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> Please, who can help me to program a PCF8574. What is wrong in the program given below. What makes you think, there is something wrong? In other words: please describe what you do, what you observe then and what you'd expect instead. > I like to turn a stepper connnected to P4-P7 (of the PCF8574) when a switch) connected to P3 is depressed. P0/P3 are connected with a pull-up to 5V . By pressing the switch P3 will be connected with a pull-up to 5 V Shouldn't the switch connect P3 rather with 0V? > please refer to [1] > please refer to [1] > please refer to [1] > [1] Messen, Steueren, Regeln mit dem C-Control/BASIC System von Kainka (page 163 u.w.) Do you expect everyone to own this book? Bye Achim |
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