98 lines
2.8 KiB
Arduino
98 lines
2.8 KiB
Arduino
|
/*
|
||
|
|
* A demo sketch that uses the AceButton Library
|
||
|
|
* (https://github.com/bxparks/AceButton) and the CapitiveSense Library
|
||
|
|
* (https://github.com/PaulStoffregen/CapacitiveSensor) to detect touches and
|
||
|
|
* clicks of a capacitive switch.
|
||
|
|
*
|
||
|
|
* Prompted by questions from Gaston Loos.
|
||
|
|
*
|
||
|
|
* Brian T. Park 2018
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if defined(ESP32) || defined(ESP8266)
|
||
|
|
#error ESP32 or ESP8266 not supported
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <CapacitiveSensor.h>
|
||
|
|
#include <AceButton.h>
|
||
|
|
using namespace ace_button;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A subclass of ButtonConfig that emulates a mechanical switch connected to a
|
||
|
|
* pull-up resistor on the input pin. A "touch" sends a LOW signal, just like a
|
||
|
|
* mechnical switch.
|
||
|
|
*/
|
||
|
|
class CapacitiveConfig: public ButtonConfig {
|
||
|
|
public:
|
||
|
|
CapacitiveConfig(CapacitiveSensor& sensor):
|
||
|
|
mSensor(sensor) {}
|
||
|
|
|
||
|
|
protected:
|
||
|
|
// Number of iterations to sample the capacitive switch. Higher number
|
||
|
|
// provides better smoothing but increases the time taken for a single read.
|
||
|
|
static const uint8_t kSamples = 30;
|
||
|
|
|
||
|
|
// The threshold value which is considered to be a "touch" on the switch.
|
||
|
|
static const long kTouchThreshold = 100;
|
||
|
|
|
||
|
|
int readButton(uint8_t /*pin*/) override {
|
||
|
|
long total = mSensor.capacitiveSensor(kSamples);
|
||
|
|
return (total > kTouchThreshold) ? LOW : HIGH;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
CapacitiveSensor& mSensor;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Timeout for a single read of the capacitive switch.
|
||
|
|
static const unsigned long TIMEOUT_MILLIS = 10;
|
||
|
|
|
||
|
|
// I used a 1M resistor between pins 4 (send) & metal plate, and a 1K resistor
|
||
|
|
// between the plate and pin 6 (receive). Try adjusting the
|
||
|
|
// CapacitiveConfig::kTouchThreshold value for other resistor values.
|
||
|
|
CapacitiveSensor capSensor(4, 6);
|
||
|
|
|
||
|
|
CapacitiveConfig buttonConfig(capSensor);
|
||
|
|
AceButton button(&buttonConfig);
|
||
|
|
|
||
|
|
void handleEvent(AceButton* /* button */, uint8_t eventType,
|
||
|
|
uint8_t /* buttonState */) {
|
||
|
|
switch (eventType) {
|
||
|
|
case AceButton::kEventPressed:
|
||
|
|
Serial.println(F("Pressed"));
|
||
|
|
break;
|
||
|
|
case AceButton::kEventClicked:
|
||
|
|
Serial.println(F("Clicked"));
|
||
|
|
break;
|
||
|
|
case AceButton::kEventDoubleClicked:
|
||
|
|
Serial.println(F("DoubleClicked"));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void setup() {
|
||
|
|
Serial.begin(115200);
|
||
|
|
while (!Serial); // Leonardo/Micro
|
||
|
|
|
||
|
|
// Set the timeout to 10 millisecond so that AceButton::check()
|
||
|
|
// can have about 4-5 iterations during the 50 millisecond debouncing time.
|
||
|
|
capSensor.set_CS_Timeout_Millis(TIMEOUT_MILLIS);
|
||
|
|
|
||
|
|
// Configure the button using CapacitiveConfig.
|
||
|
|
buttonConfig.setFeature(ButtonConfig::kFeatureClick);
|
||
|
|
buttonConfig.setFeature(ButtonConfig::kFeatureDoubleClick);
|
||
|
|
buttonConfig.setEventHandler(handleEvent);
|
||
|
|
}
|
||
|
|
|
||
|
|
void loop() {
|
||
|
|
unsigned long start = millis();
|
||
|
|
button.check();
|
||
|
|
|
||
|
|
// check on performance in milliseconds
|
||
|
|
unsigned long duration = millis() - start;
|
||
|
|
if (duration > TIMEOUT_MILLIS) {
|
||
|
|
Serial.print(F("duration: "));
|
||
|
|
Serial.println(duration);
|
||
|
|
}
|
||
|
|
}
|