Difference between revisions of "ESim/C2/Schematic-Creation-and-Simulation/English"

Visual cue

Narration

Opening Slide

Learning Objectives

• create circuit schematic
• generate spice netlist
• convert spice netlist to ngspice format
• simulate the netlist

Systems Requirements

• eSim version 1.1.2.

Prerequisites

Desktop icon

Launch eSim through Terminal

esim >> press Enter

To do so, press Ctrl, Alt and T keys together.

Now, type esim and press Enter.

eSim startup window

Click Ok.

Note that the project files created will be saved in the eSim-Workspace directory, by default.

Press “Ok” in the dialog box.

Creating New Project

Type RC >> click on OK.

In the “Enter Project name” field, type RC and click on OK.

Project Explorer >> point to RC >> Double-click >> click Open Schematic

Double-click on RC to select the project.

To create the circuit schematic, click Open Schematic button on the left toolbar.

Click Ok.

Ignore the eeschema error by clicking OK.

The Schematic editor window opens up.

Click on Place component tool >> click anywhere

Click on Place component tool from the right toolbar.

Now click anywhere on the editor.

Adding Resistor

Then select R and click on OK. Now click anywhere on the editor.

You can also do so, by scrolling the scroll button of your mouse.

Adding Capacitor

Filter field >> Type eSim_Devices >> select C >> click Ok

Type again eSim_Devices in the Filter field.

Then select C and click on OK.

Adding Sine Source

Filter field >> Type eSim_ Sources >> select sine >> click Ok

Type eSim_Sources in the Filter field,

select sine and click on OK.

Adding Plots

Filter field >> Type eSim_Plot >> select plot_v1 >> click OK >> place on editor

Place the cursor on plot_v1, right click and select copy component.

Now place it on the editor.

Adding Labels

The labels are used to name the required nodes in the circuit.

This will help us understand the netlist and connection of our circuit.

Now click anywhere on the editor.

Type IN in text field and click on OK.

Moving the components

Place cursor on resistor >> press 'M'

Rotating the components

Similarly, move the plot components and labels, as shown.

Connecting wires to the schematic

Click on Place wire button >> click sine resource and drag between Sine and Resistor >> click on it.

Click on one end of the sine source.

Move the cursor point to one end of the resistor and click on it.

This helps us to view the corresponding voltage waveforms on simulation.

Annotate the schematic

Click on Annotate button from the top toolbar.

Click on Annotate and then click on OK.

The schematic is now annotated.

Giving values to components

Click on Value.

Type 1k and click on OK.

Perform ERC check

Click on Perform electrical rules check button >> click on Run.

Click on Perform electrical rules check button

on the top toolbar bar.

Click on Run.

• and a pin is not driven to components

Close ERC

since we have used the labels for naming the nodes only.

Close the ERC window.

Adding Power Flag

It means that this pin is not driven by any power source.

To prevent this, let us place a power flag.

Click on Place component tool >> Click on Schematic editor >> Type PWR_FLAG >> click Ok >> place it on the editor

Click on the Schematic editor.

Type PWR underscore FLAG and Click OK Place it on the schematic editor.

This indicates that a power source will be connected here.

Perform ERC check

There will be only global label not connected errors, which can be ignored.

Generating Kicad Netlist

Click on Generate netlist button from the top toolbar.

Click Save

Check the option Default format and then click on Generate.

Click on Save.

Now minimise the schematic editor.

Click on Convert Kicad to Ngspice

Click on Convert Kicad to Ngspice from eSim toolbar.

Analysis Tab >> Select Transient

By default, Transient is selected.

Scroll down to enter values in the Transient analysis fields.

Inserting values

Type 0 in the start textbox.

Stop time >> 30ms

and Stop time 30 milliseconds.

Source Details Tab

To do so, click on Source details tab.

Type 5 for amplitude, 50 for frequency and 0 for both delay time and damping factor.

Press Convert button

Press the Convert button to convert the kicad netlist to ngspice netlist

Click Ok.

Close the kicad to ngspice tool

Close the kicad to ngspice tool by clicking close at the top right corner of the window.

Click on Simulation.

Close the Ngspice terminal and plot window.

Click on Plotting tab >> maximize

Maximize the Python plot window.

Check IN and OUT nodes >> click plot

Check the IN and OUT nodes and click on the plot button.

The output plot is shown in blue and input plot in red.

Multimeter Feature

Click on Multimeter >> Click on open schematic

The Multimeter window opens up, which will be on top of all other windows.

Maximise the schematic and drag the multimeter windows to the corresponding nodes of schematic.

Device Models and Subcircuits

Download code file

Click on Open Project button.

Click on Desktop >>

Click on 7805VoltageRegulator>>

Click on Open button.

Click on Open Project button from the left toolbar.

Click on Desktop.

Click on 7805VoltageRegulator.

Click on the Open button at the bottom right corner.

Double click on 7805VoltageRegulator.

Click on Open Schematic button.

In the Projects window of eSim, double-click on 7805VoltageRegulator.

Click on Open Schematic button from the left toolbar.

Show annotated 7805VoltageRegulator schematic.

Click on Convert Kicad to Ngspice.

Click on Convert Kicad to Ngspice from eSim toolbar.

Hover mouse over values entered in Analysis and Source details tab.

To do so, click on Device Modelling tab.

Device Modelling Tab

Hover cursor over Diode 1: esim_diode

Click on Add>> Double click on Diode>> Click on D.lib>> Click on the Open button.

Click on D.lib

Then click on the Open button.

To do so, click on Subcircuits tab.

Click on Add>>Double click on lm7805 folder>> Click on the Open button

Double-click on lm7805 folder and then click on the Open button.

Press Convert button.

Click Ok.

A confirmation dialog box appears. Here let's click Ok.

Click on Simulation.

Hover mouse over Ngspice plots and python plots.

Click on in1, in2 and out.

Click on plot.

Click on in1, in2 and out checkboxes in the python plot window.

Scroll down and click on plot button.

Summary

• Create circuit schematic
• Generate spice netlist
• Convert spice netlist to ngspice format
• Simulate the netlist

Forum

FOSSEE Forum

Textbook Companion

Acknowledgment

http://spoken-tutorial.org

For more details, visit this website.

Previous slide

Thank you.