Access control systems (ACS) are the ones, which people come across frequently while entering places, passing through somewhere or even logging into any online accounts. Public transportation, authorized building or room entrance, highway passing, PC accesses, signing on to online banking or social media accounts are some examples that can be experienced during everday life as the samples of accesses. In most cases, these actions are in under control the reason why personal security plays an important role. Therefore, there are plenty of approaches and electronic systems in the literature to provide control for such cases above. In this thesis, it is proposed an approach for low cost and easy to programme system, which is general purpose and multi-modal. General-purpose feature brings an innovation to these kind of systems to be more generic. The system can easily adapted to new applications, in other words, the system first can control door accesses, but on the other hand, it can also be used for some other applications like payment based paypass implementations. This diversity comes thanks to different input devices like smart card reader, fingerprint scanner, NFC/RFID reader, touchable screen for PIN entering & system response monitoring etc. Consequently, the system satisfies the multi-modal approach with these devices that make system more secure. In the following chapters, firstly the general details of the thesis are presented in the introduction part. There are introductory information about the system scheme and some analysis that are crucial to be held previously like requirement and feasibility. Also, it can be found the hypothesis which this thesis work stands for in terms academic approaches. There is also literature review for the previously handled works. Especially for the fingerprint sensor, there are some studies that use the same device which is controlled by microprocessor. Then, in the second chapter, the important background information for the phylosophy of this thesis is given. It contains about the preliminary explanations on behalf of biometry, cryptography, hash functions etc. Biometry is used in many different areas from security to forensic, even for diagnosis in the medicine. For authentication purposes, access systems can have sensors related to biometrics. This chapter helps the reader to understand the main frame of the study. In the third and the main chapter, all the design issues are presented. It has basically two sub-sections. Firstly, the hardware related knowledge is described. Sensors and controllers are given in here. In this study, the system engineering approaches are used together with embedded systems; therefore, different kind of sensors are to be work synchronously via controllers. The system basically consists of two nodes: Access Node-ACN and Admin Node-ADN. Each has a controller unit and some sensors. For the ACN, fingerprint sensor in the thesis takes the fingerprint image as 256x288 pixels in gray level. Then inside of the sensor, the whole image is transferred into characteristic file, and after into a template. There is no information related to algorithm neither in the datasheet nor in any of the source in the internet such as vendor. In our system, the data from the sensor is saved in the smart card securely and later newly captured data is to be compared with this smart card originated information. Extracted data from fingerprint must be stored securely in the smart card which does not have any extra protection mechanism. Therefore, biometric data hiding or encryption must be handled as the smart card can be on wrong hands. When access operation is needed, data in the card and the freshly read one from the user via sensor is to be compared, either does fingerprint sensor. Moreover, in the software structure part of this thesis in the second branch of Chapter three, hardware handling software details are given in the scope of software engineering. UML diagram contains the Role Based Access Control Pattern – RBACP to give different privileges to the different users. Thesis has general purpose approach by this way. Besides, in the admin part, the Windows operating system based GUI is designed thanks to C# programming language. This monitoring screen allows admin to control the system from far. Comnunication between access node and admin node is in wireless communication thanks to XBee sensors, so communication protocol that proposed by this thesis must be secure indeed, too. As the “access” needs to be secure, designed system must rely some scientifically secure algorithms that thesis mainly aims at. In 1976, public key cryptography released some opportinities to make system security by key exchange. Even when two wireless devices communicate with each other, man-in-the-middle attack can be less hazardous thanks to Diffie-Hellman key exchange algorithm. System Analysis is given in Chapter four. There are details about the system operation and some limitations related to some seperating devices that are occured during the design and the tests. All the overall system details are presented in this chapter. Any researcher who reads that thesis work can construct the system by using the hardware and software details inside. Thus, the researcher can have an ACS environment to work for security algorithms by implementation of cryptography or secure image-processing issues for future work together ciphering with fingerprint issues. In the last chapter, last results of the project are presented. In this conclusion part, the future considerations related to thesis are introduced, too. Smart cards and NFC/RFID technology are in use for loads of applications. If the biometric information is intended to be embedded into these technologies, then some scientific questions arise related to security. Moreover, if wireless technology is in use as a hardware module, then another security circumstance emerges to be academically handled as this thesis does via design of communication protocol in the scope of Petri nets. Modelling the own protocol together with data packages, instruction codes etc. makes the thesis more academic and the system more secure. To conclude, the system was successfully designed and all academic approaches were explained in this thesis report.