Control Design / memory and state
Logic Gate Designer
Set ON/OFF conditions and generate an interactive logic-gate network alongside its complete truth table.
Answer first
How can I turn ON and OFF requirements into a logic-gate circuit and truth table?
Choose the input combinations that should switch the output on. The designer converts those conditions into a Boolean expression, a gate network, and a complete truth table. It helps you verify combinational behavior before selecting ICs or transistor stages. Timing, noisy inputs, output current, and safe power switching still require a hardware design step.
01 / Describe the behavior
When should the output turn on?
Choose the input conditions. Requirements within a row are combined with AND; separate rows are combined with OR. No Boolean expression is needed.
The example turns Y on when A is ON and all other inputs are OFF, or when A is OFF and B is ON. Resetting replaces your current rules; input switches stay unchanged.
02 / Test the circuit
Your generated gate network
Each AND gate checks one complete condition. Every connected requirement must be true before that rule becomes 1.
03 / Verify every case
Truth table
The highlighted row is the current input. Select a row to test it.
| A | B | Y | Test |
|---|---|---|---|
| 0 | 0 | 0 | |
| 0 | 1 | 1 | |
| 1 | 0 | 1 | |
| 1 | 1 | 0 |
From a rule to real electronics
OFF requirements use inverters, complete conditions use AND gates, and alternatives use OR gates. Gates with more than two inputs can be decomposed into cascaded two-input gates. This draws the functional network, not an IC pinout or transistor-level design.
A logic output is a signal, not a motor or relay driver. Select compatible logic voltage levels, then design a separate output stage for load current, voltage, inductive kick and heat. Mechanical switches need debouncing; unused IC inputs must not float.
Design guide
Use the result with engineering context
Technical content reviewed
When this tool is useful
- Translating written ON and OFF conditions into combinational logic
- Checking every input combination before building gates or firmware
What the result includes
- A Boolean expression and interactive logic-gate diagram
- A truth table covering every configured input combination
What the model does not guarantee
- The generated network does not model propagation delay, switch bounce, hazards, or asynchronous timing
- Logic outputs cannot drive arbitrary motors, relays, lamps, or mains loads without suitable interface and protection stages
Worked approach
Define the output row by row
List each input as a condition the circuit can observe, then mark the combinations that should activate the output. Verify the truth table before deciding whether gates, programmable logic, or firmware gives the cleanest implementation.
Common decisions
Questions engineers ask
Should I build the result with gates or a microcontroller?
Use gates when the behavior is small, fixed, fast, and easy to verify. A microcontroller fits changing rules, timing, communication, diagnostics, and larger state-based behavior.
Can a logic gate drive a relay directly?
Usually not. Check the gate's output-current limit and use a transistor or MOSFET driver, flyback protection for an inductive coil, and a power supply sized for the load.
Why might a correct truth table still fail on hardware?
Real inputs can bounce or change at different times. Propagation delay, floating pins, voltage-level mismatch, noise, and missing pull resistors can create behavior that the ideal truth table does not show.
Related build evidence
Multi-MCU Security Lock
This access-control project separates interface and electronic control responsibilities. It demonstrates control architecture; it does not claim the generated gate network appears in that implementation.
See the projectApply it to real hardware
Have a control requirement but no circuit yet?
Send the input states, timing rules, output loads, supply voltage, and failure behavior. The design can then move from Boolean logic to practical driver electronics.
Discuss the system