LEDs anschließen

Der folgende Beitrag soll eine kleine Hilfe beim anschließen von LEDs an elektronischen Komponenten wie zum Beispiel am Arduino sein.

Beim Anschluss einer LED ist es am besten das Datenblatt der verwendeten LED genau zu lesen. Dort werden die Werte der LED benannt, die Ihr zum Anschluss benötigt. Die im Beitrag verwendeten Daten beziehen sich auf Standardwerte und können je nach Typ eurer LED abweichen.

Beim Anschluss der LED ist auf die Polung zu achten. Standart LEDs in 3mm/5mm Ausführung haben die Beine unterschiedliche längen. Daran lässt sich erkennen, welches Anode und welches die Kathode ist. Das längere Bein ist die Anode (+ Pol) und das kurze Bein ist die Kathode (- Pol). Desweiteren findet man in der Regel eine Abflachung am Kunststoff der LED auf der Kathodenseite. Die LED muss mit der korrekten Polung angeschlossen werden, da die Diode sonst sperrt. LEDs haben eine sehr geringe Sperrspannung und eine Überschreitung kann zum sofortigen Zerstören der LED führen.

Jede LED muss mit einem entsprechenden Vorwiderstand betrieben werden um den Strom auf, den im Datenblatt angegebenen, Betriebsstrom zu begrenzen.

Beispiel:

Eine rote LED mit einer Durchlassspannung von 2.1V und einem Betriebsstrom von 20mA soll an eine Versorgungsspannung von 5V angeschlossen werden.

Somit ergibt sich der Vorwiederstand $R_{v}= \frac{U_{b} - U_{D}}{I_{B}} = \frac{5V - 2.1V}{0.02A} = 145 \Omega$

Somit wäre der nächst größere Wiederstand der E15-Reihe zu verwenden: Rv = 150 Ohm

In diesem Zuge sollte man die Verlustleistung die am Widerstand abfällt beachten. Bei Schaltungen mit mehreren LEDs kann diese die Leistung des Widerstandes überschreiten.

Die Verlustleistung wird folgendermaßen errechnet: $P_{v}=\frac{U_{R}^{2}}{R_{V}}=\frac{5V-2.1V}{150\Omega }=0,056W$

Standardmäßig erhältliche Widerstände haben eine maximale Verlustleistung zwischen 0,25W bis 1W

14 thoughts on “LEDs anschließen”

1. Pingback: Arduino – Blinkende LED | Tekz

2. My husband and i have been absolutely relieved Peter could finish up his investigation through the precious recommendations he received from your very own web site. It’s not at all simplistic to simply possibly be freely giving hints that other people have been trying to sell. And we acknowledge we need you to be grateful to for that. Those illustrations you’ve made, the simple blog menu, the friendships you help to promote – it’s most fantastic, and it’s making our son and our family recognize that this matter is interesting, which is exceedingly indispensable. Many thanks for everything!

3. Hey There. I found your blog using msn. This is a very well written article. I’ll make sure to bookmark it and return to read more of your useful info. Thanks for the post. I will certainly comeback.

4. You made some nice points there. I looked on the internet for the topic and found most persons will consent with your site.

5. I discovered your blog site on google and check a few of your early posts. Continue to keep up the very good operate. I just additional up your RSS feed to my MSN News Reader. Seeking forward to reading more from you later on!…

6. We stumbled over here different page and thought I should check things out. I like what I see so i am just following you. Look forward to looking into your web page again.

7. Can I just say what a relief to find someone who actually knows what theyre talking about on the internet. You definitely know how to bring an issue to light and make it important. More people need to read this and understand this side of the story. I cant believe youre not more popular because you definitely have the gift.

8. Spot on with this write-up, I actually assume this website wants much more consideration. I’ll in all probability be once more to learn far more, thanks for that info.

9. Hey There. I found your blog using msn. This is an extremely well written article. I’ll be sure to bookmark it and come back to read more of your useful info. Thanks for the post. I will definitely return.

10. I’ve been surfing on-line greater than 3 hours as of late, but I never discovered any interesting article like yours. It is lovely worth sufficient for me. In my view, if all web owners and bloggers made good content as you did, the web will probably be a lot more helpful than ever before. “Truth is not determined by majority vote.” by Doug Gwyn.

11. I have been examinating out a few of your articles and i can state pretty good stuff. I will make sure to bookmark your blog.

12. There are certainly numerous details like that to take into consideration. That is a nice level to convey up. I supply the ideas above as normal inspiration however clearly there are questions just like the one you convey up the place a very powerful factor can be working in trustworthy good faith. I don?t know if finest practices have emerged round issues like that, however I am sure that your job is clearly recognized as a good game. Both boys and girls really feel the affect of just a second’s pleasure, for the rest of their lives.

13. wonderful submit, very informative. I ponder why the other experts of this sector do not realize this. You must proceed your writing. I’m confident, you’ve a huge readers’ base already!

14. Hiya, I am really glad I have found this information. Today bloggers publish only about gossips and net and this is actually annoying. A good site with exciting content, this is what I need. Thanks for keeping this website, I will be visiting it. Do you do newsletters? Cant find it.