LCD backpacks reduce the number of pins needed to connect to an LCD.
LCDs are a fun and easy way to have your microcontroller project talk
back to you. Character LCDs are common, and easy to get, available in
tons of colors and sizes. We've written tutorials on using character
LCDs with an Arduino (or similar microcontroller) but find that the
number of pins necessary to control the LCD can be restrictive,
especially with ambitious projects. We wanted to make a 'backpack'
(add-on circuit) that would reduce the number of pins without a lot of
By using simple i2c and SPI input/output expanders we have reduced
the number of pins (only 2 pins are needed for i2c) while still making
it easy to interface with the LCD. For Arduino users, we provide a
easy-to-use library that is backwards compatible with projects using
the '6 pin' wiring. The breakout comes with a 2-pin and 3-pin terminal
block as shown (you can snap it together to make a 5-pin terminal and
then solder it to the backpack for easy wiring)
This backpack will work with any 'standard' character LCD, from 8x1
to 20x4 sizes! As long as they have a 16-pin single-line connection
header at the top. We carry a few LCDs that work great. We suggest
using our blue & white 20x4 or 16x2 LCDs. It does not work with the
16x2 OLED displays. You can try to connect our RGB 16x2 or 20x4 LCDs
up but this backpack will not control the RGB backlight so you'll have
to use the backpack only for the 14 digital IO pins (pins #1-14) and
connect the backlight pins (#15-#18) directly to your microcontroller
with 4 extra wires for color/PWM control as if they were just an RGB
For advanced users, this project can be used for general purpose I/O
expansion, the MCP23008 has 8 i/o pins (7 are connected) with optional
pull-ups, the SPI 74HC595 has 7 connected outputs.
This board/chip uses I2C 7-bit address between 0x20-0x27, selectable
with jumpers … more
|Product type||Electronics module|
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