Simple demo to detect knocking from a piezo sensor on the Raspberry Pi.

knock.py

#!/usr/bin/python

import time, signal, sys
from Adafruit_ADS1x15 import ADS1x15

def signal_handler(signal, frame):
        print 'You pressed Ctrl+C!'
        sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
#print 'Press Ctrl+C to exit'

ADS1015 = 0x00  # 12-bit ADC
ADS1115 = 0x01  # 16-bit ADC

# Initialise the ADC using the default mode (use default I2C address)
# Set this to ADS1015 or ADS1115 depending on the ADC you are using!
adc = ADS1x15(ic=ADS1015)


while 1:
  # Read channel 0 in single-ended mode, +/-4.096V, 250sps
  volts = adc.readADCSingleEnded(3, 1024, 860)

  # To read channel 3 in single-ended mode, +/- 1.024V, 860 sps use:
  # volts = adc.readADCSingleEnded(3, 1024, 860)

  if volts > 0.5:
    print "%.6f" % (volts)

  time.sleep(0.01)

Hi theapi,

I am having an issue with line 22:
Traceback (most recent call last):
File "vibe2.py", line 22, in
volts = adc.readADCSingleEnded(3, 1024, 860)
AttributeError: 'int' object has no attribute 'readADCSingleEnded'

I am using the ADS1015 and have changed line 17 to be: adc = ADS1015.

Would you help me understand what i am doing wrong? I am sorry but i am very new to coding and hardware so i would greatly appreciate your time and patience.