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This is ingenious. With the low price
of arduino clones, this makes a lot of sense.
On 4/07/18 12:50 AM, Tom, wb6b wrote:
I want to expand the amount of digital and analog I/O pins
available to add enhancements to my uBITX.
To do that I created a Smart LCD Backpack to replace the commonly
found ones on the inexpensive 2x16 and 4x20 I2C displays found on
eBay and Amazon.
I uploaded a library to GitHub that allows you to program a
Arduino Nano to emulate the common I2C to parallel backpack used
on the I2C displays. The Smart I2C Backpack, additionally, allows
you to read and write the analog and digital pins on the Smart I2C
The package includes a interface library that you include in your
code to interface with the Extended I/O functionally. Also
included are two example Sketches. One is the code you program
into the Smart Backpack. The other is a demo/test program you
program into another Arduino and connected via the I2C buss to the
Smart Backpack Display.
The Smart Display Backpack should work with firmware using
standard I2C LiquidCrystal drivers such as the KD8CEC firmware.
The code uses the following libraries:
The are all installable from the Arduino library manager, the
GitHub URLs are just for reference.
Hope others enjoy this new display and I/O expander.
I believe these are part of the base Arduino software install.
Here is the link to the code.