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8x8 LED Matrix - I2C Communication - Red

8x8 LED Matrix - I2C Communication - Red
8x8 LED Matrix - I2C Communication - Red
8x8 LED Matrix - I2C Communication - Red
8x8 LED Matrix - I2C Communication - Red
8x8 LED Matrix - I2C Communication - Red
  • Availabilty: Directly available from warehouse in Eindhoven
  • Model: 1088LEDMATRIX-HT16K33
  • SKU: 002916
€4.00
Ex Tax: €3.31

Led Matrix 8x8 with 3mm pitch between the LED's that can be controlled via I2C.

Specifications:

  • Supply voltage: 4.5 - 5.5V DC
  • Signal voltage: 4.5 - 5.5V
  • Chipset: HT16K33
  • I2C communication
  • Default I2C address: 0x70 (adjustable between 0x70-0x77 with the A0-A1 solder points)
  • Connector: 4p JST-XH 
  • LED color: Red
  • Pinout:
    • G: Ground (-)
    • V: Power (5V)
    • D: SDA
    • C: SCL
  • Dimensions: 32x32mm

Package contents:

  • 1x 8x8 LED Matrix with HT16K33 chip

Note: JST-XH cable is not included, but can be bought seperately: JST-XH Connector with cable - 4 Pins.

Instructions for Arduino:

  1. Install the "Adafruit LED Backpack Library" via the Library Manager in the Arduino IDE.
  2. Go to C:\Users\*Windows gebruiker*\Documents\Arduino\libraries\Adafruit_LED_Backpack_Library (or the other location where the libary is installed).
  3. Open the Adafruit_LEDBackpack.cpp file.
  4. Go to line 226 (function "void Adafruit_LEDBackpack::writeDisplay(void)").
  5. Add this function before the function "void Adafruit_LEDBackpack::writeDisplay(void)":
    void Adafruit_LEDBackpack::writeDisplayCustom(void) {
      Wire.beginTransmission(i2c_addr);
      Wire.write((uint8_t) 0x00); // start at address $00
    
      // Create a copy of the buffer
      uint16_t displaybuffertemp[8];
      memcpy(displaybuffertemp, displaybuffer, sizeof(displaybuffertemp));
    
      // Shift data to correct row
      for (uint8_t i = 0; i < 8; i++) {
        uint8_t tempbuffer3 = displaybuffertemp[i] & 0xFF;
        displaybuffertemp[i] &= 0xFF00;
        displaybuffertemp[i] |= (tempbuffer3 << 1) | (tempbuffer3 >> 7);
      }
    
      // Shift data to correct row
      uint16_t tempbuffer2 = displaybuffertemp[3];
      displaybuffertemp[3] = displaybuffertemp[5];
      displaybuffertemp[5] = tempbuffer2;
    
      // Mirror data
      for (uint8_t i = 0; i < 8; i++) {
        uint8_t tempbuffer = displaybuffertemp[i] & 0xFF;
        displaybuffertemp[i] &= 0xFF00;
        for (uint8_t k = 0; k < 8; k++) {
          if (tempbuffer & (0x01 << k)) {
            displaybuffertemp[i] |= 0x01 << (7 - k);
          }
        }
      }
    
      // Send buffer to display
      for (uint8_t i = 0; i < 8; i++) {
        Wire.write(displaybuffertemp[i] & 0xFF);
        Wire.write(displaybuffertemp[i] >> 8);
      }
      Wire.endTransmission();
    }
        
  6. Open the Adafruit_LEDBackpack.h file.
  7. Go to line 90 (function "void writeDisplay(void);").
  8. Add this function before the function "void writeDisplay(void);":
          void writeDisplayCustom(void);
        
  9. Use the function "writeDisplayCustom" instead of "writeDisplay" in all parts of the Arduino code.
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Product FAQ

Use a stable, CE-approved power supply with the correct voltage that can supply sufficient current. The maximum current that an LED can draw is indicated on the product page. Multiply this number by the number of LEDs to calculate the total maximum current. This maximum current is the minimum current that the power supply must be able to supply.

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