python: ADC: add Navio+ support

Add Navio+ entry and add auto choice shield

Author: Igor Anokhin

Python/ADC.py

@@ -1,16 +1,29 @@
-import sys, time
+import sys, signal, time
+import navio.Common.util
 
-import navio.adc
-import navio.util
 
-navio.util.check_apm()
+if navio.Common.util.get_navio_version() == "NAVIO2":
+    import navio.Navio2.ADC as ADC
+else:
+    import navio.Navio.ADC as ADC
 
-adc = navio.adc.ADC()
+navio.Common.util.check_apm()
+
+
+def signal_handler(signal, frame):
+    print 'You pressed Ctrl+C!'
+    sys.exit(0)
+
+
+signal.signal(signal.SIGINT, signal_handler)
+# print 'Press Ctrl+C to exit'
+
+adc = ADC()
 results = [0] * adc.channel_count
 
 while (True):
     s = ''
-    for i in range (0, adc.channel_count):
+    for i in range(0, adc.channel_count):
         results[i] = adc.read(i)
         s += 'A{0}: {1:6.4f}V '.format(i, results[i] / 1000)
     print(s)