diff --git a/spaceapi/sensors.py b/spaceapi/sensors.py
--- a/spaceapi/sensors.py
+++ b/spaceapi/sensors.py
@@ -3,7 +3,7 @@ import json
 from pkg_resources import resource_filename
 
 import jsonschema
-from flask import Blueprint, jsonify
+from flask import Blueprint, jsonify, request, abort, current_app
 
 from .auth import httpauth
 from .active import active_json, save_last_state
@@ -22,55 +22,54 @@ IDENTIFICATION_KEYS = ('name', 'location
 
 
 def get_identification_key(data):
-	return first(data, IDENTIFICATION_KEYS)
+    return first(data, IDENTIFICATION_KEYS)
 
 
 def set_value(data, key):
 
-	try:
-		subkey = get_identification_key(data)
-	except ValueError:
-		return 400
+    try:
+        subkey = get_identification_key(data)
+    except ValueError:
+        return abort(400)
 
-	try:
-		index = fuzzy_list_find(active_json['sensors'][key],
-								key, data[subkey])
-		active_json['sensors'][key][index].update(data)
-	except ValueError:
-		active_json['sensors'][key].append(data)
+    try:
+        index = fuzzy_list_find(active_json['sensors'][key],
+                                subkey, data[subkey])
+        active_json['sensors'][key][index].update(data)
+    except ValueError:
+        active_json['sensors'][key].append(data)
 
-	save_last_state()
-	return jsonify(active_json)
+    save_last_state()
+    return jsonify(active_json)
 
 
 def set_radiation_value(data):
 
-	radiation_keys = [k for k in RADIATON_SUBKEYS if k in data]
+    radiation_keys = [k for k in RADIATON_SUBKEYS if k in data]
 
-	if not radiation_keys:
-		return 400
+    if not radiation_keys:
+        return abort(400)
 
-	for first_subkey in radiation_keys:
+    for first_subkey in radiation_keys:
 
-		try:
-			second_subkey = get_identification_key(data[first_subkey])
-		except ValueError:
-			return 400
+        try:
+            second_subkey = get_identification_key(data[first_subkey])
+        except ValueError:
+            return abort(400)
 
-		try:
-			index = fuzzy_list_find(
-				active_json['sensors']['radiation'][first_subkey],
-				second_subkey,
-				data[first_subkey][second_subkey])
-			active_json['sensors'][
-				'radiation'
-			][first_subkey][index].update(data)
-		except ValueError:
-			active_json['sensors']['radiaton'][first_subkey].append(data)
+        try:
+            index = fuzzy_list_find(
+                active_json['sensors']['radiation'][first_subkey],
+                second_subkey,
+                data[first_subkey][second_subkey])
+            active_json['sensors']['radiation'][first_subkey][index].update(
+                data)
+        except ValueError:
+            active_json['sensors']['radiaton'][first_subkey].append(data)
 
+    save_last_state()
+    return jsonify(active_json)
 
-	save_last_state()
-	return jsonify(active_json)
 
 @sensors_views.route('/set/<key>', methods=['POST'])
 @httpauth.login_required
@@ -79,18 +78,20 @@ def set_sensors(key):
     if key in ALLOWED_SENSORS_KEYS and key in active_json['sensors']:
         data = request.data
         try:
-            data = json.loads(data)
+            data = json.loads(data.decode('utf-8'))
 
             try:
                 jsonschema.validate(data, ALLOWED_SENSORS_KEYS[key])
             except jsonschema.ValidationError:
-                return 400
+                current_app.logger.info('Validation Error')
+                return abort(400)
 
             if key != 'radiation':
                 return set_value(data, key)
             else:
                 return set_radiation_value(data)
+
         except ValueError:
-            return 400
+            return abort(400)
     else:
-        return 400
+        return abort(400)