(a revolutionary input device that's only 30 years too late)
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To prevent confusion, a lighthammer is just like the lightpen and lightgun a CRT based input device for your computer... well retro computer that is. Because nowadays in the age of touchscreens, who needs a lightpen. And in the age of LCD's well not many people own a CRT anymore. Therefore lightguns aren't what they used to be. The good old lightgun is just a lightpen with a trigger and an extra lense. And in order for the lightpen/gun to operate you'll need a CRT monitor. If you have such a monitor and a retrocomputer like the C64, then this might be of interest to you. Because the lighthammer opens up a whole new world of possibilities.
The lighthammer has the sensitivity of a lightpen so it only works reliable at close range to the screen. To detect the impact when you hit the screen an accelerometer is used on the prototype version of the lighthammer (V1.0) that and the lightsensor were placed inside a 70 cent dog-toy. It worked but was far from perfect. Almost a year later I finished the lighthammer V2.0, this no longer used the complicated and troublesome accelerometer and the case was no longer a silly toy but a reliable good looking 3D printed hamer. This design is available for download so you can build it yourself.

Lighthammer V1.0

this link contains information about the
 prototype lighthammer

Lighthammer V2.0

this link contains the games and building
instructions and files of the lighthammer 2.0

Arcade cabinet

this link contains the story behind and
details of the arcade cabinet I build