Stop LED Expression 192

Stops, LEDs and expression

A board combining three 8×8 stop banks, LED feedback and four expression inputs. A single module handles switch scanning and illuminated stop indication.

• 192 switching points across three 8×8 banks.
• Three MAX7219 LED-matrix drivers.
• Four analogue expression inputs using an MCP3204 ADC.

The 5 V LED supply and the 3.3 V logic bus use separate power networks.