Showing posts from August, 2014

Pi Wars

I'm thinking about entering Pi Wars in December. It's a Raspberry Pi based robot competition.

So far, I've scrounged a few bits and pieces, and put together a really basic remote control system using a Playstation 3 controller, an L293 H-Bridge driver board and an Arduino. The Raspberry Pi can do PWM and USB/Bluetooth, so it can take the place of both the laptop and the Arduino, when I get that far.

There are a few bugs, as I mention in the video, related to input handling. Basically if I play with it too much, the motor gets stuck (usually at maximum speed) and I appear to stop getting events from the joystick char device. But for now, here's a short video.


And now for something completely different.Someone asked the question the other day - what's the CO2 cost of the concrete in a Wind Turbine?You need 1000 tonnes of concrete to install a wind turbine
You create a total of 410 kg of CO2 per m3 of concrete
Concrete has a density of 2.4 tonnes per m3
=> One wind turbine requires 416 m3 of concrete
=> You can attribute 170 tonnes of CO2 to the wind turbine's concrete
baseAssume a turbine base lives for 20 years.
Assume the turbine generates 2MW watts max
Assume an average utilisation of 30%
=> in 20 years, the turbine will generate 105.2 GWh=> concrete production adds around 1.6 tonnes per GWh (Or 1.6 grams per KWh) to wind power.
If you make electricity using an fossil fuel power station, you create:Coal: 910 g/KWh
Gas: 390 g/KWh(The UK average across all fuel types, including renewable and nuclear)
is 470 g/KWh.So, the effect of the concrete on CO2 emissions is negligible, compared
to traditional power plants.As an asi…