Mpu Battery
what type of LED light is good to use to display a percentage of some total ?
The LED should be "bar-like"and will be used to display total battery level in connection with an 8-bit mpu. For example if there are 10 bars and the max battery level is 5V, then the when the battery level is 4 V then the 1st 8 LED bars should be on.
Interesting question.
I know I have one, never experimented with it.
A Google search for [led bar graph]
http://www.google.com/search?hl=en&q=led+bar+graph&rlz=1R2GGLL_en&aq=1&oq=led+bar&aqi=g10
The third Site down on the above Search is:
LED Display'sLED Bargraph, 10 LED Bargraph Displays.
The LED bargraph displays are at the bottom of this page:
http://www.futurlec.com/LEDDisp.shtml
Available in RED for $0.30 each.
or YELLOW for $0.40 each.
or MULTI-COLOR for $0.75 each.
You also need a driver for it:
[led bar graph driver]
http://www.google.com/search?hl=en&q=led+bar+graph+driver&rlz=1R2GGLL_en&aq=3&oq=led+bar&aqi=g10
The 2nd Site down:
LM3914 - Dot/Bar Display DriverLED driver outputs are
current regulated, open-collectors ... A single pin changes
the display from a moving dot to a bar graph.
http://www.national.com/mpf/LM/LM3914.html
At this supplier, you have to buy a minimum
of 20 pieces @ $ 0.99 each.
I will leave this for you to look at.
Lets try this one:
IC DOT/BAR GRAPH DISPLAY DRIVER - LM3914NOrder 'ic dot/bar graph display driver - LM3914N' online from Digi-Key. ... Order 'ic led display driver 40dip - MM5451N' online from Digi-Key.
They want you to call them for a price.
The part # = LM3914N-ND
I guess that I will stop here.
Hope that this was enough'
Wingman
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