| id | chapter4-input |
|---|---|
| title | Input |
| description | Input page in Chapter4 of CircuitVerse documentation. |
Circuitverse features different input elements listed below:
The Input circuit element can have two input states - HIGH or LOW.
Property attributes that can be customized within the PROPERTIES panel include BitWidth.
You can verify the behavior of the Input circuit element (by clicking on the circuit element once) in the live circuit embedded below:
<iframe width="500px" height="400px" src="https://circuitverse.org/simulator/embed/11920" id="projectPreview" scrolling="no" webkitAllowFullScreen mozAllowFullScreen allowFullScreen ></iframe>The Button circuit element is a simple push button mechanism for controlling the output of the circuit.
- HIGH when pressed
- LOW when released
You can verify the behavior of the Button circuit element in the live circuit embedded below:
The Power circuit element in the circuit design is always in a HIGH state. This component should be used when there is a need for the input to be always HIGH.
In the live circuit embedded below, multiple LEDs are arranged in the form of "HI". As the LEDs are all connected to the **Power** circuit element, they will always glow. <iframe width="500px" height="400px" src="https://circuitverse.org/simulator/embed/9554" id="projectPreview" scrolling="no" webkitAllowFullScreen mozAllowFullScreen allowFullScreen ></iframe>
The Ground circuit element in the circuit design is always in a LOW state.
While in AC power distribution and some radio antenna systems the “ground” implies a connection to the earth, in digital logic design "ground" is a point in the circuit that the user calls as zero volts. The ground in the circuit is used as a reference for measuring voltages across different points in the circuit.
The ConstantVal circuit element allows the user to input a constant value (instead of 0 and 1).
<iframe width="500px" height="400px" src="https://www.youtube.com/embed/DON063zxYmcc" id="projectPreview" scrolling="no" webkitAllowFullScreen mozAllowFullScreen allowFullScreen ></iframe>As the above example explains, the value of the ConstantVal circuit element can be changed by double-clicking the component and entering the value in the prompt.
The value of the Stepper circuit element can either be increased or decreased by pressing the "+" key or "-" key on the keyboard to increase or decrease the value.
You can verify the behavior of the Stepper circuit element in the live circuit embedded below:
<iframe width="600px" height="400px" src="https://circuitverse.org/simulator/embed/107525" id="projectPreview" scrolling="no" webkitAllowFullScreen mozAllowFullScreen allowFullScreen ></iframe>The Random circuit element generates a random value in the range (0, maxvalue) every time it receives a HIGH signal from the clock. It has 3 ports in total:
- Max Value: input, maximum value generated.
- Clock: input clock element. Every time the clock receives a HIGH input, the random element generates a number.
- Random Value: output, the number generated.
The value is also displayed in decimal notation on the random element.
You can verify the behavior of the Random circuit element in the live circuit embedded below:
<iframe width="600px" height="400px" src="https://circuitverse.org/simulator/embed/12041" id="projectPreview" scrolling="no" webkitAllowFullScreen mozAllowFullScreen allowFullScreen ></iframe>The Counter circuit element is a binary counter that runs from zero to a specified maximum value. It has five ports in total:
- Max Value: input, maximum value that the counter will reach.
- Clock: input clock element, every time the clock gets HIGH the counter increments by one.
- Reset: input, when HIGH it resets the counter to zero.
- Zero: output, it's HIGH when the counter is zero.
- Value: output, value of the counter in binary.
The value is also displayed in decimal notation on the counter element.
You can verify the behavior of the Counter circuit element in the live circuit embedded below:
<iframe width="500px" height="400px" src="https://circuitverse.org/simulator/embed/12036" id="projectPreview" scrolling="no" webkitAllowFullScreen mozAllowFullScreen allowFullScreen ></iframe>A Pull Resistor is a passive circuit element used to stabilize floating inputs by forcing them to a known logic level — either logic high (1) or logic low (0) — when no active signal is driving the line.
In digital circuits, floating inputs can cause unpredictable behavior. A pull-up or pull-down resistor ensures consistent logic values for such undriven nodes.
Properties that can be customized in the PROPERTIES panel include:
pullDirection,Direction
| Name | Description |
|---|---|
inp |
The single pin that both receives input and applies the pull logic when the signal is floating (undefined) |
The Pull Resistor component only activates when the connected input is floating (i.e., its value is undefined). It does not override actively driven signals.
The pullDirection property allows users to choose between:
Pull-Up(sets floating input to1)Pull-Down(sets floating input to0)
The Direction property lets users rotate the component using the PROPERTIES panel or the arrow keys.
Consider the following setup:
- An Input component is set to logic
1. - This input is connected to the input pin of a Tri-State Buffer.
- A Button controls the enable pin of the Tri-State Buffer.
- A Pull Resistor is connected between the output of the Tri-State Buffer and the final output node.
| State | Output Value |
|---|---|
| Button pressed | 1 (from Input via Tri-State Buffer) |
| Button not pressed | Pull Resistor sets output to 0 (Pull-Down) or 1 (Pull-Up), depending on configuration |
This example illustrates how the Pull Resistor provides a default logic value when the Tri-State Buffer is disabled (output is high-impedance).
This is especially important in circuits where a component may temporarily disconnect from a line, and you still need that line to remain at a defined logic level.