Feature(may vary by option.)

●This version of the LED backpack is designed for two dual 14-segment "Alphanumeric" displays. These 14-segment displays normally require 18 pins (4 characters and 14 total segments each)
●This module solves the annoyance of using 18 pins or a bunch of chips by having an I2C constant-current matrix controller sit neatly on the back of the PCB
●The controller chip takes care of everything, drawing all the LEDs in the background. All you have to do is write data to it using the 2-pin I2C interface
●There are three address select pins so you can select one of 8 addresses to control up to 8 of these on a single 2-pin I2C bus (as well as whatever other I2C chips or sensors you like)
●The driver chip can dim the entire display from 1/16 brightness up to full brightness in 1/16th steps. It cannot dim individual LEDs, only the entire display at once

[Red]

[Orange]

[Green]

Description

Product parameters
Product size: 50.94mm * 27.88mm * 11.93mm
Working voltage: 5V (3.3V relatively dark)
IIC address: default address 0X70
Nixie tube size: 0.54 inch

Pin description
C: Serial clock line
D: Serial data line
-: Supply voltage negative
+: Positive level of supply voltage
+: IIC level control terminal (connected to 3.3V or 5V)
A0, A1, A2: IIC data address control terminal
IIC address calculation: 0X70+A0+A1+A2 (suspended is 0, welding A0 is 1, A1 is 2, A2 is 4, for example, A0, IIC address at A2 welding=0X70+1 +4=0X75)