Reference
This reference guide explores essential Arduino libraries needed for LED Keypad Shield functionality, details the I2C communication protocol for driving digital tubes, and provides supplementary schematic references for further hardware integration insights.
Library
Please install the following libraries for this code to function.
LedKeypad Arduino library About Library installation.
Communication Protocol Description
The LED Keypad Shield uses I2C to drive the digital tube. The I2C clock line is SCL(A5) and the I2C data line is SDA(A4).
Other Supplementary Information
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