SPI7SEGDISP4.40-1R LED displays are back in stock

Posted on July 26, 2013 by R-B One comment |

SPI7SEGDISP4.40-1R is a serial 4-digit seven segment LED display based on MAXIM’s MAX7219 device. This display module can be interfaced with any microcontroller that has 3 I/O pins available. If the microcontroller features a built-in hardware SPI, then the display module can be interfaced as a SPI slave device. In that case the SPI signal lines SDO (serial data out), SCLK (serial clock), and SS (slave select) from the microcontroller can be directly connected to the DIN, CLK, and LOAD pins labeled on the display module. CS is active low signal.

In case the host microcontroller doesn’t have a hardware SPI module, the interface can be implemented in software. Click here for an example that illustrates how to write a software SPI routine to drive the display module with three general purpose I/O pins of the PIC12F683 microcontroller.

SPI7SEGDISP4.40-1R LED display module

Features:

based on MAX7219 display driver
SPI interface (3 pins)
operates at +5V supply
individual control of all digits and decimal points
display brightness control through software
dimensions 1.95? x 1.4? (50mm x 36mm)
high quality LTC-4727JS display (0.40″) module that emits bright yellow light
colon segments for displaying time (MM:SS or HH:MM)
fully assembled and tested board

The SPI7SEGDISP4.40-1R module can also be interfaced with an Arduino board using the LedControl library. See an example below.

#include "LedControl.h"
// Arduino Pin 7 to DIN, 6 to Clk, 5 to LOAD, no.of devices is 1
LedControl lc=LedControl(7,6,5,1);
void setup()
{
 // Initialize the MAX7219 device
  lc.shutdown(0,false);   // Enable display
  lc.setIntensity(0,15);  // Set brightness level (0 is min, 15 is max)
  lc.clearDisplay(0);     // Clear display register
}
void loop()
{
  lc.setDigit(0,0,4,true); // Display 4 to Digit 4, and turn DP on
  lc.setDigit(0,1,3,true); // Display 3 to Digit 3, " "
  lc.setDigit(0,2,2,true); // Display 2 to Digit 2, " " 
  lc.setDigit(0,3,1,true); // Display 1 to Digit 1, " "
  lc.setDigit(0,4,3,true); // Turns L1, L2, and L3 on
  delay(1000);
}