Front Panel For 8 Bit Computers

Front Panel for 8-Bit Microprocessors

Features

It has these features. They may not fit your generic design. Especially since this card has to have an I2C interface.

• I2C interface (Two Wire interface - plus power and ground)
• Occupy I2C addresses either 0x20-0x23 or 0x24-0x27
• Jumper selectable base address
• Jumper Selectable I2C terminators
• I2C daisy-chain connector
• Interrupt line
  • Can be configured to interrupt on button presses
  • MCP23017 need to be set to Open-Drain output - card has pull-up to Vcc
• 4 MCP23017 16-bit I2C Port Expanders
• These are fine pitch surface mount parts
• 32 Pushbutton Switches
• 32 LEDs
• 3.3V or 5V operation

Schematic

• Front Panel Schematic Rev 1

Drivers

• I2C parts are standard MCP23017 drivers which are supported in Arduino and most microprocessors
• PSoC driver GitHub Repo