2/3 - 2/7

This week I got some more work done on my lock-box/safe project. Firstly, I finished doing the code for it. Seen below is some of this code. To start off, the code was particularly challenging, since this week, I decided to switch from a 4x4 button keypad matrix to a 3x4 button keypad matrix. Subsequently, there was a bunch of code that I had to modify in order to change it from 4x4 to 3x4. However, this proved to be more challenging than I originally anticipated. The pinout for the 4x4 makes perfect sense, with the first 4 pins correlating to the first 4 columns, and the last 4 pins correlating to the last 4 rows. However, the pinout for the 3x4 is completely random, with no clear pattern to the pinout at all. Subsequently, I had to modify the code quite a bit to account for this sudden change in values, and through trial and error, I was able to finish the code part of the circuit.

Next, I had to work out how I could use transistors to make the solenoid work properly. With the help of Mr. Christy, one of my shop teachers, I was able to successfully implement a transistor into my design, and now when someone inputs the correct combination, it powers a 5v solenoid lock, and turns it on, which is something that I can use for unlocking the door to the safe.

Then I began to design the safe in Fusion 360. I began designing on Tuesday, but my week was cut short since Wednesday was a half-day and we had gym, so I was only in shop for one period. Also, Thursday was a snow day, so we didn't have school. I am nearing the end of the CAD process, and I will soon begin designing and making the PCB for the circuit and lock.

First half of code

Second half of code

Button Matrix Diagram

4x4 Button Matrix Pinout

3x4 Button Matrix Pinout