• 4-bit binary calculator
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This took me two days from start to finish, after playing around with the power system in my base I moved out the the desert and began work. I first had to make a diagram of the circuit so I used Simulator.io, if you want to check it out you can view it here. The first section is the logic, this is the brain of the build. Images are found here: https://imgur.com/gallery/AtMsv47 The logic uses four half adders which are made up of two X-OR gates, two AND gates, one OR gate and, four electrical branches. Each half adder has two inputs, one Carry In input, one output and, one Carry Out output. IN A and IN B are outputs from two switches, OUTPUT sends power the a celing light I'm using to display output. C-IN is the carry-over input, this is connected to the C-OUT (carry-over output) of the last adder, unless it is the first adder, then the branch just has no input connected. The second section is the input, its just eight switches each connected to a lage battery and a large solar panel. One down side of this is the first two use more power than the second two, the second two use more power than the third pair and so on. The third section is the display, all I'm using is four celing lights. The lights represent a 4-bit binary byte, when a light is on it represents a 1 or HIGH, when off it is a 0 or LOW. My next project will be building two seven-segment displays and a controller to hook into the outputs and display the number in a readable form.
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