Arduino : Potentio Indicator Uses Led Matrix MAX7219

In the previous tutorial I've made a potentiometer indication using the RGB ring neo pixels led. you can see it in this article "Potentio Indicator Uses RGB Neopixel"

And today I will show the potentiator indicator using the MAX7219 led metric display.

Follow the steps below to make it.

Required Components :

• Arduino nano
• Potentiometer
• Max7219 Led Matrix Display
• Jumper Wire
• Project Board
• USB mini
• laptop

Required Library

• LedControl

To assemble the components see the schematic drawing above, you can also see the information below:

Arduino to Led & potentio

+5V ==> VCC & 3.Potentio

GND ==> GND & 1.Potentio

D6 ==> DataIn

D7 ==> CLK

D8 ==> CS / Load

Use the code below to make ait:

#include "LedControl.h"
/*
 Now we need a LedControl to work with.
 ***** These pin numbers will probably not work with your hardware *****
 pin 6 is connected to the DataIn 
 pin 7 is connected to the CLK 
 pin 8 is connected to LOAD 
 We have only a single MAX72XX.
 */
 LedControl lc=LedControl(6,7,8,1);
 unsigned long delaytime=100;
 void setup() {
   lc.shutdown(0,false);
   lc.setIntensity(0,8);
   lc.clearDisplay(0);
}
void loop() 
{
   int val = analogRead(A0);
   val = map(val, 0, 1023, 0, 8);
  if(val == 1)
  {
    lc.setRow(0,0,B10000000);
 
  }
  if(val == 2)
  {
     
     lc.setRow(0,0,B10000000);
     lc.setRow(0,1,B10000000);
  }
  if(val == 3)
  {
     lc.setRow(0,0,B10000000);
     lc.setRow(0,1,B10000000);
     lc.setRow(0,2,B10000000);
  }
  if(val == 4)
  {
      lc.setRow(0,0,B10000000);
      lc.setRow(0,1,B10000000);
      lc.setRow(0,2,B10000000);
      lc.setRow(0,3,B10000000);
  }
  if(val == 5)
  {
      lc.setRow(0,0,B10000000);
      lc.setRow(0,1,B10000000);
      lc.setRow(0,2,B10000000);
      lc.setRow(0,3,B10000000);
      lc.setRow(0,4,B10000000);
  }
  if(val == 6)
  {
      lc.setRow(0,0,B10000000);
      lc.setRow(0,1,B10000000);
      lc.setRow(0,2,B10000000);
      lc.setRow(0,3,B10000000);
      lc.setRow(0,4,B10000000);
      lc.setRow(0,5,B10000000);
    
  }
  if(val == 7)
  {
          lc.setRow(0,0,B10000000);
        lc.setRow(0,1,B10000000);
      lc.setRow(0,2,B10000000);
      lc.setRow(0,3,B10000000);
      lc.setRow(0,4,B10000000);
      lc.setRow(0,5,B10000000);
      lc.setRow(0,6,B10000000);
  }
  if(val == 8)
  {
          lc.setRow(0,0,B10000000);
     lc.setRow(0,1,B10000000);
      lc.setRow(0,2,B10000000);
      lc.setRow(0,3,B10000000);
      lc.setRow(0,4,B10000000);
      lc.setRow(0,5,B10000000);
      lc.setRow(0,6,B10000000);
      lc.setRow(0,7,B10000000);
  }
  lc.clearDisplay(0);
}

Once programmed, the results will look like this.

If the potentio is rotated to the right, the live LEDs will increasingly follow the number of turns.

If the pot is turned to the left, the live LED will be less and less following the rotation potency.