How to Add Outputs to an Arduino Using a Shift Register -- The Learning Circuit 77

Matt — Wed, 20 May 2020 07:24:00 GMT

Current Revision posted to Documents by Matt on 5/20/2020 7:24:00 AM

How to Add Outputs to an Arduino Using a Shift Register

The Learning Circuit | element14 presents | Project Videos

www.youtube.com/watch

Serial In Parallel out (SIPO) shift registers can take data in a single input and transfer it to multiple outputs. This type of shift register can be used to expand the outputs of an Arduino. Watch as Karen shows how to create a circuit that uses only 3 I/O pins of an Arduino to create 8, 16, or more outputs.

int clearPin = 5; //Arduino pin 5 connected to Pin 10, SRCLR(Clear/Reset) of 74HC595
int serialData = 6;  //Arduino pin 6 connected to Pin 14, SER(serial input) of 74HC595
int shiftClock = 7;  //Arduino pin 7 connected to Pin 11, SRCLK(shift clock) of 74HC595
int latchClock = 8;  //Arduino pin 8 connected to Pin 12, RCLK(storage/latch clock) of 74HC595 ]


void setup() {   //runs once at startup
   //set pins to output so you can control the shift register
  pinMode(clearPin, OUTPUT);
  pinMode(shiftClock, OUTPUT);
  pinMode(latchClock, OUTPUT);
  pinMode(serialData, OUTPUT);


  digitalWrite(clearPin, LOW); //Pin is active-low, this clears the shift register
  digitalWrite(clearPin, HIGH); //Clear pin is inactive
}


void loop() {    //runs and loops continuously
    for (int shiftCount = 0; shiftCount < 256;shiftCount++) {  
          // count from 0 to 255 and display the number on the LEDs
   
   digitalWrite(latchClock, LOW);    
          // take the latchClock low so 
          // the LEDs don't change while you're sending in bits:


   shiftOut(serialData, shiftClock, MSBFIRST, shiftCount);      // shift out the bits
   digitalWrite(latchClock, HIGH);     //take the latch pin high so the LEDs will light up
   delay(500);     // pause before next value
   }
}

Bill of Material:

Product Name	Manufacturer	Quantity	Buy KitBuy Kit
Arduino Uno, ATmega328P MCU, 14 3.3V I/O, 6 Analogue Inputs, 6 PWM Outputs	Arduino	1	Buy NowBuy Now
Breadboard, MCM 60 rows, ABS, 8.5mm, 165mm x 56mm	Multicomp	1	Buy NowBuy Now
SN74HC595N -Shift Register, HC Family, 74HC595, Serial to Parallel, 1 Element, 8 bit, DIP, 16 Pins	TEXAS INSTRUMENTS	2	Buy NowBuy Now
Through Hole Resistor, 470 ohm, 500 mW, ± 5%	VISHAY	16	Buy NowBuy Now
Through Hole Resistor, 10 kohm, 250 mW, ± 1%	TE Connectivity	2	Buy NowBuy Now
Red LED, Through Hole, 5mm, 20 mA, 2.1 V	LED TECHNOLOGY	8	Buy NowBuy Now
LED, Green, Through Hole, T-1 3/4 (5mm), 20 mA, 2.1 V, 570 nm	Multicomp Pro	8	Buy NowBuy Now
140 Pc. Jumper Wire Kit, 22 AWG, Solid, Assorted Lengths and Colors	Twin Industries	1	Buy NowBuy Now
Wire Kit, Jumper, Male to Male, Solderless, 100 mm - 250 mm, 75 Piece	MCM	2	Buy NowBuy Now
USB Cable, USB Type A Plug, USB Type B Plug, 915 mm, 36.1 ", USB 2.0, Black	MULTICOMP	1	Buy NowBuy Now

Additional Parts:

Product Name
Computer with Arduino IDE

Attachments:

community.element14.com/.../TLC-77_5F00_Resources.zip

Tags: e14presents_makerkaren, arduino_tutorials, arduino, the learning circuit 77: how to add outputs

The Learning Circuit 77: How to Add Outputs to an Arduino Using a Shift Register

tariq.ahmad — Thu, 24 Sep 2020 16:29:00 GMT

Revision 1 posted to Documents by tariq.ahmad on 9/24/2020 4:29:00 PM