초보자를 위한 littleBits 팬 비트(o13) 가이드

Quick answer

The o13 Fan Bit is an output Bit: it spins a small propeller and pushes air when it receives an ON signal. Snap it at the end of a circuit, after a power Bit and any input or logic Bits, and it becomes the moving part of your build. If you want a beginner littleBits project that feels alive, pair the fan with a button or a pressure sensor and let the air do the work.

Most littleBits projects start with light or sound, but air is the effect beginners remember. The o13 Fan Bit turns a signal into spinning blades, which makes it useful for cooling, floating, and anything that needs visible motion. The catch is that a fan is an output, so it only does something when the rest of your circuit tells it to.

This guide walks through the littleBits o13 uses that work best for new builders, how to place the Bit correctly, and the mistakes that stop the propeller from spinning. Every step includes a checkpoint so you can test before moving on.

What the o13 Fan Bit does in a circuit

The Fan Bit is an output module. It takes the signal arriving from the left and converts it into rotation. That means it behaves differently depending on what feeds it: a button gives you on/off, a pressure sensor gives you more or less spin, and a logic Bit like the XOR can decide when the fan is allowed to run at all. Before you build, decide whether you want the fan to switch, ramp, or be gated.

Because it is an output, the Fan Bit belongs at the end of the chain. If you snap it in the middle, nothing downstream will receive a usable signal. If you are not sure whether a Bit is an input or an output, look at the arrows printed on the connectors.

• Checkpoint: with power on and a button held down, the propeller should spin. If it does not, move the fan to the last position and retest.

How to build your first fan circuit

Start with a power Bit, add one input, then snap the fan on the end. A button Bit is the simplest input because it gives a clean on/off signal. Press to spin, release to stop. Once that works, swap the button for a pressure sensor and squeeze gently: the fan will respond to how hard you press, which is a much better demonstration of what a sensor does than a simple switch.

If you want the fan to react to a condition rather than a person, add a threshold Bit. The threshold acts like a toll booth: when the signal passing through reaches it, the threshold decides whether or not it can continue. That lets a sensor Bit trigger the fan automatically instead of you holding a button.

• Common mistake: stacking too many Bits before the fan. Build the smallest working circuit first, then add one Bit at a time.

Beginner littleBits fan projects to try

A desk fan is the obvious first build: power, button, fan. From there, try a paper hovercraft by taping a light paper plate above the fan and watching it lift. A mini wind tunnel works too, with a strip of tissue taped in front of the airflow so you can see the breeze. For a logic lesson, put an XOR Bit before the fan so it only runs when one of two inputs is active, not both.

If you want to trigger light, sound and motion at the same time, a branch Bit is the tool for the job. The branch Bit gives you more options for connecting your Bits: it lets you connect the output of a single Bit to as many as 3 others, oriented in different directions. Use it when you want to trigger light, sound and motion at the same time. That is how you make a fan, a buzzer, and an LED respond to one button press.

• Checkpoint: if the fan slows when you add a second output, you have overloaded the chain. Remove one output and test again.

Fan Bit troubleshooting and care

If the propeller does not spin, work backward through the circuit. Confirm the power Bit is switched on, confirm the fan is last, and confirm the input is actually sending a signal. A pressure sensor that is not being squeezed sends nothing, and a threshold Bit set above the incoming signal will block it entirely. Test each Bit in a known-good circuit before assuming the fan is broken.

Keep hair, loose fabric, and small loose parts away from the blades while the fan is running. Stop the circuit before you reposition the propeller, and store the fan Bit flat so the blades do not bend. A bent blade creates wobble and reduces airflow, which looks like a weak fan even when the circuit is fine.

• Common mistake: judging airflow by sound. A quiet fan can still move air; check with a tissue strip instead.

Fan Bit build steps

1. Step 1: Snap power, input, fan: Connect a power Bit, then one input such as the littleBits i3 button, then the o13 Fan Bit on the end. Checkpoint: the propeller spins while the button is held and stops when released.
2. Step 2: Swap in a sensor: Replace the button with the littleBits i11 pressure sensor and squeeze the pad to vary the airflow. Checkpoint: harder presses produce visibly faster spin.
3. Step 3: Add automatic triggering: Insert the littleBits i23 threshold between the sensor and the fan so the fan starts only when the signal is strong enough. Checkpoint: the fan stays off until the threshold is crossed.
4. Step 4: Split the signal: Add the littleBits w2 branch so one input can drive the fan and a second output at the same time. Checkpoint: both outputs respond to the same trigger without the fan stalling.
5. Step 5: Test and store: Run the circuit for a minute, listen for wobble, then power down and store the fan flat. Next step: try a logic Bit such as the littleBits w17 XOR to decide when the fan is allowed to run.

Bits that pair well with the fan

• littleBits i3 button: You know what a button is! It's a classic: big, round, and springy. Push to turn your creation on, and release to turn it off. The simplest way to give a beginner control over the fan, and the first input to test before adding sensors.
• littleBits i11 pressure sensor: The pressure sensor is a touch-activated Bit - give its pad a little squeeze to activate it. The more pressure you apply, the more signal it sends out. Lets the fan speed change with how hard you press, which turns a simple build into a demonstration of analog input.
• littleBits i23 threshold: Think of the threshold as a toll booth. When the signal passing through reaches it, the threshold decides whether or not it can continue. Use it to make any sensor Bit (like a temperature sensor) into a trigger Bit! Turns a sensor into an automatic trigger, so the fan can start on its own instead of waiting for a button press.
• littleBits w2 branch: The branch Bit gives you more options for connecting your Bits: it lets you connect the output of a single Bit to as many as 3 others, oriented in different directions. Use it when you want to trigger light, sound and motion at the same time. Lets one input drive the fan plus a light or buzzer, which is the easiest way to make a build feel finished.

The o13 Fan Bit rewards simple circuits. Build the smallest version that spins, confirm it works, then add a sensor, a threshold, or a branch one at a time. That habit keeps beginner littleBits projects moving and makes every new Bit easier to understand.