# Author: Mihai Tudor Panu # Copyright (c) 2016 Intel Corporation. # # 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 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION # This example demonstrates how to use one of the ADS1115 ADCs on the # DFRobot Joule Shield with devices that output a small differential # voltage (e.g. geophones, piezoelectric bands or pads, thermocouples). from __future__ import print_function from threading import Timer from time import sleep from upm import pyupm_ads1x15 as upm def stop(): global running running = False def main(): global running running = True fileName = './ads1115.data' # Output filename id = 0 # Sample number # Initialize and configure the ADS1115 for the SM-24 Geophone # There are two ADS1115 chips on the DFRobot Joule Shield on the same I2C bus # - 0x48 gives access to pins A0 - A3 # - 0x49 gives access to pins A4 - A7 ads1115 = upm.ADS1115(0, 0x48) # Put the ADC into differential mode for pins A0 and A1, # the SM-24 Geophone is connected to these pins ads1115.getSample(upm.ADS1X15.DIFF_0_1) # Set the gain based on expected VIN range to -/+ 2.048 V # Can be adjusted based on application to as low as -/+ 0.256 V, see API # documentation for details ads1115.setGain(upm.ADS1X15.GAIN_TWO) # Set the sample rate to 860 samples per second (max) and turn on continuous # sampling ads1115.setSPS(upm.ADS1115.SPS_860) ads1115.setContinuous(True) # Open the output file try: f = open(fileName, 'w') except OSError as e: print('Cannot open output file:', e) return # Setup a timer to stop logging after 10 seconds t = Timer(10, stop) t.start() # Read sensor and write to file every 1 ms while running: f.write(str(id) + ' %.7f' % ads1115.getLastSample() + '\n') id += 1 sleep(0.001) # Close and exit f.close() print('Wrote', id, 'samples to file:', fileName) return if __name__ == '__main__': main()