Albert Einstein He developed the general theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).

The first integrated circuit invented by the engeneer Jack S. Kilby1 (1923-2005) contained only a few transistors. Texas Instruments.

7 segment module and Arduino

Download the .zip file below. Unzip it and open it in Arduino IDE. Compile and upload.

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#define MAX7219_Data_IN 2
#define MAX7219_Chip_Select  3
#define MAX7219_Clock 4

//The shift function
void shift(byte send_to_address, byte send_this_data)
  digitalWrite(MAX7219_Chip_Select, LOW);
  shiftOut(MAX7219_Data_IN, MAX7219_Clock, MSBFIRST, send_to_address);
  shiftOut(MAX7219_Data_IN, MAX7219_Clock, MSBFIRST, send_this_data);
  digitalWrite(MAX7219_Chip_Select, HIGH);

void setup() {
  //Define the pins as outputs and disable CS
  pinMode(MAX7219_Data_IN, OUTPUT);
  pinMode(MAX7219_Chip_Select, OUTPUT);
  pinMode(MAX7219_Clock, OUTPUT);
  digitalWrite(MAX7219_Chip_Select, HIGH);
  shift(0x0f, 0x00); //display test register - test mode off
  shift(0x0c, 0x01); //shutdown register - normal operation
  shift(0x0b, 0x07); //scan limit register - display digits 0 - 7
  shift(0x0a, 0x0f); //intensity register - max brightness
  shift(0x09, 0xff); //decode mode register - CodeB decode all digits

void loop() {  
  //Data transfer
  shift(0x01, 0x0f);
  shift(0x02, 0x00);//O
  shift(0x03, 0x0D);//L
  shift(0x04, 0x0D);//L
  shift(0x05, 0x0B);//E
  shift(0x06, 0x0C);//H
  shift(0x07, 0x0f); 
  shift(0x08, 0x0f); 

arduino 7 segments schematic module