1  # SPDX-FileCopyrightText: Copyright (c) 2020 Bryan Siepert for Adafruit Industries
 2  # SPDX-License-Identifier: MIT
 3  import time
 4  import board
 5  
 6  import adafruit_pcf8591.pcf8591 as PCF
 7  from adafruit_pcf8591.analog_in import AnalogIn
 8  
 9  ################ AnalogIn Example #####################
10  #
11  # This example shows how to use the AnalogIn class provided
12  # by the library by creating an AnalogIn instance and using
13  # it to measure the voltage at the first ADC channel input
14  #
15  # Wiring:
16  # Connect a voltage source to the first ADC channel, in addition to the
17  # normal power and I2C connections. The voltage level should be between 0V/GND and VCC
18  #
19  ########################################
20  
21  i2c = board.I2C()
22  pcf = PCF.PCF8591(i2c)
23  
24  pcf_in_0 = AnalogIn(pcf, PCF.A0)
25  while True:
26      raw_value = pcf_in_0.value
27      scaled_value = (raw_value / 65535) * pcf_in_0.reference_voltage
28  
29      print("Pin 0: %0.2fV" % (scaled_value))
30      print("")
31      time.sleep(1)