Category Archives: Uncategorized

Autonomous Rover

Semi-autonomous rover navigated successfully between preprogrammed coordinates (geolocations).

Throttle is still manual during testing for safety. The Rover hardware was built on an old remote controlled toy car. Controllers, servos, motors and motor controller is buffed up with modern high current electronics all controlled by the PixFalcon with a GPS/Compass sensor. The flight controller is programmed through QgroundControl v3.

The Riddled Barcrawl

The game is more of a structure for a series of riddles, quizzes or games, to take out and about in bars for a fun night out.

4-12 persons can participate. If more than 6 pers, pairs can be formed. The number of pairs+1 is the number of venues to visit throughout the night.

Each person or pair creates a riddle for the others to solve. The answer to the riddle must lead to a bar, restaurant or other venue, where the next riddle can be presented.

In this way a series of riddles, each solved at a separate venue lead the group around town. While the entire route remains a surprise to everyone along.

An ‘assistant’ – not taking coming along the trip – lays out the order of venues through the trip. This serves the purpose in order for the group to move around town in a short rational path.

For this assistant to know the venues selected, every person or pair inform this assistant (and only the assistant)

Once the route is laid out, the assistant makes a deck of envelopes for the group to bring on the trip. The envelopes are numbered 1..n. Each envelope contain only the name(s) of the next person or pair to present their riddle or quiz.

The sign for MAKE:lab

To test the accuracy of the plasma cutter mounted on the KR150 industrial robot arm, we did the sign for MAKE:lab

Although its rough on the edges, it proved a nice easy and efficient way to cnc-cut large sheets of metal.

 

The Lego Game

Take your box of Lego and sort a number of exact similar piles. The number of piles should match the number of players. I recommend storing the pieces in separate bags for later use.

Now each player has  a handful of pieces, say there are 16 in each pile for example.

1: Now the first player makes a little arrangement of 4 selected pieces from his own pile. While doing so he hides his pieces behind a standing open book or in his lap under the table.

2: When all players are ready, he shows the arrangement in the middle of the table.

3: At the moment the arrangement is shown the other players can copy the arrangement as fast as possible. But!

4: At any moment any of the players copying can say stop, and everyone has to stop building.

5: The copies are now compared to the original and minus points are given for misplaced pieces.

6: Points are noted, and the next player makes an arrangement now with 8 pieces. (repeat from 1)

Finally: The points are summarized such that the weight of points are relative to the number of pieces.

Notes: It can be troublesome to calculate points, so give and take a bit or just rate the figures quickly looking for similarity, then throw points by the paper-sissor-stone method: showing a number of fingers at them simultaneously (one figure at the time – fairplay)

-The fun part here is to just build arbitrary lego figures and train the 3D perception.

Bike -> E-Bike conversion – mechanical transmission

A onedayproject to convert my bike to e-bike.

Well the one day was making the transmission and it was running 50km/h in the afternoon (in a private area) -the more careful design of battery packs and safety systems came later.

It is powered by around 40-50V running a BLDC motor of 290Kv and rated max 1800W. The transmission is gear ratio of around 1/11 (as I recall) -but still the motor runs too slow at low speed driving.

It very lightweight and cheap to build but you need a BLDC controller and I recommend the VESC designed by Benjamin Vedder.

I also recommend having brakes that are stronger than the motorsetup, so the fail happens to the mechanics – not the driver..

For additional details just ask or check out my Thingiverse post

Electric Boat Motor

My diesel motor broke down, so I designed and installed  an electric motor drive.

Great about this project is the way I used different prototyping techniques to fab the timing pullys, and the alu frame.

And even more great is that compared to the diesel engine which had 4 separate liquid systems and electric system – this has just one electric system, and it doesn’t pollute or require any maintenance.

It charges on solar panels 20V boosted up to 60V for the 4x12v batteries (series) that provide the electric power. -I have even been sailing on sun alone 😉

V.1 10kW BLDC 150KV 45-52V 86Ah direct drive – not working 🙂

V.2 10kW BLDCmotor 150KV 45-52V 86Ah timing belt over cast pullys. Worked ok but at low rpm for the motor, causing high current draw.

V.2 25kW BLDC motor 50KV 45-52V 86Ah same timing belt setup, this works perfect from 150 w just driving the boat in harbour without current or strong wind up to approx 2000W in canals etc.

If you are interested in more details, just ask.

I will try to get some shots from the current installation.. to show the pulley setup.