The STEMMA-QT LCD board is a low-power, CircuitPython-compatible, I²C-driven display that works with Adafruit’s STEMMA-QT system. It's also breadboard compatible using the included strip of extra long 0.1" pin header.
The STEMMA-QT LCD board is configured to work with 3 volt applications by default, which covers most if not all STEMMA-QT boards out there. You can also configure it to work with 5 volt devices like the Arduino by cutting and soldering the 3V / 5V solder jumper on the bottom.
The STEMMA-QT LCD board uses the BU9796 segment LCD controller to drive a custom liquid crystal display glass with 48 segments, including:
- Five indicator icons: Bell, Wifi, Moon, Arrows and Battery
- Five 7-segment digits, plus a sign indicator
- Four decimal points, one between each pair of digits
- AM and PM indicators, plus a colon for displaying the time
What's in the bag?
The STEMMA-QT LCD board comes mostly assembled, but does require some basic through-hole soldering. There are three parts in the bag
- One STEMMA-QT LCD board with all surface mount parts assembled.
- One 16-pin segment LCD, which you'll solder onto the board.
- One strip of extra long pin header, which you can use to put the display into a breadboard.
Segment LCDs are a kind of an old school technology that doesn't get a lot of love in maker projects. They have a striking, high-contrast look with great daylight readability, and they are staggeringly low power as display tech goes. But they are somewhat difficult to drive, requiring AC signals on all pins and multiple bias voltages. The STEMMA-QT LCD board simplifies the use of LCD technology in, letting you drive an LCD by writing characters and symbols over the familiar I²C protocol with easy-to-use CircuitPython library.
Unlike a segment LED display which consumes dozens of milliamperes, this STEMMA-QT LCD board consumes mere microamperes of power, even as the display remains on and showing useful data. When paired with judicious use of deep sleep, you can use this wing to make battery powered projects that last months instead of hours or days.
With five digits plus a sign indicator, four decimal points and a colon, it's optimized for displaying all kinds of data, from sensor readings like temperature to the time of day or a countdown clock. Its diverse set of indicators include icons for wifi connection and data transfer, battery status, alarm and sleep mode.