MAX7219 led matrix module - Joiner Bars

If you are experimenting with the standard MAX7219 matrix modules, (pcb 32mm x 50mm approx), this is a simple joiner bar to daisy chain them together. You will need M3 x 8mm long screws and preferably M3 nyloc nuts so they don't come undone. The bar narrows to allow the soldered connections from the MAX7219 chip to be fully seated.