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Mattie Hogan

BSc [Hons] Creative Media Technologies

I am a graduated 4th year CMT student with a keen interest in Audio,Visual and Electronic applications. For my final year project I decided to build a tone controlled locking system. The thought process behind my project was to build something that incorporates as much as possible from what I've learned in CMT. Throughout my time in CMT I have been able to try my hand in an array of software practices such as coding with a variety of languages such as C++ and Python, along with getting myself familiar with the Adobe suite applications. I was also able to gain familiarity with practices such as Data Analytics, Sound Engineering, AV Production and Electrical Engineering.

This image shows the internal connections of the project which consists of the Arduino Uno, the 12V Solenoid, the Microphone, the Single Channel Relay Module and all the breadboard connections.

The prototype needed a variety of holes drilled in using a drill press. This image shows the back of the enclosure with the connections for the USB port and connections to the 12V power supply.

A small hole was drilled to the scale of the Mic for it to come through the structure and allow the Microphone to easily pick up the 555 tone generator.

This image shows the power supply that was used to power the solenoid, along with the 9V battery that powered the 555.

This device has a 555 Integrated Circuit device, connected to a combination of resistors, capacitors, loud speaker, on a stripboard. The structure was built using cardboard and the connection to the 9V battery was attached on the side of the enclosure.

This image shows how the whole circuit works. The user would put the ringing tone generator up to the mic on the side of the prototype and the tone would activate and open the locking system.

This is a basic flow chart of how the system works. The tone generated by the 555 based circuit would be picked up by the High Sensitivity Microphone connected to the Arduino, which would then be processed. Once the tone had met the parameters set in the code it would then trigger the relay to open the Solenoid Lock.

Tone-controlled Locking System

The tone-controlled locking system works by a microphone capturing the frequency from a tone generator and processing it through an Arduino to unlock the locking system. This is done by inputing an expected frequency and setting a threshold which will cause the lock to only open if the expected frequency is detected.

Tone-controlled Safe

My thesis is based on a tone-controlled safe that I built for my final year project. The prototype for this project was built using a combination of a 12V solenoid lock, single channel relay module, High Sensitivity Microphone Module, Arduino Uno and a 555 tone generator. The basic idea was to build a home made safe that would be controlled by a particular tone and would only open when the expected frequency was detected. The safe was built out of acrylic and was laser cut to the dimensions of 200mm x 100mm. My thesis shows a step by step run through of the process and how the prototype was built from the beginning of the year.

Creative Media Technologies

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