"SEXMACHNE" is a implementation of the Classic Arcade LightGun for playing games on a Raspberry PI connected to a legacy arcade monitor, using a modified Advance Mame Emulator and an ESP32.

The classic arcade lightgun is still being manufactured by SUZOHAPP.

You can find more information about it here.

You can see it in action here:

The Concept

The concept behind this setup is the same used on most of the LightGun arcade games, such as Operation Wolf, Lethal Enforcers, Area 15 and others:

• When the gun trigger is pressed, the game paints a whole white frame;
• The CRT monitor starts painting it from the top left of the corner, to right bottom corner;
• The game starts counting;
• Inside the LightGun there's a double convex lens converging the light focus to phototransistor; and
• When the light hits the phototransistor, the position is calculated according to the registered counter.

However for a wider compatibility SEXMACHINE's setup is slightly different:

• The Sexmachine's Advance Mame monitors the gun trigger via GPIO;
• When the trigger is pressed, the emulator waits for a VSync, paints a white frame, then wait for VSync again.
• The ESP32 have Interrupts attached to the VSync and HSync video pulses, along with the optical sensor from the gun; and
• The ESP32 monitors every scanline and, in case of a hit, notifies the emulator via serial communication for it to translate the right gun shot position to the game.

For detailed instructions and documentation, please visit the Projet's Github page:

https://github.com/ninomegadriver/lightgun/tree/main/sexmachine