diff --git a/app/controllers/readings_controller.rb b/app/controllers/readings_controller.rb
index 854af12..0f532ed 100644
--- a/app/controllers/readings_controller.rb
+++ b/app/controllers/readings_controller.rb
@@ -49,8 +49,8 @@ class ReadingsController < ActionController::API
   # número de serie apenas empiecen a actualizarse los nodemecu.
   def raspberry
     @raspberry ||= begin
-                     r   = Raspberry.find_by(serial_number: params[:serial_number])
-                     r ||= Raspberry.find_by(name: params[:controller_id])
+                     r   = Raspberry.find_or_create_by(serial_number: params[:serial_number])
+                     r ||= Raspberry.find_or_create_by(name: params[:controller_id])
                      r.tap do |r|
                        r.name = params[:controller_id]
                        r.serial_number = params[:serial_number]