NodeMCU Shift Register on Arduino IDE

This tutorial of Robo India explains how to use Shift Register HC595 on NodeMCU using Arduino IDE.

1. Introduction:

A shift register is used for serial input and converting them to parallel output. In simple language it is used to increase output pins. Because it just used three pins as input and gives 8 ouput pins.

1.1 Hardware required

S.No.	Item	Quantity	Buy on Robo India	Buy on Amazon
1	NodeMCU	1	click here	click here
2	Micro USB Cable	1	click here	click here
3	Shift Register Module by Robo India	1	click here	click here
5	Jumper Male to female	5	click here	click here

 2. Building Circuit

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3. Programming:

Once the circuit part is done, NodeMCU is needed to be programmed. Here is the code to run this circuit on NodeMCU.

You may download this code (Arduino Sketch) from here.

// Robo India Tutorial on Shift Register 74HC595

const int DataPin = 2;              //Data Pin is connected to Pin D4
const int LatchPin = 0;             //Latch Pin is connected to Pin D3 
const int ClockPin = 4;             //Clock Pin is connected to Pin D2


void setup()
{
    pinMode (DataPin, OUTPUT);
    pinMode (ClockPin, OUTPUT);
    pinMode (LatchPin, OUTPUT);
}

void loop()
{
  digitalWrite (LatchPin, LOW); 
  shiftOut(DataPin, ClockPin, LSBFIRST, 255);
  digitalWrite (LatchPin, HIGH);
  delay(1000);
  digitalWrite (LatchPin, LOW); 
  shiftOut(DataPin, ClockPin, LSBFIRST, 0);
  digitalWrite (LatchPin, HIGH);  
  delay(1000);
}

4. Output

All 8 LEDs blink together at an interval of 1 second. Try changing values between 0-255. Convert this values to binary, the binary pattern is shown on LEDs.

5. Troubleshooting

Showing Wrong pattern: Try changing LSBFIRST/HSBFIRST in shiftout command.

If you have any query please write us at support@roboindia.com

Thanks and Regards
Content Development Team 
Robo India
https://roboindia.com