Complete Logisim-evolution projects: CPU builds, controllers and practical circuit designs.
4-bit Calculator Project in Logisim-evolution A 4-bit calculator ties together three things you have already met: adders, multiplexers, and displays. The result is a complete mini-project you can demo: two 4-bit inputs, an operation switch, and the answer on hex displays. Architecture Inputs: two 4-bit input pins, A and B, plus a 1-bit SUB select…
Digital Lock in Logisim-evolution A digital combination lock is one of the most popular digital-design course projects: the circuit stays locked until the user enters the correct digit sequence (say, 3-1-4), then it asserts an unlocked signal. It is a finite-state machine, so the same ideas from our sequence detector tutorial apply here. Design: states…
Vending Machine Controller in Logisim-evolution Alongside the traffic light, the vending machine is one of the classic finite-state-machine course projects: coins go in, the machine tracks the total, dispenses the item, and returns change. It exercises everything — state encoding, D flip-flops, and combinational output logic. Define the problem first Keep the spec small enough…
Traffic Light Controller in Logisim-evolution The traffic light controller is the most popular digital-design course project: a finite state machine that cycles two directions through green → yellow → red with realistic timing. Step 1: Define the states A minimal two-direction controller needs four states: North-South green, East-West red North-South yellow, East-West red North-South red,…
Sequence Detector (101/1101) in Logisim-evolution Detecting a bit sequence like 101 or 1101 in a serial stream is the standard finite-state-machine lab. The design method is always the same: Step 1: Draw the state diagram For a 101 detector you need three states: S0 (no progress), S1 (just saw “1”), S2 (just saw “10”). From…
From Simulation to Real Hardware: Run Your Circuit on an FPGA Here is the moment simulation becomes real: the circuit you drew in Logisim-evolution — the same gates and wires you have been testing on screen — can be turned into configuration data for a physical FPGA chip. Press a real button on the board,…
Single-Cycle MIPS Processor in Logisim-evolution The single-cycle MIPS datapath is the most-taught processor design in computer architecture courses: every instruction completes in exactly one clock cycle. This guide maps each block of the classic textbook diagram to a real Logisim-evolution component, so you can build the thing the lectures only draw on slides. This is…
How to Build a Simple CPU in Logisim-evolution A CPU looks intimidating until you see that it is only two halves: a datapath that moves and transforms numbers, and a control unit that tells the datapath what to do, step by step. This guide walks through an 8-bit accumulator machine — the smallest design that…
