## Working with probability theory

We have struggled a bit with probability theory, and made this gadget to select random numbers. We then compared it to manual random numbers using dice. Then we entered it into a spreadsheet and analysed the data up against each other. One of our kids build the number selector with dad.

You can see our recordings and progress here:

## Real Life School

After finding and examining the school offer https://skolenivirkeligheden.dk/ we wrote to a few companies, that our kids found interesting. https://www.brusch.dk/ wrote to us that we were welcome to come by and get a tour around their company. They make technical precision solutions for a large range of companies and areas, such as space travel, medical, energy and science. They have a factory in Denmark where they use robots and precision machinery to produce products mainly in titanium, aluminium, silver, cobber and plastic.

Our kids found it very interesting and a good way to get to see an area of work you usually don’t get to know about in your daily life. We try to show our children as many areas of life and work opportunities, as possible, to give them as varied a view of life and the opportunities they have. This can help them, when they have to choose career direction and also give them an understanding of other peoples lives and how things around them are produced.

## Electronic synthesizer

We examined sound waves and an Electronic Circuits, by putting together a small keyboard.

The synthesizer is build around the NE555 timer chip and a resistor-ladder.

Parts

Diagram

Below is a screenshot from »Engineer’s Mini-Notebook« by Forrest Mims from 1984. This version uses a lot of different capacitors which makes it more expensive. The previous DIY version shown above is very cheap compared to this one.

## Zero Waste electronics

One of our children is very fond of learning and making electronics with her dad. She is a very quick learner, 11 years old now. A friend of ours gave her this job – describe and connect all the wires and I’ll pay you a wage.

It is reverse engineering of a printed circuit board. The pieces has been reused from old electronics he already had at home or from dumpster diving.

## Metal project

My husband had for a long time wanted to make the periodic table more easily understandable, and got the idea that by working with the most common everyday used metals, we could actually touch the atoms.

We have had a few different versions of the periodic table on our wall for many years, but got a new more clear version given, so we decided to take the old ones down and put that clearer and larger one up in our living room.

That started a collection of little metal fragments, that the kids put up on the table by the correct metal.

Then my husbands holiday came, and we had the time to do a metal project. He made a specification sheet that they should fill out for every metal we worked with.

Monday we talked about iron. A metal easy to recognize and plentiful in our surroundings. He had made a iron coil earlier around an iron pole, so we got the chance to also do the Ørsted experiment again.

Tuesday we talked about gold. He told the story about the King who wanted to make sure the crown he had ordered was completely made of gold, and how Archimedes helped him solve that problem. We also looked at the stock exchange quotes for metals in the newspaper (Børsen).

Wednesday we talked about copper. Copper is widely used for wires used for electronics, so we had the chance to measure electric circuits on our Oscilloscope and our newly made Joule Thieves. After the lesson at home, we went to The Technical Museum in Elsinore and saw the original Ørsted Compas from 1820 (see photo). We also saw an Exhibition dealing with our extreme use of mobile phones today, which also take great use of copper and a large number of other metals.

Thursday we talked about aluminium. Many of our pots and pans were made of aluminium. Aluminium is very thermally conductive, so good when cooking food, to get a high heat quickly and to get back to a low heat quickly too.

Friday we went on a field trip to the local Metal Scrap Yard. We had made an appointment earlier with an employee there, who were kind enough to show us around on a guided trip.

## Life in the Dream House with Arduino

How do you introduce knowledge about electronics in the Home School? Well, try to find a project that the children would like to use it for. In our case, it turned out to be lighting our Barbie house and installing different types of gadgets. We got really far today, but have still got some way to go.

Testing that the lights work individually.

Preparing the wires.

Sorting out all the connections at the back, so that the front only shows the lighting and gadgets.

Technical drawing of electrical installations.

This is how it looks on a daily basis.

## Maker Space with glory to workmanship and reuse 2018-09-30

A very important part of learning, is to be exposed to different things. As a child, you do not know all the different possibilities there is in life. We try to expose our children to as many different areas of learning as possible. Then they will have a greater opportunity to choose for themselves what to engage in. To find out what interests them.

In the past few years there has come a lot of offers to children, regarding learning about electronics, which is more and more palatable. One of these offers is Maker Space Copenhagen. There the children can see a fusion of methods used in craftmanship fused with electronics.

On the picture above, the children could see a 3D printer and examples of what it could produce and how it worked.

On the picture is shown a selection of trash that the children could use to create new things with.

On the picture above, a dolls house was build out of cardboard and then some electronic gimmicks was applied to the house.

Often Maker Space also takes the environmentally outlook on how we consume. It is all about reusing.

At this Maker Space there also was a section on biological aspects of creating. You could for example make your own mushrooms growing kit and many other growth projects to learn about biology.

## Electric-motor model, compas with three wires across it, Ørsted

We placed a compas on a wooden board. Pulled a wire across it with a circuit breaker/push button, so we could turn on and off the power. We then pulled two more wires more than 120⁰ apart (evenly distributed), also with a  circuit breaker/push button. We then pushed the buttons alternately, so that the magnetic field changed, and thereby made the compass needle turn around. This is electromagnetism, as Ørsted discovered in 1820. It is used  in most electrical appliances we use every day.

We also were so lucky that my dad had a old electric motor model we could test with and examine a coil and a iron core.