Raspberry Pi で ADコンバータを使う

#! /usr/bin/python3
#  -*- coding: utf-8 -*-
#
#   mcp3208_read.py
#
#                   Jan/26/2018
#
# --------------------------------------------------------------------
import sys
from gpiozero import MCP3208
from time import sleep
# --------------------------------------------------------------------
sys.stderr.write("*** 開始 ***\n")
ports = []
for it in range(8):
    ports.append(MCP3208 (channel=it))
#
imax = 4096
try:
    while True:
        for it in range(8):
            iv = int(imax * ports[it].value)
            print (it,iv)
#
        print()
        sleep(3)
#
except KeyboardInterrupt:
    print('interrupted!')
    for it in range(8):
        ports[it].close()
    sys.exit
#
sys.stderr.write("*** 終了 ***\n")
# --------------------------------------------------------------------