Homemade color sudoku game software#
Homemade color sudoku game code#

After that it’s just a matter of scanning the keyboard matrix and converting the key presses to numbers. The last line is manually filled because there will only be one possible pattern at that point. The first three lines are randomly selected from the table, with checks to make sure that a selected line doesn’t conflict with a previous line. The lines for the puzzle are derived from a 24-element lookup array. I added a save to EEPROM of the “seed” to ensure that a different sequence is generated at each powerup. The commands “random” and “randomSeed” are used to help create the game. These are separate “include” files for the project.

Homemade color sudoku game software#

I use my own barebones version of LCD software and keyboard matrix decode software. The only difference is in the programming method. The software is the same for both the Nano and the ATMega328 chip. The pictures show the modules I used but there are also all-in-one modules that do both functions. That required that I add a small board to allow for USB recharging and another small board to boost the battery voltage to 5 volts for the LCD and the ATMega chip. I decided to make my version battery powered so I used a common 18650 Li-ion, 3.6-volt battery. The reset switch clears the old game and generates a new game.

There is also a power switch and a reset switch. Each switch corresponds directly to the equivalent location on the display. The input for the game is a homemade 4x4 switch matrix. The software handles that difference with an LCD address lookup table. In other words, if you had a test program that just sent out a string of characters to the LCD, the 21st character would show up at the start of the third line and the 41st character wraps back around to the start of the first line. Obviously there is a difference because there are four lines instead of two but, in the 2004, the third line is an extension of the first line and the fourth line is an extension of the second line. An interesting difference is in the addressing of the display locations. The 2004 LCD interfaces to the Arduino the same way as a 1602 LCD. The other aspect that is different is that the Nano runs at 16-MHz using an external crystal but I chose to use the built-in 8-MHz oscillator for the ATMega328 chip. As you can see, I built the circuit on a small breadboard that piggybacks on the LCD module. That is the same chip used in the Nano but using it by itself allows for a more compact build and less power consumption.

Homemade color sudoku game code#

I did the prototyping using a Nano and then burned the code into an ATMega328 chip. The hardware can be based on pretty much any Arduino version.