The goal with this degree project has been to design a circuit board for an existing bicycle lock that will be able to prevent bicycle theft by sending an alarm. The bicycle lock will be communicating with the radio protocol LoRa and send an alarm with the position to the user. An alarm is detected using an accelerometer which detects changes in movement and the position is obtained with the help of a GPS receiver. The method for the project has been divided into four parts which is the following: component selection, component verification, programming of development card and finally design of circuit board. The components of the system have been tested using Arduino and breadboard to verify that the concept works. After that, a circuit board has been designed that can meet the defined requirements for this work.