Computer Science, Crafty, Electricity, Electronics, Engineering, Logic, Milestones, motor skills, Simon teaching

Simon building an 8-bit Computer from scratch. Parts 1 & 2.

Parts 1 and 2 in Simon’s new series showing him attempting to build an 8-bit computer from scratch, using the materials from Ben Eater’s Complete 8-bit breadboard computer kit bundle.

Simon is learning this from Ben Eater’s playlist about how to build an 8-bit computer.

In Part 1, Simon builds the clock for the computer
In Part 2, Simon builds the A register (more registers to follow).
these little black things are an inverter (6 in one pack), AND gate and OR gate (4 AND and OR gates in one pack)
this schematic represents the clock of the future 8-bit computer
Simon and Neva thought the register with its LED lights resembled a birthday cake
Electricity, Electronics, Logic, Simon teaching

Simon has been bitten by the hardware bug again!

It’s all Ben Eater‘s fault! Simon is more of a software and pure math champion, but Ben Eater’s videos have sparked Simon’s interest in logic and electronics, anew. Back in mid July (yes, I know, I’m a little behind with the blog), while waiting for his Complete 8-bit breadboard computer kit bundle to arrive from the US, Simon was playing with virtual circuits that he built on two wonderful platforms: and You can view Simon’s page on Circuitverse at

Simon’s favourite was building the Master-Slave JK Flip-Flop

Simon gave me a whole lecture on the differences between Sequential and Combinational Logic: in the former, there’s a presence of a feedback loop (the output actually goes back to somewhere else in the circuit), and the latter has everything going in one direction (the inputs come in and the outputs go out).

It’s a little bit like the difference between a Feed Forward neural network where the output only depends on the input and a recurrent neural network where the output also depends on what the output was previously,

Simon explained.

Here’s a problem with sequential logic circuits: they go crazy like this very often (confused NOR gate). That’s why most sequential logic circuits have a clock in them. A clock acts like a delay so that it won’t go crazy.

That’s the power of sequential logic: you can have the same input but a different output. This is useful for storing data: I release the input, but the data is stored. It can only be archived in sequential logic.

The delay comes in error detection (on the rising edge of the square wave).

Master-Slave JK Flip-Flop

The following circuits are buit in Logicly

SR Latch in
D Flip-Flop
SR Flip-Flop
Master-Slave JK Flip-Flop
Simon building circuits together with his uncle whom he has met for the first time (Russian)
chemistry, Crafty, Experiments, Together with sis

MEL Chemistry Experiments: Making Batteries

We did two more experiments a couple days ago: Liquid Wires (creating a simple circuit using graphite and liquid glass, a sodium silicate solution) and making our own Zinc-Carbon Battery, a chemical source of electric current that relies on an oxidation-reduction (redox) reaction between manganese dioxide (MnO2) and zinc (Zn). 

A redox reaction involves the transfer of electrons from one element (the reducer) to another element (the oxidizer).

Our battery is divided into two sections, separated by wadding: one section holds the oxidizer MnO2 and the other contains the reductant Zn. When the crocodile clips are connected to a diode, the circuit is closed and the reaction can begin: electrons start migrating from the zinc section to the manganese section (manganese dioxide mixed with graphite o make it a better conductor). We used ammonium chloride NH4Cl as the electrolyte.

Arduino, Coding, Electricity, Electronics

Arduino to relax

Last week Simon suddenly unpacked his old electronics sets and completed several projects with Arduino, his old single-board friend that got him into coding a little over a year ago. Back then it was the most difficult stuff he had ever tried, his first “setups”and “draws”, his first dive into serious circuits. Now Arduino (and iCircuit) is something he does while taking breaks from the real studying/ coding. Amazing how skillful he has become in assembling the circuits, too. All those little wires. Especially considering he still isn’t an expert at tying his shoelaces.





Coding, Electricity, Electronics, Physics

Back to circuits

Yesterday Simon asked me to buy new electronics software he found on the internet. It’s a realtime circuit simulator and editor called iCircuit. Simon has already built several circuits in it last night and there is so much more to discover. He was following Derek Banas’ tutorials on electronics.

Coding, Electricity, Electronics, Lego

Lego WeDo

After he tried it during a Digisnacks group session last month Simon really wanted to have his own Lego WeDo set. The waiting seemed endless, Sinterklaas lost the parcel once and worried if it would reach Simon on time, but in the end everything worked out magically well. And even though the drag and drop programming seems to be too easy for Simon, we enjoy watching him complete the laborious projects all by himself. He didn’t use to be this dexterous with the tiny Lego pieces just a few months ago, his fine motor skills are improving by the day. In fact his piano teacher just told me exactly the same thing about his piano fingers yesterday.






Crafty, Electricity, Electronics, Soldering, Together with sis

Conductive Painting

We made a talking poster with Bare Conductive paint and touch board today:


The poster on the wall next to Simon’s room:


This is how we made it. We taped a stencil to a large sheet of white paper and applied the conductive paint, then waited for the paint to dry.



While waiting, we loaded several mp3 files on to the MicroSD card that came with the touch board. Simon made sure the files were named in the right order, to correspond to the correct electrodes on the touch board. We found the sound files at


Simon placed the MiscroSD back into the touch board:

We carefully removed the stencil, this was the result:

We attached the touch board and the speaker to the poster, then cold soldered the holes in the electrodes with conductive paint.

Let it dry and turn the power on!




Crafty, Electricity, Electronics, Experiments, Physics, Soldering

Simon draws series and parallel circuits with conductive paint

Simon loves the conductive paint. After we finished making the Bare Conductive Voltage Village kit (previous post), he made two circuits, parallel and series, on his own without and help on my behalf. He did use weak AAA batteries first, so it didn’t work. When I told him he should switch to the 9V batteries, his circuits started to shine!


This is Simon’s parallel circuit:


And this is a series circuit:


Crafty, Electricity, Electronics, Milestones, Soldering

Cold soldering with Bare Conductive electric paint

On Sunday Simon found a Bare Conductive electric paint set in his shoe. Sinterklaas knows exactly what Simon wants! Today we tried cold soldering for the first time! The project involved building a paper house that would gradually light up as it gets darker in the room.



Besides the light sensor (or a Light Dependent Resistor), the circle also incorporated a transistor, a resistor and two LEDs.


It was quite difficult to keep all the components in place while the electric paint was still wet.


The waiting was enduring.


Tried blowing on the paint to make it dry:


Finally, the fun part: drawing the circuit:


The roof of the house on the inside:



Simon loved the effect of the gradual lighting up – when first placed in a dark room we saw almost no light but when we came back a couple hours later the house looked magical. Simon cuddled with it, took the roof off and reviewed the circuit again and again, and put the house next to his bed when falling asleep. I think we’d want to crawl inside of it if he could.