77 lines
3.3 KiB
Python
77 lines
3.3 KiB
Python
# Copyright (c) 2014 Adafruit Industries
|
|
# Author: Tony DiCola
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in
|
|
# all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
# THE SOFTWARE.
|
|
import sys
|
|
import time
|
|
|
|
import MPR121
|
|
|
|
|
|
print('MPR121 Capacitive Touch Sensor Test')
|
|
|
|
# Create MPR121 instance.
|
|
cap = MPR121.MPR121()
|
|
|
|
# Initialize communication with MPR121 using default I2C bus of device, and
|
|
# default I2C address (0x5A). On BeagleBone Black will default to I2C bus 0.
|
|
if not cap.begin():
|
|
print('Error initializing MPR121. Check your wiring!')
|
|
sys.exit(1)
|
|
|
|
# Alternatively, specify a custom I2C address such as 0x5B (ADDR tied to 3.3V),
|
|
# 0x5C (ADDR tied to SDA), or 0x5D (ADDR tied to SCL).
|
|
#cap.begin(address=0x5B)
|
|
|
|
# Also you can specify an optional I2C bus with the bus keyword parameter.
|
|
#cap.begin(bus=1)
|
|
|
|
# Main loop to print a message every time a pin is touched.
|
|
print('Press Ctrl-C to quit.')
|
|
last_touched = cap.touched()
|
|
while True:
|
|
current_touched = cap.touched()
|
|
# Check each pin's last and current state to see if it was pressed or released.
|
|
for i in range(12):
|
|
# Each pin is represented by a bit in the touched value. A value of 1
|
|
# means the pin is being touched, and 0 means it is not being touched.
|
|
pin_bit = 1 << i
|
|
# First check if transitioned from not touched to touched.
|
|
if current_touched & pin_bit and not last_touched & pin_bit:
|
|
print('{0} touched!'.format(i))
|
|
# Next check if transitioned from touched to not touched.
|
|
if not current_touched & pin_bit and last_touched & pin_bit:
|
|
print('{0} released!'.format(i))
|
|
# Update last state and wait a short period before repeating.
|
|
last_touched = current_touched
|
|
time.sleep(0.1)
|
|
|
|
# Alternatively, if you only care about checking one or a few pins you can
|
|
# call the is_touched method with a pin number to directly check that pin.
|
|
# This will be a little slower than the above code for checking a lot of pins.
|
|
#if cap.is_touched(0):
|
|
# print 'Pin 0 is being touched!'
|
|
|
|
# If you're curious or want to see debug info for each pin, uncomment the
|
|
# following lines:
|
|
#print '\t\t\t\t\t\t\t\t\t\t\t\t\t 0x{0:0X}'.format(cap.touched())
|
|
#filtered = [cap.filtered_data(i) for i in range(12)]
|
|
#print 'Filt:', '\t'.join(map(str, filtered))
|
|
#base = [cap.baseline_data(i) for i in range(12)]
|
|
#print 'Base:', '\t'.join(map(str, base))
|