Stages

11-3USB or BatteriesKeep U1 running—from USB when it's plugged in, from the batteries when it isn't

Power off

Parts

  • Diode (pick a part) (choose values)2/2 left

Goals

  • With USB plugged in, U1 runs (4.0 V or more)
  • The batteries rest while USB is plugged in
  • With USB unplugged, U1 runs on the batteries

Rules

  • Don't push current into the dry cells
  • Don't burn out the diodes
  • No short circuits
USBUSB 5 V5V3 × AA4.5VMCU U1−+−+GNDVCC

Selected

Press a terminal (the small ◯) to start a wire. Press where you want to bend to place corners, and finish on another terminal or on a wire. Press the middle of a wire and then somewhere else to draw a branch from there. You can drag parts and wires to move them. When you are ready, press "Run!" to turn on the power, and try the switches while it is on.

Line mode

Keys

W
Draw wire
R
Rotate
M
Move
G
Drag
Del
Delete
⌘Z
Undo
⌘⇧Z
Redo
Enter
Run
Home
Fit
H
Hint

Wheel to zoom, right-drag to pan