You probably know the monochrome matrix, which often shows with red LED tickers. This portfolio is complemented by a bicolor LED (means 2 colors of red and green is created by mixing an orange) matrix of Adafruit.
The matrix is controlled by an I2C backpack, which makes it very easy to connect to the Particle Photon.
Before soldering the matrix on the backpack with the 4 PINs I did a dry run with pure mating. Hereby I got to know the alignment of the matrix: on the backpack a round dot is filled in and marks the starting position; on one side of the matrix is printed a label (............... T1242), which must point in the direction on the back of which the lettering of "From Adafruit" can be seen.
Further details can be found on the Adafruit website.
After Ground (GND) and VCC have closed the circuit via the photon, the connection to the photon is still to be established via I2C. To do this, connect via the jumpers Wire D0 (= SDA) and D1 (= SCL).
I did not directly have the right jumper ends at hand and helped myself with breadboard.
The Particle WebIDE provides a library (#include "adafruit-led-backpack.h") so the available example can be used immediately.
The video shows how to use one of the examples (8x8-bicolor.ino): text alignment can be affected by matrix.setRotation(3);
You can imagine typical threshold signaling with red and green, as well as emotions with the smileys. In sum, a not very cheap display for the available area of 64 LEDs with only 3 colors.
Calculates for soldering quite a time slot of 20-30 minutes.