Tag Archives: MAX7219


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

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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


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Weekend offer: 30% OFF on 8-digit (double row) SPI 7-segment LED displays

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We are offering 30% OFF (coupon code BDEA254) on SPI7SEGDISP8.56-2R this weekend (May 31 – Jun 2, 2012). SPI7SEGDISP8.56-2R is a MAX7219-based seven segment LED display board with 8-digits which are arranged in two rows of four. The MAX7219 allows you full control of all the digits and decimal points through three I/O pins of a microcontroller. The communication interface is SPI-compatible, and the brightness of the LED segments can be controlled through software.

SPI7SEGDISP8.56-2R: MAX719-based seven segment LED display module


Key Features:

  • 3-wire SPI interface
  • double row of 4-digit displays (0.56″)
  • operates at +5V supply
  • individual control of all digits and decimal points
  • 16 levels of display brightness through software
  • PCB dimensions 2.8″ x 1.7″ (70mm x 42mm)
  • Two or more of these modules can be cascaded in series

Since it requires only 3 I/O pins, this display module can also be used with low pin-count microcontrollers (such as PIC12F series). Visit my MAX7219 tutorial page for more detail on MAX7219 and PIC12F683 interfacing example. With Arduino, it can be easily interfaced using the LedControl library.

It is available in three LED colors: Red, Blue, and Yellow. The buying links are provided at the end.

SPI7SEGDISP8.56-2R (Red)

SPI7SEGDISP8.56-2R (Blue)

SPI7SEGDISP8.56-2R (Yellow)

Tindie buying links:

SPI7SEGDISP8.56 buying link – Red color

SPI7SEGDISP8.56 buying link – Yellow color

SPI7SEGDISP8.56 buying link – Blue color

Use a coupon code BDEA254 to get 30% OFF, which is valid from May 31 – Jun 2, 2012.

MAX7219-based double row 4-digit seven segment LED display

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This display board (SPI7SEGDISP8.56-2R) features eight 7-segment displays arranged in two rows of four digits. The on-board MAX7219 driver enables you to control all LED segments through only 3 I/O pins of microcontroller. The major advantage of using this board is the time-division multiplexing operations required for continuous refreshing of the display digits are performed by the MAX7219 chip, thereby keeping the microcontroller free for doing other pressing tasks. The double row arrangement is suitable for many projects where two variable values are to be displayed simultaneously, such as displaying temperature and humidity, or current and voltage, etc.

SPI7SEGDISP8.56-2R: MAX719-based seven segment LED display module

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TrH Meter kits are back in stock at Tindie

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TrH Meter is a DIY digital room thermometer plus hygrometer that displays temperature and relative humidity on 4 large (1 inch) seven segment LED displays which adjust their brightness level according to the surrounding illumination. It consists of a closed loop system that continuously assesses ambient light condition using an inexpensive light-dependent resistor (LDR) and uses that information to adjust the brightness of the display. An inexpensive DHT11 sensor is used to measure temperature and relative humidity. You can buy a complete TrH Meter kit with a preprogrammed PIC microcontroller  for $26.00.

Displaying temperature in degree F

Temperature display in degree C

Humidity is displayed in percentage (P)

Tindie buying link for TrH Meter kit.

SPI7SEGDISP8.56 kit is now available with blue seven segment LED displays

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SPI7SEGDISP8.56 is a MAX7219 based serial seven segment LED display module that allows you to add 8 digits of seven segment LED displays to your project using only 3 I/O pins, and provides full control of all the digit segments including decimal points. The LED display size is 0.56″ and all 8 digits are arranged into two rows of four. SPI7SEGDISP8.56 display kit is now also available with blue LED color. You can buy one for $13.50 on Tindie.

SPI7SEGDISP8.56-1R module in blue color

SPI7SEgDISP8.56-1R Buying links:

SPI7SEGDISP8.56 buying link – Red color
SPI7SEGDISP8.56 buying link – Yellow color
SPI7SEGDISP8.56 buying link – Green color
SPI7SEGDISP8.56 buying link – Blue color

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