RETROLINK NES CONTROLLER CIRCUIT BOARD CODE

This is important because this is where the userвЂ™s input will first appear. If a button is pressed, the shift register will interpret a вЂњ0вЂќ. This means that when a button isnвЂ™t pressed, the shift register will interpret a logical вЂњ1вЂќ. A pull-up resistor is used to keep a defined state on the registerвЂ™s data inputs. The other end of each switch goes to a separate data input on the shift register. One side of each button is tied to ground. The 4021 is an 8-bit register, as you can see in the schematic, which is just enough to connect all eight of the NES controllerвЂ™s buttons to it. This is a schematic of the NES controllerвЂ™s insides. You can see how the 4021 is implemented below.

RETROLINK NES CONTROLLER CIRCUIT BOARD CODE

Although it isnвЂ™t necessary for understanding the Arduino code in this project, here is a datasheet of a typical version for curious readers.ДЄnd for readers who are even more curious, you can read about the theory and operation of shift registers here. The 4021 shift register is used inside these controllers. Specifically, it is a Parallel-In-Serial-Out, PISO for short. It consists of no more than a few pull-up resistors and a shift register. When I opened up an NES controller, I found it to have an elegant simplicity to it.

The NES controller can control a multitude of items from lights to robots and even a doomsday device if you really want вЂ“ the possibilities go as far as your imagination! To demonstrate how simple it really is to interface the controller to an Arduino, we will use no more than an Arduino UNO and an NES controller. But, if you like to tinker with electronics, the NES can become powerful in the DIY world with its easily hackable controller. The NES has become a dust collector for many of us who have moved on to modern systems.

These days, the NES is pretty antiquated and only the most nostalgic of gamers will fire one up. The Nintendo Entertainment System, AKA the NES, was once the pinnacle of video game systems.

Retrolink nes controller circuit board