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Which leg of an LED is +? In which direction does voltage flow?

- long leg is + - voltage flow + --> -

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How to write a PWM wave to a pin? What do you use this functionality for ?

analogWrite( pin_number, value); value: [0;255] specifies % of voltage - use it to light a LED at varying brightnesses or drive a motor at various speeds - ends with the next call to analogWrite(), digitalRead() or digitalWrite() on same pin. - freq approx. 490Hz on Pins - those pins do not support digitalWrite()

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Which pins on an arduino are input and output?

- digital pins

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What does digitalRead(pin_number) return?

returns 0 if voltage < 3V returns 1 if voltage > 3V

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What does analogRead(pin_number) return? On which pins can you call it?

returns 0 if voltage = 0V returns 1023 if voltage = 5V - any value in between - only on analog pins (which are input only)

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Which voltages can damage the board?

5V connected to pins that are not VIN

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How to improve a pressure sensor made with conductive foam?

- increase the contact area between wire and foam - add casing for controlled pressure

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Why can electrodes kill?

- increase contact area to skin - decrease resistance

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What is Ohms law?

Voltage = Current * Resistance

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How can you make a knob?

Configure a potentiometer as a voltage divider.

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How to make a dimmer work/ how to not make it work?

make it work: pulse width modulation do not make it work: voltage divider -> energy gets lost at resistor (which in turn gets super hot)

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Was ist ein microcontroller ?

- designed for embedded applications - small computer on a single integrate circuit containing - a processor core, memory, and programmable input/output peripherals

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BID at Universität Potsdam

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BID at Universität Potsdam

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