How useful are these displays then? Or how should I use it?
Thank you!
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Microcontrollers and digital systems
How to connect 3 display 7 segments
1.237
hace 5 años
hace 5 años
Hello Colleagues!
I have 7-segment displays (double and triple) and in both I have the same difficulties, I only find 1 only anode or common cathode for all digits, so how do I turn on the digits separately? For example, here I have a triple 7-segment display that has 22 pins (21 for the 3-digit segments and 1 that is anode for all):
How useful are these displays then? Or how should I use it?
Thank you!
How useful are these displays then? Or how should I use it?
Thank you!
hace 5 años
hace 5 años
I don't know where you see the problem, with the pins you have you can individually turn on each of the segments to form the desired number.
The only thing you can't do is turn on the decimal point.
1.237
hace 5 años
What happens is that I need two cathodes (1 of each digit) to be able to turn each digit on or off using transistors.
This is the Link where the outline of the project I am doing is listed
hace 5 años
In this scheme it is clear that two individual displays are used.
That cannot be done with collective displais like the ones it has.
1.237
hace 5 años
Of course, then there is no way to use these.
One last query, I tried to use 2 individual digits were common cathode (I need anodes), then I invested in the positive circuit by negative, turned the capacitor, turned the piezo and placed the digits well with their respective segments. But not one digit has lit up, I guess it can't work this way, right? (Because the current flows from positive to negative)
hace 5 años
The current goes from negative to positive always. because the ones that move are the electrons that are on the outside of the atoms.
In no way can common cathode displays be placed where the common anode go and vice versa.
I recommend that you learn a little about the basic principles of electronics.
1.237
hace 5 años
The current goes from positive to negative, and good thanks for the help of the displays.
hace 5 años
In no way can the electric current flow from positive to negative for the simple reason that the electrons have a negative charge and it is these that move because they are smaller and because they are on the outside of the atoms.
The proton is positive and is confined within the nucleus of the atom and cannot leave it unless the fission of the atom is prudent for which a formidable temperature and pressure is required.
1.237
hace 5 años
You are absolutely right, it is that we got so used to the conventional style, even when making electrical circuits (nodes, meshes, etc.) it was always positive to negative.
hace 5 años
That is a falacea that has its origin in the belief that where there is more you can get where there is less than zero but that is called electric current and the other is electronic that is what really occurs.
I provide a piece of information that demonstrates the truth of this.
In a thermionic lamp to produce current, a boiler electrode that is connected to the negative and one cold to the positive is required.
The heat provides the energy necessary for the electrons to jump out of the atom. and when they slam into the cathode they get to heat it by its kinetic energy.
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