1  # Simple test of the MPR121 capacitive touch sensor library.
 2  # Will print out a message when any of the 12 capacitive touch inputs of the
 3  # board are touched.  Open the serial REPL after running to see the output.
 4  # Author: Tony DiCola
 5  import time
 6  import board
 7  import busio
 8  
 9  # Import MPR121 module.
10  import adafruit_mpr121
11  
12  # Create I2C bus.
13  i2c = busio.I2C(board.SCL, board.SDA)
14  
15  # Create MPR121 object.
16  mpr121 = adafruit_mpr121.MPR121(i2c)
17  
18  # Note you can optionally change the address of the device:
19  # mpr121 = adafruit_mpr121.MPR121(i2c, address=0x91)
20  
21  # Loop forever testing each input and printing when they're touched.
22  while True:
23      # Loop through all 12 inputs (0-11).
24      for i in range(12):
25          # Call is_touched and pass it then number of the input.  If it's touched
26          # it will return True, otherwise it will return False.
27          if mpr121[i].value:
28              print("Input {} touched!".format(i))
29      time.sleep(0.25)  # Small delay to keep from spamming output messages.