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Quiz Test your Knowledge of Arduino Fundamentals: Part I: Quiz

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Author Author: tariq.ahmad
Date Created: 16 Feb 2020 5:22 AM Date Created
Last Updated Last Updated: 6 Jun 2024 4:57 PM
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Test your Knowledge of Arduino Fundamentals: Part I: Quiz

Arduino Fundamentals I

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Quiz | Arduino Day 2021 | Workshop | Digital Fever | Attack of the Drones | Project14 |Arduino Tutorials | Arduino Projects | Resource | Arduino Homepage

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beacon_dave over 6 years ago

Question 24 depends on whether or not you are 'sinking' or 'sourcing' the LED which has been connected...
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Jan Cumps over 6 years ago in reply to beacon_dave

beacon_dave wrote:

Question 24 depends on whether or not you are 'sinking' or 'sourcing' the LED which has been connected...
True. The question should show how the LED is wired. If it’s between + and pin, the answer is wrong.
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jc2048 over 6 years ago in reply to Jan Cumps

On a Nano, the schematic looks like this. I think the question might be about the on-board LED.
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m_bejstrup over 6 years ago in reply to jc2048

In that schematic the LED would only light up very dim (if at all). The 1K resistor should be more like 150R
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m_bejstrup over 6 years ago in reply to jc2048

In that schematic the LED would only light up very dim (if at all). The 1K resistor should be more like 150R
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du00000001 over 6 years ago in reply to m_bejstrup

There are a lot of LEDs these days that shine bright with 2 mA
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jc2048 over 6 years ago in reply to m_bejstrup

It's the LED marked 'L' on the board. It's not all that bright, but it's fine as an indicator on a board. I suppose that they didn't want to load the output pin too much: this way the output pin can be used for other things too.
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m_bejstrup over 6 years ago in reply to m_bejstrup

Point taken.
Maybe I'm just an old man, from a time where diode where leaded and drew 20 mA.

In any case, asking what an LED does, when connected to GPIO pin, that are driven low.
Ranges from nothing at all to damage the microcontroller (I'm talking microcontrollers in general here, not just microchip AVR controllers)
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