LED Bargraph interface?

[johndxmurphy]

How do you interface with an LED Bargraph? I haven't seen examples of this. Also I don't know how to program to it. I would appreciate some simple code example(s) to get me started.

 

[jmumby]

Depending on how fast you need it to be I would use a latched shift register. This way you only use a few pins but can drive 8 or more leds. Make sure you use a latched one however otherwise it looks a bit lame.

 

[Jeremy Leach]

Have you got a real bargraph in mind? How many bars? And what sort of picaxe were you thinking of driving it from?

 

[Michael 2727]

A PWM output will drive a LM3914 / LM3915 display driver.
There are many displays and display driver chips and they
all have different input and supply requirements.

You may have to supply some more details if you want a useful answer.
The more you can provide the less ping ponging before you get the answer you need.

 

[westaust55]

You do not indicate if your bargraph is a series of discrete LED's or a propientary LED package, nor if there is anything special about driving it.

However, if you had done a search on "BARGRAPH" you would have found this thread with code on what to try:
http://www.picaxeforum.co.uk/showthread.php?t=9622&highlight=bargraph

 

[BeanieBots]

Also a good idea to provide an indication of what signal you want to display.
Is it linear or logrithmic like a VU display?