<![CDATA[A fellow pinhead made these 4 and 6 ball optical ball through boards.]]>A fellow pinhead made these 4 and 6 ball optical ball through boards. On my suggestion he added this feature lifted from modern Stern boards: it shows the opto statuses with LEDs. This is so damn handy in the WPC platform where going to the menus instantly kills the ongoing game, now I can quickly check what the ball trough status is if the game thinks we're a ball short. The boars have other upgrades as well, like getting rid of the huge resistors that shake themselves off the board.

The LEDs work in reverse, so a blocked opto turns off a LED. This 4 ball variant has 5 LEDs, as there's one extra to determine a ball feeder jam situation.

In the video balls are fed one by one into the ball trough and only the ball jam switch is not triggered after all 4 are in.

]]>https://board.circlewithadot.net/topic/ef7c1ad7-ef34-4b0f-8e91-36603b65bd36/a-fellow-pinhead-made-these-4-and-6-ball-optical-ball-through-boards.RSS for NodeFri, 15 May 2026 06:18:17 GMTWed, 22 Apr 2026 18:52:06 GMT60