lamaPLC: HT16K33 display controller

The HT16K33 is a memory-mapped, multi-function LED controller driver. The device supports a maximum of 128 display segments (16 segments and 8 commons) and a 13×3 Maximum matrix key scan circuit. The software-configurable features of the HT16K33 make it suitable for a wide range of LED applications, including LED modules and display subsystems. The HT16K33 is compatible with most microcontrollers and communicates via a two-line bidirectional I²C bus.

• Operating voltage: 4.5V–5.5V
• Integrated RC oscillator
• I²C-bus interface
• 16×8-bit RAM for display data storage
• Max. 16×8 patterns, 16 segments, and eight commons
• R/W address auto-increment
• Max. 13×3 matrix key scanning
• 16-step dimming circuit
• Supports 20/24/28-pin SOP package types

The base I²C address for an HT16K33 is 0x70, but it can be changed to one of seven other addresses by setting the four address pins (A0-A3) via hardware. Each HT16K33 chip can have a unique address from 0x70 to 0x77. If multiple HT16K33 devices are used on the same bus, each must have a distinct address, and if you use more than one, their addresses must be sequential, such as 0x70, 0x71, 0x72. 

12*8 display application: (No INT pin function and 10*3 key function):

The HT16K33 uses standard I²C pins. Connect your display as follows:

You will need two libraries from Adafruit:

• Adafruit LED Backpack Library
• Adafruit GFX Library

Install these via the Arduino Library Manager (Tools > Manage Libraries…).

This sketch demonstrates basic numeric display and colon control using the Adafruit_LED_Backpack library.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"
 
// Create the display object (Default I2C address is 0x70)
Adafruit_7segment matrix = Adafruit_7segment();
 
void setup() {
  matrix.begin(0x70);  // Initialize with I2C address
  matrix.setBrightness(10); // Set brightness from 0 to 15
}
 
void loop() {
  // 1. Display a whole number
  matrix.print(1234, DEC);
  matrix.writeDisplay();
  delay(2000);
 
  // 2. Display a floating point number
  matrix.print(12.34);
  matrix.writeDisplay();
  delay(2000);
 
  // 3. Simple Counter with blinking colon
  for (uint16_t counter = 0; counter < 100; counter++) {
    matrix.println(counter);
    matrix.drawColon(counter % 2 == 0); // Blink colon every other tick
    matrix.writeDisplay();
    delay(200);
  }
}

https://docs.arduino.cc/libraries/simple-ht16k33-library/

https://www.digikey.com/htmldatasheets/production/2070902/0/0/1/ht16k33.html

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