ohmnest

Getting started · 12 minutes

Build your first circuit

Draw a voltage divider from a blank sheet, wire its terminals and measure 2.5 V.

Follow inside the workbench ↗View the reference circuit →
Step 1

Start a blank electronics project

  1. Open Projects in the header, choose New project, then Electronics schematic.
  2. Set Project name to My first divider. Choose Schematic in the header if necessary.
  3. Use the chevron beside Components or Inspector to collapse that panel; click its labeled edge tab to reopen it. Focus in the header (Shift+F outside text fields) temporarily hides panels and instruments. Exit focus restores your layout.
Check your result

The canvas has no components. The project is named My first divider.

Step 2

Place a source, two resistors and ground

  1. Search the component library for DC voltage. Select it, then click the canvas to place V1 on the left. Press Escape to leave placement mode.
  2. Place two Resistors as R1 and R2, then one Ground. Arrange R1 above R2, leaving space between terminals. Select a part and press R if you need to rotate it.
Check your result

The canvas contains V1, R1, R2 and GND1. Each component has small terminal circles.

If you get stuck: The library remains filtered until you clear Search components. Click the actual component before rotating; Escape cancels placement.

Step 3

Set the electrical values

  1. Select V1 and set its Voltage to 5 in the inspector. Press Enter to commit.
  2. Select each resistor and set Resistance to 1k. Press Enter after each change. The inspector accepts k, M, m, u, n and p suffixes.
Check your result

V1 is 5 V, and both resistors are 1 kΩ.

If you get stuck: Parameter edits apply when you press Enter or leave the field. Here M means mega; the separate SPICE model-card editor uses SPICE suffix rules.

Step 4

Connect the circuit

  1. Choose Wire terminals in the toolbar (W). Click V1 + and then R1 terminal 1. Next connect R1 terminal 2 to R2 terminal 1.
  2. Connect R2 terminal 2 to GND1 terminal 0. Connect V1 − to that same ground terminal.
  3. Wires automatically route around symbols and labels as you move or rotate parts. If a warning says a wire needs more space, move components apart to clear their terminals; the connection is retained.
  4. Return to Select (V), then choose Check circuit connections.
Check your result

There are four wires, a grounded source return and a connected resistor midpoint.

If you get stuck: Click the terminal circles, not the symbol body. Dots mark branches on an already connected net; gaps distinguish unconnected crossings. Crossing two wires does not connect them. Branch at a terminal or use matching Named net labels.

Step 5

Run and measure the midpoint

  1. In Analysis, choose OhmNest native and DC operating point. Press Run.
  2. Open Multimeter. Select DC voltage, choose the CH A signal labelled with R1.2 / R2.1, and leave COM reference at Ground · 0 V.
Check your result

The midpoint measures 2.5 V. The source-positive node measures 5 V.

If you get stuck: Generated node names can change. Choose signals by the listed component terminals. Missing ground or a misplaced wire should be fixed before interpreting results.

Step 6

Change the ratio and keep your circuit

  1. Change R2 to 2k, then run again. The midpoint should rise to about 3.333 V: 5 × 2000 / (1000 + 2000).
  2. Use Undo to restore R2, then run again. Export circuit JSON for a local copy, or Save project after signing in.
  3. For a new account, enter your name and email and complete the I'm not a robot checkbox. Open the verification email, choose your password and confirm. Then sign in on your original circuit tab to save it. Check spam or request a new email if needed; verification links expire after 24 hours.
Check your result

You can reproduce both voltages and have saved or downloaded your circuit.

If you get stuck: Old plots remain a capture of the previous run. Rerun after editing a value.

Put it into practice ↗Choose another tutorial →