diff --git a/carom/cli.py b/carom/cli.py
index d892d30..60df687 100644
--- a/carom/cli.py
+++ b/carom/cli.py
@@ -15,6 +15,7 @@ click_log.basic_config(root_logger)
 def cli():
     pass
 
+
 @cli.command()
 def get_gpio():
     """
@@ -22,6 +23,7 @@ def get_gpio():
     """
     pass
 
+
 @cli.command()
 def get_uuid():
     """
@@ -29,6 +31,7 @@ def get_uuid():
     """
     click.echo(uuid.uuid5(uuid.NAMESPACE_DNS, str(uuid.getnode())))
 
+
 @cli.command()
 def run():
     """
@@ -36,6 +39,7 @@ def run():
     """
     pass
 
+
 @cli.command()
 def check_config():
     """
diff --git a/carom/config.py b/carom/config.py
index 6153e62..5caef44 100644
--- a/carom/config.py
+++ b/carom/config.py
@@ -19,7 +19,7 @@ _schema = Schema({
         'token': str,
     },
     'mapping': {
-        All(Coerce(int), Range(0, 28)): All(Coerce(int), Range(1, 8)),
+        All(Coerce(int), Range(1, 8)): All(Coerce(int), Range(0, 28)),
     },
     'logging': {
         'file': str