diff --git a/db/migrate/20220514213623_deduplicate_arduinos.rb b/db/migrate/20220514213623_deduplicate_arduinos.rb
new file mode 100644
index 0000000..f10b8f7
--- /dev/null
+++ b/db/migrate/20220514213623_deduplicate_arduinos.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# Elimina arduinos multiplicados
+class DeduplicateArduinos < ActiveRecord::Migration[6.1]
+  def up
+    Raspberry.find_each do |raspberry|
+      unique_local_ids = raspberry.arduinos.distinct(:local_id).pluck(:local_id)
+
+      unique_local_ids.each do |unique_local_id|
+        arduinos = raspberry.arduinos.where(local_id: unique_local_id)
+        unique_arduino = arduinos.first
+        duplicated_arduinos = arduinos.where.not(id: unique_arduino.id)
+
+        result = Sensor.where(arduino_id: duplicated_arduinos.pluck(:id)).update_all(arduino_id: unique_arduino.id)
+        duplicated_arduinos.destroy_all if result
+      end
+    end
+  end
+
+  def down; end
+end