#Fingerprint lock box free

) You can also add an alarm associated with this relay, if you have a smoke detector that is dedicated to the trash, you can undoubtedly recover the piezo inside (be careful! The circuit that I will propose to you later for Piloting the piezo has only been tested for a 3-wire piezo! (See photos))Īs you can imagine, the Arduino is the brain of this lock system. Note that it is possible to add a piezo sensor on the door to trigger this relay in case the door undergoes vibrations (this sensor could be triggered if we tried to cut the door or something like that. If the current is turned off, then nothing works, but if the current returns, then the Arduino 'Reset' and if there was not a bistable relay then the communication between the sensor and the Arduino would be restored, and there, the Nasty thieves can go home if they reprogrammed the sensor and closed the box! A bistable relay, unlike a conventional relay, retains that switching position even if it is no longer powered. This is where the interest of using a bistable relay comes into play. (Well yes, if the evil thieves open the sensor box and reprogram to accept their fingerprints, it's not very secure!) The bistable relay serves to disable the communication between the sensor and the Arduino in case there are more than 3 false scanner fingerprints, or if the box containing the sensor Box that contains the electronic system) had to be opened or turn off. This system was designed for a garage door. I will detail the electronic part of the system and explain briefly the reasoning I had to create the circuit. So I imagined an electrically controllable system, with stepper motors, that can take in or out steel stem in soil. In the basic system, there are two axes hanging on the door that slide behind the door frame, left and right to prevent it from tipping. So I was inspired by the existing locking system that I decided to 'modify'. I have a swinging garage door like this one. The second part of the system is exclusively mechanical.

If you want details on how the system works, you will find them in the program comments.

#Fingerprint lock box free

The program is not necessarily the most optimized (I'm learning programming with this project), free to modify it. An electronic part that is composed of power electronics, control electronics and programmable electronics: an Arduino