Stanislav Ponomarev has been working hard with his NerdKit Microcontroller. He developed an impressive RGB LED Tetris Game. I think this version is probably more fun than the original version. I could just imagine scaling this up and playing it on the side of an apartment building with each window acting as a pixel of the game. Stanislav will send in the code and schematics as soon as they are complete.
UPDATE: The code is now available here.
“In image file MainBoard.jpg in top there are ICs from left to right respectively:
Principle of operation is quite simple. Up-counter is responsible for keeping track of which row is currently being shown, 4-to-16 decoder converts 4-bit binary number from up-counter into 16 different lines. The decoder I have outputs LOW for the current input value, so I had to pass all 16 lines from decoder through the inverters to
The shift registers are used to sink the current from LEDs, so I need a logical 0 to turn LED on, or 1 to turn it off. To eliminate the need of remembering 0 is on, 1 is off, I simply pass the SPI output from microcontroller through the inverter to the shift register. That solves the problem well and in my code, 1 becomes on, and 0 – off.
The rest is up to the code that I will post in a few days. In it I have a timer that updates the whole image 60 times a second, a double-buffered output with a vertical sync function, and I use temperature sensor reading, and a circuit noise to generate the seed for pseudo-random number generator, which is a must for most games.
I had the screen done a while before I decided to write tetris for it. The hardware + basic code for image output proved to be very useful. I was able to output current temperature reading, Images downloaded through the UART from the computer, and a output of a current time in analog format.”
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