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The SPI_LCD board
The SPI_LCD board

This is the documentation page for the SPI_LCD and I2C_LCD boards.


Assembly instructions

The board comes fully assembled, as depicted in the picture on the top right of this page..

We assemble the ones with LCD with just a pin header between the board and the LCD, so you could do the same. Make sure you put the LCD in correctly. I'm not sure everything survives the wrong polarity.

Recommended configuration
Recommended configuration
Also possible
Also possible
Not recommended configuration
Not recommended configuration

Possible Configurations

The second SPI port can be used as an ICSP connector. You need to toggle the solder jumper for this.

External resources


The fet:

The CPU:

Additional software

Related projects


For the SPI connector see: SPI_connector_pinout.
For the I2C connector see: I2C_connector_pinout.


The only LED is a power indicator.

Jumper settings

There are two solder jumpers. The one between the two 6-pin SPI connectors controls the function of the SPI connector furthest from the CPU.

In the default configuration the second SPI connector is a daisy-chain connector for the SPI bus.
In the other configuration, the second SPI connector is the ICSP connector.

There is a 10 mil (very small) PCB trace in the solder jumper in the default configuration. You'll have to cut this trace to move the solderjumper to the other position. If you later decide you want the other configuration again, some solder-wick can be used to remove the solder from one position and then it can be added to the other position.


For the intro to the SPI and I2C protocols read: SPI versus I2C protocols

The board specific protocol can be found here: spi_lcd 1.3_protocol spi_lcd_1.2_protocol i2c_lcd_protocol

You should also read the General_SPI_protocol notes.

For arduino, a sample PDE is available, called ardemo_lcd.pde, also at BitWizard software download directory .

This is a demo to send things using SPI to the lcd board. The SPI routines there are applicable for LCD boards as well.

The software

Future hardware enhancements

Future software enhancements

  • Lock the address. (require a sequence of commands to change the address).



  • Initial public release