To demonstrate what they learned in the University of Maryland’s Electronics and Instrumentation II class, students had to design an electrical system that combined sensing and actuation. For my project I created what I called a digital safe. In my design, the user provided two types of inputs: numerical values selected by a rotary encoder and a left or right rotation as sensed by a Wii nunchuk.

I was able to program and LCD screen to display the current input and when the user was ready to select a value they would press a button. Once all values were collected, another button could be pressed to send the string of values to the computer to be analyzed. If the string did not match the correct key, the LCD screen would flash “Access Denied”. If the string was correct and matched the answer key, a Python program was executed which would display the contents of a .txt file.