assembly of the expansion board with inputs cards

    Before connect the inputs boards configure :

      - SPI address of each board.

      - Operating Voltage (3,3V or 5V)

    Before connect the expansion bridge configure :

      - Operating Voltage (3,3V or 5V)

simulation

expansion board mount

The first board to connect to the expansion board - Input Board

Technical Specs :

• Input Volatge : 3V3 or 5V.
• Digital Input : 16.
• All entries remain logic high level with the 10K ohms pull-up resistor. When shorting the input terminals (protected with a diode in series) the logic level change to low.
• Interface with the Arduino : MCP23S17 (SPI Bus).
• Programable interrupts : 2.
• Lenght : 68.58 mm.
• Widht :  62.23 mm.

Schema

Simulation

Prototype

Connect Arduino UNO + expansion bridge + expansion board

( Beta version )

First prototype

How to connect the Arduino Uno with the expansion board : The Expansion bridge.

The expansion bridge is an Arduino Shield that connect the Arduino UNO with the expansion board.

 

Simulation

 Technical specifications

 - Independent +5V for the expansion board.
 - Independent +3V3 for the expansion board.
 - Real time clock DS1307.
 - Level converter to adapt the voltage in case of use Arduino Zero (+3V3).

Schema

What is expansion board for Arduino ?

expansion board for Arduino is an interface rack that you can connect four inputs/outputs boards.

Dimensions : 119.38 x 68.58 mm.

 Simulation

 
Description pins from Arduino Uno :

Schema