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//-----------дисплей-----------
#include <TM74HC595Display.h>
int SCLK = 7;
int RCLK = 6;
int DIO = 5;
TM74HC595Display disp(SCLK, RCLK, DIO);
unsigned char LED_0F[29];

//--------дисплей-------

#define PIN_D2 2 // Установка контакта используемого в Arduino
volatile unsigned int pulses;
float rpm;
unsigned long timeOld;
#define HOLES_DISC 1

void counter()
{
pulses++;
}

void setup()
{
//для дисплея цифры
LED_0F[0] = 0xC0; //0
LED_0F[1] = 0xF9; //1
LED_0F[2] = 0xA4; //2
LED_0F[3] = 0xB0; //3
LED_0F[4] = 0x99; //4
LED_0F[5] = 0x92; //5
LED_0F[6] = 0x82; //6
LED_0F[7] = 0xF8; //7
LED_0F[8] = 0x80; //8
LED_0F[9] = 0x90; //9
Serial.begin(9600);
pinMode(PIN_D2, INPUT);
pinMode(3, OUTPUT); //3 пин как выход
digitalWrite(3, HIGH); //подать 5 вольт на 3 пин
pulses = 0;
timeOld = 0;
attachInterrupt(digitalPinToInterrupt(PIN_D2), counter, FALLING);
}

void loop()
{
if (millis() - timeOld >= 1000)
{
detachInterrupt(digitalPinToInterrupt(PIN_D2));
rpm = (pulses * 60) / (HOLES_DISC);
Serial.println(rpm);
timeOld = millis();
pulses = 0;
attachInterrupt(digitalPinToInterrupt(PIN_D2), counter, FALLING);
}
disp.digit4(rpm,50); //вывод на дисплей
}