https://github.com/codingabi/7segmentmultiplexing
Demonstration of segment multiplexing for a 7-segment display with an Arduino Uno/Nano
https://github.com/codingabi/7segmentmultiplexing
Last synced: 3 months ago
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Demonstration of segment multiplexing for a 7-segment display with an Arduino Uno/Nano
- Host: GitHub
- URL: https://github.com/codingabi/7segmentmultiplexing
- Owner: codingABI
- License: cc0-1.0
- Created: 2022-09-17T14:17:54.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2023-05-27T15:50:43.000Z (almost 3 years ago)
- Last Synced: 2023-05-27T16:26:11.113Z (almost 3 years ago)
- Language: C++
- Homepage:
- Size: 3.99 MB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# 7SegmentMultiplexing
Demonstration of segment multiplexing for a 7-segment display with an Arduino Uno/Nano.
Principle:
- Only one segment at the same time is enabled
- All digits uses the same segment at the same time
- Every digit, where the current segment should be shown, is enabled
- On every display update the next segment will be enabled. If the last segment is reached the next segment will be the first segment.
This technic could be used to drive a 7-segment display with a common anode or cathode (for example 4041AH):
- directly by an Arduino Uno/Nano and
- without a special display controller and
- without too much current on microcontroller I/O-pins
(Max. 40mA per I/O-pin would be allowed for an ATmega328P and 200mA for all I/O-pins in sum.
We will use only ~11mA per I/O-pin and in sum 11mA*"Number of digits" due segment muliplexing, for example 44mA for a 4 digit display)
- with only one current limiting resistors per digit and
- without brightness flickering depending on how many segments of digit are used
Disadvantages:
- We use use only 1/8 of the maximum possible brightness of the display
- We have to update the display every ~2ms to avoid flickering (for example by timer2)
Simulation https://wokwi.com/projects/342698937471205971
Video https://youtu.be/b8dgzbctinw
## Used 7-segment display
Model: 4041AH
Type: Common cathode
### Segments
### Pinout (Top view)
| Pin | 12 | 11 | 10 | 9 | 8 | 7 |
| --- | --- | --- | --- | --- | --- | --- |
| Usage | DIG1 | A | F | DIG2 | DIG3 | B |
| Pin | 1 | 2 | 3 | 4 | 5 | 6 |
| --- | --- | --- | --- | --- | --- | --- |
| Usage | E | D | DP | C | G | DIG4 |
DIG1 = Common cathode for digit on left side
...
DIG4 = Common cathode for digit on right side
## Schema
## Breadboard
