Section 5: Control¶
In this section, we assemble the joystick and button controls, which allow the player to interact with the console.
The LameStation provides two different types of controls: joystick and buttons.
The LameStation incorporates an analog joystick that is configured to work like a D-pad, or directional pad, on a game controller. Instead of returning precise position values, it provides only directional values, making it much easier to use in an application.
To accomplish this, something called a window comparator circuit is used. By comparing the joystick voltages to reference voltages, clear on-off signals can be generated.
The buttons used are a very common type of button called a momentary pushbutton. That means that they close a switch when pressed and open it again when released.
There is also a reset button, but this one works a little differently. Instead of being connected to a regular pin, it controls a signal that causes the whole system to reset, including the Propeller and LCD.
- 1 x Joystick potentiometer
- 1 x LM339 quad comparator
- 1 x 14-pin DIP socket
- 6 x 3kΩ resistor
- 4 x 1kΩ resistor
- 1 x 0.1μF capacitor
- 2 x Pushbutton switch
- 2 x 10kΩ resistor
- 1 x Mini pushbutton switch