Arduino Capacitive Touch

Capacitive touch capability is in two places:

 

On the four alligator clip friendly pads on the Capacitive Touch area on Crickit.

Capacitive touch is very useful for activating things in your projects.

The following code demonstrates the features of the Crickit cap touch pads.

// Adafruit Crickit Capacitive Touch Demo for Arduino
//
// Displays the value of Adafruit Crickit touchpad values when touched
//
// Tested with the Crickit + micro:bit, all good

#include "Adafruit_Crickit.h"

Adafruit_Crickit crickit;

#define CRICKIT_NUM_TOUCH   4
#define CAPTOUCH_THRESH   500

void setup() {
  Serial.begin(9600);  // Set up serial monitor - be sure it is set to 9600 
  Serial.println("Cap Touch Demo");
  if(!crickit.begin()) {                         // Check if Crickit is attached
     Serial.println("ERROR Starting crickit");   // If an error, print and
     while(1) ;                                  //   go to a infinite loop to stop                       
  }
  else Serial.println("seesaw started");         // success, we have a Crickit
}

void loop() {

  for(int i=0; i<CRICKIT_NUM_TOUCH; i++){  // check each touch input
    uint16_t val = crickit.touchRead(i);   // read the touch input

    if(val > CAPTOUCH_THRESH){             // if the value read is > the threshold
      Serial.print("CT");                  //  print info to serial monitor
      Serial.print(i + 1);
      Serial.print(" touched! value: ");
      Serial.println(val);
    }
  }
  delay(100);  // wait tiny bit between checks
}
This guide was first published on May 16, 2018. It was last updated on May 16, 2018.
This page (Arduino Capacitive Touch) was last updated on Jun 01, 2020.