James Stanley

Tagged: all | software | 3dprinting | electronics | bitcoin | cpu | cnc | puzzle | smsprivacy | science | chess | keyboard | metalwork | lawnmower | cryptography | pikon | rc2014 | tor | ipfs | steganography | banglejs | ricochet

Measuring motorcycle lean angle with a single accelerometer
Mon 10 January 2022
The naive method of measuring motorcycle lean angle with accelerometers is to put a 2-axis accelerometer on the bike and measure the angle between the x acceleration and the y acceleration. This only works at a standstill. When the bike is moving, the measured angle would be 0. The purpose of the lean angle is to position the resultant acceleration vector so that it points from the centre of mass to the contact patch of the tyres, otherwise you will fall over. So how can we measure the lean angle? Read more

Towards a high-resolution grid of tiny electromagnets
Tue 21 September 2021
I'd like to build a high-resolution grid of tiny electromagnets. It would work a lot like an LED matrix display, except instead of the pixels emitting light, they emit magnetic fields. I have made a small proof-of-concept, but I need help to learn more physics to improve the strength of the field and the density of the pixels. Read more

A short pendulum with a long period
Sat 8 May 2021
The period of a pendulum is proportional to the square root of its length: to double the period, the pendulum needs to become 4x as long. But actually physics has no idea how long your pendulum is, the thing that really matters is the radius of the arc that the centre of mass travels through. There's no inherent reason that we wouldn't be able to increase the radius of this arc without increasing the height of the pendulum. Read more

Chassis Design with Finite Element Analysis in FreeCAD
Tue 7 January 2020
Finite Element Analysis is a way to calculate the stresses and strains on an object in various load conditions. The object is modelled as a series of "finite elements" (in our case triangles), and then we specify the locations of points that can't move (fixed points), and the locations, magnitudes, and directions of forces that are present. Read more

Home 3d metal printing: first results
Mon 12 August 2019
A couple of weeks ago I learnt about an interesting 3d metal printing process, from a company selling it for $100k USD, and speculated that it might be DIY-able for much less. Well I now have some promising first results. Read more

Towards a Better Pythagorean Cup
Fri 4 January 2019
There was an article on Hacker News the other day by David Richeson entitled Make Your Own Pythagorean Cup. A Pythagorean cup is a cup with a built-in siphon. Supposedly invented by Pythagoras, the cup functions just like an ordinary cup as long as it is only filled to a certain level. If anyone gets greedy and tries to take too much wine, the level rises above the top of the siphon, which causes the siphon to self-start, and the greedy person is punished by having the entire contents of the cup dumped into their lap. Read more

Flat Earth and the Coriolis Force
Sun 9 December 2018
I've been learning about "flat-Earthers" recently. They're a fascinating group of people who genuinely believe that the Earth is flat and that governments, scientists, and industry are in on a big conspiracy to trick everyone into thinking the Earth is round. Read more

On the design of a herb jar lid
Mon 27 June 2016
My herb jar lid has two operating modes: one has small holes which allow you to shake the herb out slowly, and the other is a single large hole which allows you to shake the herb out quickly. Read more