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Library for running 7-segments displays with TPIC6C596 drivers

Project description

Software to control 7-segment displays.


Based on code found in the comments section of the SparkFun Hookup Guide. Thanks to Member #910971 and Member #642108.

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


Tested with the following hardware:

It is likely to work with other variants, home made displays and/or drivers based on TPIC6C596, as well as other voltage converters for signal, for example the SparkFun Logic Level Converter.

12v power to the displays are provided externally.

Build instructions:

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.


Segments class parameters, based on the Raspberry BCM pinout:

  • 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)

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