Disable motor relays when there's a problem

relays.py

@@ -0,0 +1,28 @@
+import time
+import smbus
+import sys
+
+DEVICE_BUS = 1
+DEVICE_ADDR = 0x10
+bus = smbus.SMBus(DEVICE_BUS)
+
+def relay_on(num):
+    bus.write_byte_data(DEVICE_ADDR, num, 0x00)
+
+def relay_off(num):
+    bus.write_byte_data(DEVICE_ADDR, num, 0xFF)
+
+def test():
+    while True:
+        try:
+            for i in range(1,5):
+                relay_on(i)
+                time.sleep(1)
+                relay_off(i)
+                time.sleep(1) 
+        except KeyboardInterrupt as e:
+            sys.exit()
+
+
+if __name__ == '__main__':
+    test()