Questions tagged [max7219]
Refers to the MAX7219 chip, a multiplexing LED driver. Use this tag for discussing the MAX7219 chip.
41 questions
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Arduino IDE Doesn't Detect Installed Library Dependency
I am trying to edit an old code for a dot matrix display. This code was written on Arduino IDE in Windows 10, for DOIT ESP32 DEVKIT V1. I never had a problem with libraries in the Windows environment ...
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DHT11's data on MAX7219 reads 0
I want print data from a DHT11 (temperature and humidity) on a MAX7219 LED display but it only shows 0. Serial monitor, on the other hand, shows both humidity and temperature which means that my ...
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dht11 data on ESP32 NTP clock (updated)
I'm trying to get my ESP32 internet clock to show temperature and humidity data from a dht11 sensor on a MAX7219 display but my code seems to have some issues. After verifying the code there are no ...
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How to create 2 individual daisy chains using the MAX7219 Module and Mega2560
I am using MAX7219 8 digit 7 segment displays with Arduino Mega2560. Now, I have to physically space out the displays far from each other. Hence, after a certain distance the displays on the far end ...
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Clarification of power-up behaviour of MAX7219 display driver
What is the exact meaning of the Initial Power-Up Section of the MAX7219 data sheet to be found on Page 7?
It says:
On initial power-up, all control registers are reset, the display is blanked, and ...
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504
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Removing spaces between characters in MD_Parola
I'm using ESP8266 and Max7219 module (8*32) and MD_Parola library. To create my own font, at first I used of MDParolaFontEditor and created the following fonts.
I edited file MD_MAX72xx_font.cpp ...
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633
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Problem with displaying true RMS of the main voltage using Arduino Uno and MAX7219
I want to display the true RMS of the main voltage using an Arduino and a MAX7219. At first, I used of circuit #1 (the following circuit) and the True RMS library. The circuit could successfully ...
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DS3231 Clock project shows right date but wrong day
Heeya Guys!
Today I created a project with the help of instructables site. I followed the on screen steps and everything. Uploaded the sketch and it works like a charm, but there's one problem.
...
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ESP8266 NODEMCU V3 web server with MAX7219 and DS3231 RTC
I am using ESP8266 NodeMCU with MAX7219 and a DS3231 teal time clock. I want to display the time and some text. The display is made of 4 FC16 modules which are made of 4 8x8 MAX7219 led matrix modules ...
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Parola library and DS3231 clock
EDIT2: Well, this is the "new" code and it just displays random dots on the matrices:
#include "RTClib.h"
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
// Define ...
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FC-16 led matrix module based on MAX7219
EDIT:
const char *pc[NUM_ZONES] =
{
"ROOM", //0
"SUBJECT", //1
"GRADE",//2
};
I did this and I can't get them to display every row simultaneously.
void loop(void)
{
DateTime now = rtc....
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Arduino Nano, DS3231 RTC clock module and 4 cascaded FC-16 led matrix modules
Like I said in the title, I am using a DS3231 real time clock module and 4 cascaded FC-16 modules(they are basically MAX7219 led matrices based modules). My goal is to display a timetable, a schedule ...
- 27
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MAX7219 with 8digit 7seg array
I have a concern about the library port handling. I have used direct port direction manipulation successfully in previous projects but there seems to be a problem here.
// This code mostly taken from ...
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Scroll Left to Right on MAX7219 Display
For scrolling from left to right (Arabic letters) I need a function to print words/sentences on the MAX7219 display. [By setpixel(x, y) function]
I did a lot of searching and my efforts failed. I ...
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Daisy chaining of multiple blocs of 4x(8x8) MAX7219 matrix
Thanks for your presentation https://arduino.stackexchange.com/tags/max7219/info.
You say that multiple MAX7219 8x8 blocs can easily be daisy-chained and you show an example of at least 12 blocs ...
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