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rpi-led-matrix

Python / C control for a LED matrix

Goal

Create the software for a hardware project which can drive a LED matrix with a extendable number of rows and columns

Hardware

To drive the rows, the MIC2981 driver IC is used. It can source up to 500mA per pin, which mean 25 columns @ 20mA / column. To sink the columns, the TPIC6C595 is used. I needs to be able to sink one column (20mA) per pin, so for an 8 bit shift register the total IC must be able to sink 8*20mA. The TPIC6C595 is able to sink up to 100mA per pin. The rows should multiplexed, i.e. they should not be one at the same time.

Software

Suitable candidates:

Notes to selfs

  • If multiple rows are active, current is split / LEDS are in parallel with respect to the sinking column.
  • We probably need a resistor per sink / column

On the subject of the LED matrix 3D model

For this model, we use two programs: OpenSCAD and FreeCAD. OpenSCAD is used to program the model. To make the model readable for KiCad:

  1. Open FreeCAD
  2. Select View->Workbench->OpenSCAD
  3. Open the *.scad file (File->Open)
  4. In Combo View->Model->Labels & Attributes->2088BS select union
  5. Go to File->Export
  6. Export the model as a STEP with colors (*.step *.stp)

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