I2C/SPI Communication - Using OpenSegment - Learn.

Home » Arduino Uno I2c High Speed Mode » I2C/SPI Communication - Using OpenSegment - Learn.

Maybe your like

Contributors: Nate Share Use this URL to share: Share on Tumblr Submit to reddi Share on Twitter Share on Facebook Pin It

I2C/SPI Communication

If you need to control lots of displays at the same time, OpenSegment has the ability to communicate over I2C and SPI.

I2C Communication

I2C pins

I2C communication requires 4 pins: SDA, SCL, PWR, and GND.

I2C side pins

The I2C pins are labeled on the edge of the backpack and on the sides to make it easier to chain many displays together.

The default 7-bit I2C address is 113 in base10 or 0x71 in HEX or 01110001 in binary.

Heads up! 0x71 is the 7-bit I2C address. If you are using a different language than Arduino you will probably need to add the Read/Write bit to the end of the address. This means the default read address for the OpenSegment is 0b.1110.0011 or 0xE3 and the write address is 0b.1110.0010 or 0xE2. For more information see our tutorial on I2C

OpenSegment supports standard 100kHz as well as Fast 400kHz I2C speeds. Use the following code to enable Fast I2C within Arduino:

Wire.begin(); //Join the bus as controller. //By default .begin() will set I2C SCL to Standard Speed mode of 100kHz Wire.setClock(400000); //Optional - set I2C SCL to High Speed Mode of 400kHz

Checkout the I2C examples on GitHub for good code to start from.

You can find many more I2C examples here on GitHub. There are sketches to show you:

  • Basic counting
  • Changing the I2C Address
  • Changing the brightness and other settings

SPI Communication

SPI pins

Bank of SPI pins

SPI communication requires 6 pins: SDO, SDI, SCK, CS, PWR, and GND. We may add a feature in the future, but for now OpenSegment does not pass data out of the SDO (serial data out) pin and can be left disconnected. If you’re hooking multiple OpenSegments together on the same SPI bus, the CS pin on each display must be connected to a different GPIO on your microcontroller.

You can find many more SPI examples here on GitHub. There are sketches to show you:

  • Basic counting
  • Changing the brightness and other settings
Share Use this URL to share: Share on Tumblr Submit to reddi Share on Twitter Share on Facebook Pin It View as a single page Next Page → Counter/Analog Modes ← Previous Page Serial Example

Tag » Arduino Uno I2c High Speed Mode