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22 Nov, 2016
Yellow signal problem in US 4 way signal mode
While the board works for 4 way operation in the UK mode it does not work properly in the US mode via switch K1. When wired following the directions for 4 way operation in the US mode, the red and green signals work fine but the yellow signal does not. For the added 4 way signal the yellow signal comes on after the red one, not the green one. I experimented trying to find an alternate wiring to correct the problem but could not find one. I ended up using an Arduino controller for the signals. Since the signals are wired with the common lead positive, I use a hex voltage chip (74LS04) to make them compatible with the Arduino controller.