Light, sound & motion

LED 1 (red)

Lights only when current flows into the left side (the triangle points the way). Has a 220 Ω resistor built in.

Value: 220Ω
Family: Light, sound & motion
Terminals: end (right), end (left)

Try it on the 3D workspace Reserve a kit

Press the block to see it work.

Light, sound & motion blocks

Output blocks turn current into something you can see, hear or feel: an LED lights, a buzzer sounds and a motor spins.

Circuits that use this block

First buildLight it upBattery, switch and an LED in one loop.
First buildWhat happens in reverse?The LED is turned round, so it stays dark.
First buildPress to lightA push button lights the LED only while you hold it.
First buildOne source, two pathsTwo LEDs in parallel, both with the same brightness.
First buildWhen components line upTwo LEDs in series. Together they need more than 3 V, so neither lights.
First buildAND gate: two buttons in seriesBoth buttons must be pressed at the same time.
First buildOR gate: two buttons in parallelEither button lights the LED.
Next stepSwitching with a transistorA tiny current through the base turns on the LED.
Next stepA circuit that craves lightThe LED lights in daylight and turns off when you cover the light sensor.
Next stepTurn the brightness up or downA potentiometer sets the transistor's base voltage, so it dims the LED.
Next stepTouch to activateYour finger on the X Junction pads passes a tiny current into the transistor base.
Next stepCharge it, release itThe left button charges the capacitor (the buzzer blips). The right button lets it discharge through the LED.
Next stepCapacitor delay-off timerPress the button and the LED stays on for a while after you let go.
Next stepMagnet-activated switchThe Hall effect switch lights the LED when a magnet comes close.

Other blocks in this family