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We can use this Nasa simulator to understand better how changing the shape and angle of attack affects lift.
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Designing our own airfoil profile#
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The next step is to decide on a shape and draw our airfoil on paper.
Draw our airfoil on paper#
Draw our airfoil on paper
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Making our airfoil#
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Remove the M4 screws and nutsPlace them carefully back into the bag they came in
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Assemble the parts together with a screwdriver (Phillips) as shown
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You should end up with a part that looks like this!
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Add the microbit holder to complete it (if not already attached) Be careful with it (it clips into the assembly)
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It should end up looking like this
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A voltage divider helps us to reduce (step down) a voltage to a lower level. It’s a type of electronic circuit that looks like this.
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We can use an easy formula or calculator to find the values of resistors that we should use in the voltage divider. Try that now. If the maximum voltage from the wind turbine is 5 volts. Use the calculator to find which resistor values we will need to use in the voltage divider. One of the resistors values must be 330 Ohms. All of the columns of holes of the breadboard are connected together with metal strips. This means any wires we place in the same columnn are connected together.
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Create the voltage divider. The image below shows you how to do that. You will have to cut some wires (jumpers) to the right length. You will need to use the wago electrical connectors and the crocodile clips.
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Use the multimeter to measure your voltage divider. Following the circuit diagram shown in the image below You will need to use the wago electrical connectors and the crocodile clips.
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Go to micro:bit make code and start a new programAssembly#
Almost finished assembly#
Finished assembly#
Feeding a voltage into a micro
What is a voltage divider#
Understanding the breadboardWe can stick wires into the breadboard
Creating our voltage divider in the breadboard#
Check you voltage divider with a multimeter#
Readimg the analogue input
Connect the output from the voltage divider to the microbit#
Create your program#
Create your programVariables
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You will need to:Download it to your microbit#
Download it to your microbitInsert your usb lead
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Go to show data - device Currently the microbit reads a voltage from 0 to 3.3V and maps it to a number from 0-1023.
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To convert this back to a voltage it’s easy we just need to use this simple formula
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We need to multiply again by 2 because of the voltage divider (which reduces the voltage by half)
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Let’s adjust the program to reflect this
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We should see the serial values now appear in voltsRun the program#
Run the program
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Convert it to a voltage#
Adjust the program#