I2C

RPisPLC Hardware setup

Hardware setup

You must connect at least one portexpander module (with a pca9555) on the Raspberry Pi board!

How to connect the hardware to the Raspberry Pi B+ board.

Picture Hardware Connections

Raspberry Pi Connection

Raspberry Pi B + used sockets.

RPisPLC I/O test board

Test board

Test board for Gnublin Port Expander.

Picture Test Board

Schematic

Picture Schematic test board

 


 

RPisPLC Digital 24Volt interface

Digital Input/ Output interface card

Digital Input/ Output interface card with 8 inputs 24 V DC and 8 outputs 24 V DC; 0.5 A galvanically isolated, and with LED status indicators.

Digital input/ output modules permit connection of the RPI board to digital signals of the process and the output of digital signals from the RPI board to the process.

 

Raspberry and I2C Interface

Raspberry and I2C Interface

For coupling the embedded Linux board to various types of devices, relays and sensors an expansion board is needed. Here you can find more information on how to do this.

I2C interface

With two wires it possible to address up to 1136 members. I2C is a synchronous bidirectional communication system that allows devices to transfer data using only two wires: a bidirectional data line (SDA) and a clock line (SCL).
Max clock rate: 400kHz.
The I/O board contains a PCA9555.

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