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Topic: A three digit seven segment display (Read 968 times) previous topic - next topic

arduinohabib

Hi all I just got a couple of three digit seven segment displays, I was planning to make a device that displays temperture readings on a three digit seven segment display, but I just noticed that each three digit SSD has twelve pins, the seller said there were three common grounds, and one pin that does not connect to anything. How do I controll each segment seperatly? eg. display three different numbers on each digit?
Thanks
What is man's best friend? The breadboard!

CrossRoads

Your device will be something like this.
Write a loop that drives an anode, and sinks a cathode.
Continue for all 7 or 8 anodes.
Repeat for the next cathode.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

arduinohabib

You mean display one digit, then the other, ect, and the Arduino is so fast that you can't tell?
What is man's best friend? The breadboard!

tuxduino

It's the same principle behind led dimming with pwm: you turn a (fast) light source on and off so fast it looks continuously lit to the human eye. The higher the ratio between on and off time, the brighter the light will look.

arduinohabib

What is man's best friend? The breadboard!

Hippynerd

Its called Persistence Of Vision. It works because you can turn them on and off many times within a second, It happens so fast that you can not tell that its flashing.

https://en.wikipedia.org/wiki/Persistence_of_vision
https://sites.google.com/site/rgbledcubes

arduinohabib

What is man's best friend? The breadboard!

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