upm/examples/python/ads1015.py

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# Author: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
# 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 the ADS1015 ADC on the Grove Joule
# Shield or the Sparkfun ADC Block for Edison 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 = './ads1015.data' # Output filename
id = 0 # Sample number
# Initialize and configure the ADS1015
ads1015 = upm.ADS1015(0, 0x48)
# Put the ADC into differential mode for pins A0 and A1
ads1015.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
ads1015.setGain(upm.ADS1X15.GAIN_TWO)
# Set the sample rate to 3300 samples per second (max) and turn on continuous
# sampling
ads1015.setSPS(upm.ADS1015.SPS_3300)
ads1015.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' % ads1015.getLastSample() + '\n')
id += 1
sleep(0.001)
# Close and exit
f.close()
print('Wrote', id, 'samples to file:', fileName)
return
if __name__ == '__main__':
main()