https://github.com/agjendem/rpi-7segment

rpi-7-segment
https://github.com/agjendem/rpi-7segment

7segments hardware-libraries python raspberry-pi

Last synced: about 1 month ago
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rpi-7-segment

• Host: GitHub
• URL: https://github.com/agjendem/rpi-7segment
• Owner: agjendem
• License: mit
• Created: 2019-10-31T10:37:41.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2019-11-07T11:59:25.000Z (about 5 years ago)
• Last Synced: 2024-11-15T01:59:43.499Z (about 2 months ago)
• Topics: 7segments, hardware-libraries, python, raspberry-pi
• Language: Python
• Homepage:
• Size: 8.79 KB
• Stars: 0
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
Software to control 7-segment displays.

# Software:

Based on code found in the comments section of the [SparkFun Hookup Guide](https://learn.sparkfun.com/tutorials/large-digit-driver-hookup-guide/discuss). Thanks to [Member #910971](https://www.sparkfun.com/users/910971) and [Member #642108](https://www.sparkfun.com/users/642108).

This code is further improved to easily support multiple displays, as well as text/numbers, with scrolling.

# Hardware:

Tested with the following hardware:

* [7-Segment Display - 6.5" (Red)](https://www.sparkfun.com/products/8530)

* [SparkFun Large Digit Driver](https://www.sparkfun.com/products/13279)

* [RaspberryPi 4](https://www.raspberrypi.org/products/raspberry-pi-4-model-b/)

* [SN74AHCT125N Quadruple Bus Buffer Gates With 3-State Outputs](https://www.ti.com/store/ti/en/p/product/?p=SN74AHCT125N)

* [Adafruit Perma-Proto HAT](https://www.adafruit.com/product/2310)

It is likely to work with other variants, home made displays and/or drivers based on [TPIC6C596](http://www.ti.com/lit/pdf/slis093), as well as other voltage converters for signal, for example the [SparkFun Logic Level Converter](https://www.sparkfun.com/products/12009).

12v power to the displays are provided externally.

## Build instructions:

https://learn.sparkfun.com/tutorials/large-digit-driver-hookup-guide/all

In our case, we swapped the Arduino with a RaspberryPi 4. As the Pi operates with 3.3v signals on the GPIO compared to the 5v of the Arduino, the signal lines (clk, latch, data) needs to be adjusted via a logic level converter.

# Defaults:

Segments class parameters, based on the [Raspberry BCM pinout](https://pinout.xyz/):

* bcm_gpio_clock=11 *(CLK)*

* bcm_gpio_latch=13 *(Signals when to switch to the next display)*

* bcm_gpio_data=14  *(TXD - used to turn each segment on/off)*

* num_displays=7 *(The number of displays you've chained)*

* debug=False *(Turns on debug output to console)*

* offline=False *(Deactivates the actual GPIO-parts, used mainly for dev/tests)*