Yet another illustration guide, how to wire the MAX7219 on 8 Bit 7 Segment Digital LED Display driven by MAX7219. The MAX7219 is an integrated serial input output common-cathode display driver which is connected to microprocessor or microcontroller along with the 8 bit 7 segment digital LED display. This module you also place the LED Graph display LED or 64 separated LED. Includes an on chip type B BCD encoder a multi-channel scanning loop, segment WORD driver, and also an 8×8 static RAM that stores each data. This chip is only one external register can be used to set the current of each LED segment.
The MAX7219 has integrates a convenient four wire serial interface that can be used to all micro-controller, microprocessor. Each on-chip data can be addressed in the update without rewriting all display, and also allows you to select each data encoding or no-coding.
The entire module device includes a 150μA low power shut off mode, analog and digital brightness control, scan limit register allows you to display 1-8 bit data, and LED light detection mode.
Feature:
0.36 inch
Common cathode
Only need three IO ports can drive 8 bit digital tube
The module compatible of 5V / 3.3V microcontroller (51 / AVR / STM3) and Raspberry Pi
Schematics Diagram
Wiring Illustration Guide
Sketch Code
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/* 14CORE TEST CODE 8BIT LED TUBE http://www.14core.com pin 12 is connected to the DataIn pin 11 is connected to the CLK pin 10 is connected to LOAD */ #include "LedControl.h" LedControl lc=LedControl(12,11,10,1); void setup() { Serial1.begin(9600); // Initialize the MAX7219 Serial.write("14CORE TEST CODE FOR LED MAX7219 LED TUBE"); lc.shutdown(0,false); // To Enable the Display lc.setIntensity(0,15); // To set the brightness level (0 is min, 15 is max) lc.clearDisplay(0); // To Clear the display register //} } void loop() { // test afisare un anumit text lc.clearDisplay(0); // To Clear the display register lc.setDigit(0,7,2, false); // To display the 2 first column on the left (column 7) lc.setDigit(0,6,5, true); // To display a 5 column 6 and decimal point lc.setDigit(0,5,4, false); // To display a 4 column 5 lc.setRow(0,4,B1001110); lc.setDigit(0,2,3, false); // To show the 5 on 2nd lc.setDigit(0,1,7, false); // To Place a 0 in the column 1 lc.setRow(0,0,B0110111); delay(3000); // fac alt text lc.clearDisplay(0); // Clear display register lc.setDigit(0,7,1, false); // To display a 1 at the first column on the left (column 7) lc.setDigit(0,6,2, false); // To display a 2 column 6 and decimal point lc.setRow(0,5,B00000001); lc.setDigit(0,4,4, false); // display a "4" in column 4 lc.setDigit(0,3,2, false); // display a "2" in column 3 lc.setRow(0,2,B00000001); lc.setDigit(0,1,3, false); // To display a 3 column 1 lc.setDigit(0,0,6, false); // 6 show a first hand column, column 0 delay(3000); // fac inca un text lc.clearDisplay(0); // To Clear the display register lc.setRow(0,6,B01100010); // "n" lc.setRow(0,5,B00100000); // "i" lc.setRow(0,4,B01110011); // "q" lc.setRow(0,3,B00000001); lc.setRow(0,2,B01000010); // "r" lc.setRow(0,1,B01100011); // "o" delay(3000); // Delay 3 Seconds } |
Downloads
Download Schematic Diagram | Image
Download LedControl.h Code Library | GetHub | Zip
Download MAX72XX Datasheet | PDF
