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130 | #!/usr/bin/env python
#-----------------------------------------------------------------------------
# ex2_Presence_Sensing.py
#
# Simple example for the qwiic MAX3010x device
# This takes an average reading at power up and if the reading changes more than 100,
# then print 'Something is there!'.
#
#------------------------------------------------------------------------
#
# Written by Pete Lewis
# SparkFun Electronics, May 2020
#
# Based on code from the SparkFun MAX3010x Sensor Arduino Library
# https://github.com/sparkfun/SparkFun_MAX3010x_Sensor_Library
# By: Nathan Seidle @ SparkFun Electronics, October 2nd, 2016
#
# This python library supports the SparkFun Electroncis qwiic
# qwiic sensor/board ecosystem on a Raspberry Pi (and compatable) single
# board computers.
#
# More information on qwiic is at https://www.sparkfun.com/qwiic
#
# Do you like this library? Help support SparkFun. Buy a board!
#
#==================================================================================
# Copyright (c) 2019 SparkFun Electronics
#
# 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.
#==================================================================================
# Example 2
#
from __future__ import print_function
import qwiic_max3010x
import time
import sys
def millis():
return int(round(time.time() * 1000))
def runExample():
print("\nSparkFun MAX3010x Photodetector - Example 1\n")
sensor = qwiic_max3010x.QwiicMax3010x()
if sensor.begin() == False:
print("The Qwiic MAX3010x device isn't connected to the system. Please check your connection", \
file=sys.stderr)
return
else:
print("The Qwiic MAX3010x is connected.")
# Setup to sense up to 18 inches, max LED brightness
ledBrightness = 0xFF # Options: 0=Off to 255=50mA
sampleAverage = 4 # Options: 1, 2, 4, 8, 16, 32
ledMode = 2 # Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green
sampleRate = 400 # Options: 50, 100, 200, 400, 800, 1000, 1600, 3200
pulseWidth = 411 # Options: 69, 118, 215, 411
adcRange = 2048 # Options: 2048, 4096, 8192, 16384
if sensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange) == False:
print("Device setup failure. Please check your connection", \
file=sys.stderr)
return
else:
print("Setup complete.")
sensor.setPulseAmplitudeRed(0) # Turn off Red LED
sensor.setPulseAmplitudeGreen(0) # Turn off Green LED
samplesTaken = 0 # Counter for calculating the Hz or read rate
unblockedValue = 0 # Average IR at power up
startTime = 0 # Used to calculate measurement rate
# Take an average of IR readings at power up
unblockedValue = 0
for i in range(0,32):
unblockedValue += sensor.getIR() # Read the IR value
unblockedValue /= 32
startTime = millis()
while True:
samplesTaken += 1
IRSample = sensor.getIR()
hertz = samplesTaken / ((millis() - startTime) / 1000)
currentDelta = (IRSample - unblockedValue)
hertz = round(hertz, 2)
currentDelta = round(currentDelta, 2)
message = ' ' # blank message
if currentDelta > 100:
message = 'Something is there!'
print(\
'IR[', IRSample , '] \t',\
'Hz[', hertz , '] \t',\
'delta[', currentDelta, ']',\
message
)
if __name__ == '__main__':
try:
runExample()
except (KeyboardInterrupt, SystemExit) as exErr:
print("\nEnding Example 2")
sys.exit(0)
|