BID at Universität Potsdam
Flashcards and summaries for BID at the Universität Potsdam
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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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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.
Exemplary flashcards for BID at the Universität Potsdam on StudySmarter:
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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