reset for "autocalibrate"
			lastCal = millis();
		}
		/*else{                                // debugging
			Serial.print("  total =  ");
			Serial.print(total);

			Serial.print("   leastTotal  =  ");
			Serial.println(leastTotal);

			Serial.print("total - leastTotal =  ");
			x = total - leastTotal ;
			Serial.print(x);
			Serial.print("     .1 * leastTotal = ");
			x = (int)(.1 * (float)leastTotal);
			Serial.println(x);
		} */

	// routine to subtract baseline (non-sensed capacitance) from sensor return
	if (total < leastTotal) leastTotal = total;                 // set floor value to subtract from sensed value
	return(total - leastTotal);

}

long CapacitiveSensor::capacitiveSensorRaw(uint8_t samples)
{