Making a DIY math symbol MacroPad for under £7

A macropad is a small keyboard that plugs into your PC and has custom buttons you can program yourself. As a Christmas present for a friend who tutors online, I decided to make my own macropad with each key featuring a mathematical symbol. When tutoring online, and trying to type math equations, yo…

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Improving a wind tunnel

This project is the continuation of a previous project , where I made a very rudimentary wind tunnel with a hairdryer and some wood panels. In that project, I barely covered how the wind tunnel was constructed, and the end result gave less than satisfactory results, so I am revisiting that project h…

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Designing and building a physics-based gym product for under £9

A common question I see asked in the gym is 'How many reps was that?' When you are pushing your body to the limits of what it can do, it is pretty much impossible to count the number of times you do an exercise, especially near the end of the workout. There are definitely devices that can a…

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Making an air powered cannon

I want to shoot a projectile fast. That has been my main aim for years: to track the speed of a projectile that I shot, and calculate a speed of over 100mph. Unfortunately, as I live in the UK, I cannot do this with gunpowder, and using butane or gaseous propellant still counts as a firearm after th…

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