Real Time Data Acquisition and Encrypted Data Transmission using Microcontroller

摘要

Real time data acquisition and encrypted data transmission using low-cost Microcontroller Devices like Arduino UNO has become very popular and effective in recent past. The real time data does gather may be readily processed using low cost handheld devices to arrive at important decisions in various fields e.g. Telemedicine, Industrial Process Control , Environmental Studies to name a few. Whereas such low cost solution may be effectively put to use in many important areas as noted above, the issue of data security during transmission is of paramount importance. If such sensitive data is intercepted and modified during transmission the result may be catastrophic. Any monitoring system is an automated system, designed to monitor different environmental parameters i.e. temperature, humidity, intensity of light, intensity of carcinogenic particles in air etc. in different locations at different point of time and continuously record them properly for future analysis. Monitoring temperature and humidity is gaining importance in different quality applications. Any deterioration will create hazard and will give an early warning in ensuing problems applications. The present paper aims at integration of a suitable 256 bits Rijndael data encryption algorithm at the microcontroller level with a suitable decryption algorithm to be made available at receiver's end. The system will monitor temperature and humidity at any time. It requires a digital composite sensor for measuring temperature and relative humidity. Also Arduino Microcontroller is used for performing necessary computations and recording temperature and humidity from the sensor and record inside relational database system in encrypted fashion. This real data can be viewed through web as well as graphically using MATLAB for better monitoring.