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Post: Hi, thanks once more for the prompt reply... This has helped with the erratic behaviour, but still does not seem to work as expected.It would be simplest to describe if I could upload a short video of the breadboarded design, is this possible? My best attempt otherwise would be :Button 1 just lights the relevant led, as the valve output is already off.Button 2 lights the relevant led, and turns the proper output on too, all looks good.Buttons 1 and 2 repeatedly toggle the correct leds and output.But when I press button 3, output to relay 1 goes off. Same for button 4, etc.Each button pair seems to work individually, for one valve output at a time, but they also turn off any other valve outputs that are "on" at that time.any button press (using pins on bus2) sets all the pins on bus 1 to off.I'm not sure if that all makes sense or not? I'm aware that the code isn't elegant, but it's so simple I can't see where it goes wrong? ( I have found a couple of pin numbering errors, but these do not cause the issue above. The loop runs sufficiently fast that each button press is caught about 15 times.Sean