Tag Archives: MAX7219

8 Digit Numerical 7 Segment SPI Display Shield for Arduino UNO

8 Digit serial numerical display shield for Arduino has been designed for various applications like digital clock, stop watch, score display, temperature meter, frequency counter, digital meters etc. The circuit uses popular MAX7219 IC and two common cathode 0.5inch red seven segment displays. The MAX7219 is a compact, serial input/output common-cathode display drivers that interface Arduino UNO to 7-segment numeric LED displays of up to 8 digits. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each digit. Only one external resistor R1 provided to set the segment current for all LEDs. A convenient 3-wire serial interface connects to all Arduino UNO. Individual digits may be addressed and updated without rewriting the entire display. The MAX7219 also allows the user to select code-B decoding or no-decode for each digit. The devices include a 150µA low-power shutdown mode, analog and digital brightness control, a scan-limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on. The project works with 5V DC and SPI interface connected to Arduino Digital pins D4, D5 and D6.

8 Digit Numerical 7 Segment SPI Display Shield for Arduino UNO – [Link]

Arduino 50V digital Voltmeter using MAX7219

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M.Pugazhendi build a digital voltmeter using Arduino and MAX7219 display driver.

The Arduino inbuilt 10 bit ADC, can be used for constructing / measuring the 0Volt to 50Volt Digital Volt Meter. Popular MAX7219 display driver, connected with Arduino Uno will be used for displaying the measured voltage. This voltmeter can read only DC voltage.

Arduino 50V digital Voltmeter using MAX7219 – [Link]

Arduino 8 Digit, 7 Segment BCD Counter using MAX7219

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PugazhM @ instructables.com show us how to make a 7 segment BCD counter using MAX7219 and Arduino.

In Embedded system design, seven segment displays are playing a major role as numerical visual indications. Seven segment LED displays are brighter, more attractive and provide a far viewing distance as well as a wider viewing angle as compared to LCD displays. Its available wide dimensions (0.3 inch to 6 inch) and different colors (RED, GREEN, BLUE, ORANGE, WHITE). It can display digits from 0 to 9 and quite a few characters like A, b, C, d, E, e, F, n, o, P, t, u, etc. This intractable is about interfacing 8 digits of 7 segment display by using popular MAX7219 display driver with Arduino Uno.

Arduino 8 Digit, 7 Segment BCD Counter using MAX7219 – [Link]

Arduino 8×8 LED Matrix using MAX7219

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In this tutorial you will learn how to drive a 8×8 led matrix using MAX7219 display driver IC.

In this instructable I’m going to show you how to Interface with LED matrix using an Arduino and MAX7219 IC, this project can be used to make low resolution images using LEDs. This project is very simple to build and serves as a basics to getting started with controlling a large number of LEDs using the Arduino Uno.

Arduino 8×8 LED Matrix using MAX7219 – [Link]

Large 8×8 LED Matrix Display

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jollifactory @ instructables.com has published a large 8×8 LED Matrix Display which is driven by a MAX7219 and Arduino.

For this project, we will be building a single color large LED matrix display which is made up of a few large 8×8 LED matrix modules daisy-chained together. Each of these 8×8 LED matrix modules is around 144mm x 144mm in size.

Large 8×8 LED Matrix Display – [Link]

IP Time Clock using NTP protocol

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by msuzuki777 @ www.instructables.com

So this Lazy Old Geek (LOG) has a couple of clocks in my bedroom. One of them loses time when the power is lost. The other is semi smart and automatically adjusts for Daylight Savings Time. Unfortunately, it does this using the old standard so I have to re-set the time four times a year. Well, I’m LAZY so I decided to make my own Clock. At first I was thinking Atomic clock as I have three in my living room (I’m a GEEK, remember?).

IP Time Clock using NTP protocol – [Link]