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The 7 segment display is found in many displays such as microwaves
or fancy toaster ovens and occasionally in non cooking devices. It is just
7 LEDs that have been combined into one case to make a convenient device for
displaying numbers and some letters. The display is shown on the left. The
pinout of the display is on the right.
 
This version is a common anode version. That means that the positive
leg of each LED is connected to a common point which is pin 3 in this
case. Each LED has a negative leg that is connected to one of the pins of
the device. To make it work you need to connect pin 3 to 5 volts.
Then to make each segment light up, connect the ground pin for that led to
ground. A resistor is required to limit the current. Rather than
using a resistor from each LED to ground, you can just use one resistor from Vcc
to pin 3 to limit the current.
The following table shows how to form the numbers 0 to 9 and the letters A,
b, C, d, E, and F.
'0' means that pin is connected to ground. '1' means that
pin is connected to Vcc.
| |
a (Pin 1) |
b (Pin 10) |
c (Pin 8) |
d (Pin 6) |
e (Pin 5) |
f (Pin 2) |
g (Pin 9) |
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
|
1 |
1 |
0 |
0 |
1 |
1 |
1 |
1 |
|
2 |
0 |
0 |
1 |
0 |
0 |
1 |
0 |
|
3 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
|
4 |
1 |
0 |
0 |
1 |
1 |
0 |
0 |
|
5 |
0 |
1 |
0 |
0 |
1 |
0 |
0 |
|
6 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
|
7 |
0 |
0 |
0 |
1 |
1 |
1 |
1 |
|
8 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
9 |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
|
A |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
|
b |
1 |
1 |
0 |
0 |
0 |
0 |
0 |
|
C |
0 |
1 |
1 |
0 |
0 |
0 |
1 |
|
d |
1 |
0 |
0 |
0 |
0 |
1 |
0 |
|
E |
0 |
1 |
1 |
0 |
0 |
0 |
0 |
|
F |
0 |
1 |
1 |
1 |
0 |
0 |
0 |
|
