Hand dryer @STEM II with 12 models

Hand dryer: you certainly won’t have anything like this in your bathroom at home, there you have a towel hanging on a hook. But in public toilets or the restrooms in restaurants there is usually an electric blower mounted on the wall for blowing your hands dry with hot air.

A good invention, particularly when the state-of-the-art appliance doesn’t even have a button you have to push to turn it on. Simply hold your hands beneath it to turn it on.

Task:

When the light barrier is interrupted, the fan should start running. As soon as the light barrier is no longer interrupted, the fan switches back off.

See full online guide with coding samples for the hand dryer model, plus extension activities

See micro:bit coding with input and output guides here

This is a specially discounted package -delivered in a clear plastic bag.

Each pack comes with thebonus fischertechik storage base (box 250 x 186)

I/O board for micro:bit

micro:bit pins extension board, designed specially to take advantage of fischertechnik’s unique, flexiblered and green round plugcable connections.By design, the I/O board rubber legsslotinto the fischertechnik black base-plate grid securely.

The price below is for 1 model out of the 12 models STEM II pack. If you want to built all 12 models, order the full STEMII packinstead.

The fischertechnik advantage

• All model parts can be reused and recycled for other projects and student’s creative pieces. fischertechnik is made in Germany with quality and precision.
• No soldering. Ideal for all ages, promote problem solving, changes on the fly as debugging and adjustment can be done instantly. All works can be done to perfection as even the smallest adjustment can be accommodated, thanks to the complete range of mechanical/structural and electronic blocks offered by fischertechnik.
• One of the 12 models of STEM 2. You can now order it on its own for easy whole class lesson, without needing to pick and sort building blocks every time.

micro:bit code

Part 1 – micro:bit block commands used in theHandDryerModel

To achieve fluency and competency in micro:bit coding, you really need to get a thorough understanding of each of the blockcatagories to be used in theHandDryer Model (see part 2 below for the full code). Fortunately, all the reference guidesare available on the BBC micro:bit web site for you to get a deeper and more comprehensive understanding and mastery.

Through every fischertechnik STEM II model (12 of them), you can learn, practise, build fluency and confidence in coding.

TheHand DryerModel used the following micro:bit blocks. You can click to lean more about each of the block catagories. The links bring you directly to the respective part of the BBC micro:bit reference document site, where live codes are included for you to understand, try, and download:

• Basic(basic micro:bit functions and actions): On Start, Show String
• Input (events and inputs from sensors): On ButtonPressed
• Loops: While Loop(repeat code while aBooleanconditionis true)
• Logic: If (conditionally run code depending on whether aBooleancondition is true or false)
• Function:Definea function,Callinga function
• Pins(Control currents in Pins for analog/digital signals, servos, i2c,…): Digital Write Pin,Digital Read Pin

Part 2 The “live”Hand DryerCode – Understand, Edit and Download

The following code has used all the mentioned blocks in Part 1 above.

Comments In English, click the ” ? ” on block to find out the comment (meaning) of the block code.

• If you read this page on a computer with wider screen size, you will be able to see the micro:bit simulator that is fully clickable.
• If you cannot see the code, such as on a mobile phone, please clickthis link instead.
• Click to open the code on the micro:bit website for further editing and modification.
• Click to download this code to your micro:bit for immediate use or to save on your computer.

Online guide

Seefull online guide with coding samples for the hand dryer model, plus extension activities

Seemicro:bit coding with input and output guides here

I/O board

Connector	No.	Description
Outputs	8	8 x light/LED 4 x DC motor – 600mA per output – 6 – 9 V
Inputs	6	5 x analog/ digital 1 x digital – signal up to 5V
I2C	1	1 x connector (SCL, SDA)
5V	1	1 x sensor power supply connection (6-9V power supply)
3.3 V	1	1 x sensor power supply connection
Battery	1	1 x battery (6 – 9 V) min 4.5 V
Power Supply	1	1 x universal power adaptor ( 6 – 9 V) min 4.5 v