diff --git a/app/models/arduino.rb b/app/models/arduino.rb
index e87229e..29046d3 100644
--- a/app/models/arduino.rb
+++ b/app/models/arduino.rb
@@ -4,4 +4,6 @@ class Arduino < ApplicationRecord
   belongs_to :raspberry
   belongs_to :reading
   has_many :sensors
+
+  validates_presence_of :local_id
 end
diff --git a/app/models/raspberry.rb b/app/models/raspberry.rb
index 56af231..70b3f58 100644
--- a/app/models/raspberry.rb
+++ b/app/models/raspberry.rb
@@ -3,4 +3,7 @@
 class Raspberry < ApplicationRecord
   has_many :readings
   has_many :arduinos
+
+  validates_presence_of :name
+  validates_uniqueness_of :name
 end
diff --git a/app/models/sensor.rb b/app/models/sensor.rb
index bc40192..69b2bf8 100644
--- a/app/models/sensor.rb
+++ b/app/models/sensor.rb
@@ -2,4 +2,6 @@
 
 class Sensor < ApplicationRecord
   belongs_to :arduino
+
+  validates_presence_of :timestamp, :local_type, :value, :unit
 end