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Post: Having just bought and stacked a couple of IO Pi Plus cards, I'm ready to hook 'em into my model railroad program and drive some relays. I'm rooting around, trying to find some C code that will show me how to do that. I've found a nice explanation in [url=/forums/thread/152/multiple-buttons-lighting-multiple-leds]multiple buttons lighting multiple leds[/url] but it's written in python and has code such as [pre][code]from ABE_helpers import ABEHelpers from ABE_IoPi import IoPi i2c_helper = ABEHelpers() i2c_bus = i2c_helper.get_smbus() # create the two buses bus1 = IoPi(i2c_bus, 0x20) bus2 = IoPi(i2c_bus, 0x21) # set bus 1 to be inputs bus1.set_port_direction(0, 0xFF) bus1.set_port_direction(1, 0xFF) #....etc[/code][/pre] which I can't use in C. I haven't had a look at the ABE_helpers file(s) to see if I can "borrow" some code to translate into C. A much better solution would be to find a similar example in C code which can point me in the direction that I need to go. Can anyone help with a nice, clear example, please? I imagine that it will involve downloading from [url=https://github.com/abelectronicsuk]abelectronicsuk[/url] / [b] [url=https://github.com/abelectronicsuk/ABElectronics_C_Libraries]ABElectronics_C_Libraries[/url] [/b]