**Bottom right is where I use my Arduino to connect 5V to the breadboard and of course Arduino to ground. are usually implemented as DIP switches similar to those found on many. Logic gates are in order (left to right) XOR-AND-XOR-AND-OR In CMOS logic families logic 1 is very near 5 volts, and logic 0 very near 0. I finished it today and as stated before, I have no unconnected inputs so where am I experiencing "floating inputs"? I thought if I just finished the build I surely wouldn't end up with any unconnected inputs because the build requires use of all of them. Yesterday I hadn't completed the build yet and I sure had tons of unconnected inputs coming from the logic gates causing problems. If we all had the same mindset the creators of. I got a ton of good help and we came to the conclusion that it was most likely "floating inputs" from the CMOS logic gates causing problems. No wonder humanity can never win in post-apocalyptic settings. I made another post yesterday regarding the same problem. ![]() I've used all of the inputs of the logic gates so there shouldn't be any "floating inputs" coming from the logic gates? I have used pull-down resistors on the switches too. A 4-bit adder requires 8 XOR gates, 8 AND gates and 4 OR gates. SACE Emax 2 power circuit breakers and switch disconnectors. I am using 74HC86 for XOR gates, 74HC08 for AND gates and 74HC32 for OR gates. The weird behaviour I am experiencing is with the LEDs seemingly arbitrarily turn on/off depending on how close my fingers are to also seemingly arbitrary parts of the circuit. The actual circuit/logic works as intended, meaning the 4-bit adder does what it is supposed to do. Please read textbook page 131 section 3-9 Multiplexers before implementing this lab assignment. ![]() This circuit will select one output from four inputs based on two addition switches. I just finished building a 4-bit adder on a breadboard and I am experiencing some quite odd/erratic behaviour and I am wondering why. Create a 4-1 MUX using ONLY tri-state buffers and inverters in LogicWorks.
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