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LED Display
Prof. Betty Lise Anderson
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Here’s what you’re going to build
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Need to learn some things
How to read an electrical schematic What parts we’re using How design the display How to build the display
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Reading Schematics:
Battery
What’s this?
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How about this? Resistor
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What’s this? Diode
Lets current flow one direction but not the other
YES
X
NO
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Will current flow?
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How about here?
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And here?
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Let’s take a look at the components
16-segment alphanumeric display Green, yellow, or red
18-pin package There is one LED
inside for each segment
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How to read the data sheet This page is general
propaganda
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Next is dimensinos
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Ah hah! What’s inside
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This is called the pinout
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Absolute maximum ratings
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Electro-optical characterisitics
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Additional information
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What value of resistor?
What is voltage across the diode? Hint: look at electro-
optical characteristics
How much is left to go across the resistor?
+ 2V -
+
7V
-
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V=IR I= current R=resistance Don’t exceed 25 mA
through diode see absolute
maximum ratings)
What are tradeoffs in choosing current?
+ 2V -
+
7V
-
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So, what will you choose? R=V/I Example:
V=7V Choose I=20 mA
0.020 Amps R=7/0.02=350 Ohms
We don’t have that But we have
something close
+ 2V -
+
7V
-
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So here’s what you’ll build
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Figure out what to write
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The breadboard
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The buses Every hole along this
green line is electrically connected
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There are four buses you can use
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All rows connected too
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To connect to your devices Recommend putting
displays across center channel
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To make connections One end of wire is
connected to the bus And anything else
connected there
Other end is connected to one pin
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Now, look at circuit diagram Need to make these
connections
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Negative bus and safety resistor
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Connect positive
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Now, look at circuit diagram Need to make this
connections What pin is this on the display?
All anodes connected to a common point at this pin
Which pin is the common anode? Connect pin 18 to the positive bus
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Connect common anode to positive bus
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Another negative bus will come in handy
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Next, connect cathodes One resistor for
every segment you want to light?
Where do you connect them?
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Connect resistor for every cathode you need to ground
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OK, once it’s working
Repeat for every other segment Once done, remove safety resistor