Little Inventors

John Parnum

Tostock, U.K.
1 brought to life

Job role:Retired Engineer and Inventor

Skills:Engineering, electronics, robotics, prototyping

I am a retired Mechanical Engineer with a big interest in electronics controlling mechanical things. I create my machines using wood, aluminium, plastic, DC motors, batteries, servos, sensors & Arduinos. They are designed to be not too big so I can take them into schools as a STEM Ambassador to engage & enthuse children.  My Lego Sorting Machine, Wheelie Bin Waste Robot, Local Delivery Robot, and Dinosaurs Automata have all proved popular with years 4, 5 and 6. I believe passionately in increasing STEM awareness in primary schools.

Recent project reports

The Toilet Turbine 2000
Posted about The Toilet Turbine 2000 by Joey

I added to the turbo wheel and put Joey's original drawing on the tank.  

The generator/gearbox have been improved to increase volts.  It can be demonstrated without water by just spinning the wheel clockwise.  Water demos are messy even with the large plastic box to catch the water.  You will also be constantly filling up the tank and emptying the catch box!

Prototype almost complete
Posted about The Toilet Turbine 2000 by Joey

I have enjoyed making the Toilet Turbine and it is not far from being finished. Here is a video of the prototype in use at this stage. Version 2 is the final version.

Version 2
Posted about The Toilet Turbine 2000 by Joey

My Version 2 solution has a turbo wheel mounted on ball bearings (to make it free turning) with 8 empty baked bean tins to catch the waste. Although all testing has been done using clean water, the system is designed to be capable of dealing with all types of waste.

The turbo wheel turns quite slowly so I needed to speed up the generator shaft using some gears. A voltmeter connected to the generator shows the voltage being generated as it turns. There was much testing to get everything working. It has probably taken 40 hours of perseverance.

Ideas brought to life