After we've turned on the diode by connecting it to the batteries it is time to do the same thing, but with a diode connected to the Raspberry Pi. So it will be the Raspberry Pi that is controlling when and how is the diode turned on. Because of the Disk Image that we've burned on the SD card we would have the diode blinking when the operating system is turned on.
Необходимо е да се абонирате за FLLCasts.com, за да достъпите това видео
- #722
- 13 Feb 2018
TL. DR.
Connect a resistor to the diode. Connect system to pin 12 and pin 14. After turning on, wait for 10-15 seconds and the diode will blink.
Use of a resistor
We would have to introduce you to the electronic element - resistor. It's not the hero we want. It's the hero we need. When we connect the diode to the controller the current that would flow through the diode will burn it. We must put something that would reduce the amount of current that is allowed to flow in the system. The special element that does exactly this is a resistor. There is a lot we should mention about voltages here, but let's just leave it like this. If you want to learn more try to search on the internet for an answer to the following question: "is it the amount of current or voltage that burns the diode".
In the picture below the resistor is connected with cables to the diode
Connect to the Raspberry PI
On the picture, the white cable is attached to the longer pin of the diode. The black and white cable is attached to the shorter pin. The white cable is attached to a resistor which is then attached to a blue cable. Connect the cables in the following way to the Raspberry Pi. Blue cable to pin 12. Black and white cable to pin 14. Because you don't know the number of the pins yet, just look at the picture.
Now when you start the Raspberry Pi after a few second the diode should blink. This is an indication that the system has started and that the Raspberry PI has loaded the operating system Ubuntu Mate and is now ready to accept other instructions and execute programs.
Курсове и занятия включващи този Урок
Този Урок е използван в следните курсове и занятия.
Perfect STEM course. Module 1 - Smart Car with Raspberry PI
Disassemble a remote control car. Change the brain of the car with a smart computer like Raspberry Pi. Build a smart device with artificial intelligence that you could control from your phone and that could freely navigate itself in the real world and on the Internet. Use your hands. Develop programs for your robot and your phone. Be curious and invent.
The perfect course lives up to its name. You move through the content, we check it and return feedback to you.
In the end, you should be able to better understand how to program and design smart devices that would make the world a better place. For everybody age 12+, 16+, 21+, 35+, etc. The hardware costs about 150$. It changes through the years so it might take some time for you to find it as Raspberry PI, motor drivers, power banks and h-bridges.. they change. Note that the course was designed to be led by a teacher with a decent knowledge in embedded hardware and software. This, on the other hand should not stop you, if you are curious.
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Add a diode to indicate controller power up
On the Disk Image for the perfect course containing our modified Ubuntu Mate version, there are some special programs that will start a diode when you turn on the Raspberry Pi.
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