Hi, I have in my project an esp8266, three Max7219 8x32 dot matrix displays, a DS18B20 sensor, DS1307 RTC. I divided the clock board into 5 zones for display.
I have a problem with displaying values. For a while everything is fine, but then the image may flicker, and then whole squares begin to glow. Look at the attached image.
What is the problem and how to fix it?
Sounds like, perhaps, a power supply problem.
Please post a schematic. Written descriptions are always more ambiguous than a drawing. Hand drawn, photographed and posted is fine. Include all pin names/numbers, components, their part numbers and/or values and power supplies. Post the specifications of the power supplies. Volts, amps capability?
Post links to component technical data.
How hot is the regulator on the Nodemcu getting? I don't think it will handle 4 matrix displays.
Connect the matrix module power supply directly to the 5V 3A supply, not the 3.3V of the ESP. They need lots of current.
I connected the matrix directly to the 5 V power supply and nothing happened (all the squares start to glow). For me it's a mystery. Why is that?
I measured, the temperature is about 39 C.
Can you show your code?
And by the way, if you need 32x16 or 64x32 matrix, why do you combine it with small 8x8 pieces... Take the DMD led panel...
those matrices consume crazy amount of power, unless you configured them before hand to go on lowest setting, you are going to blow up your regulator
There is no talk about the regulator, even the single 8x8 matrix needs a separate power supply
On the other hand I fed arduino and two 32x16 matrices from USB2.0 (0.5 amp max) and it works fine
Specification, yes, however manufacturer free to make them output more
#define USE_DS1307
// ============= =======================================================
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include <MD_DS1307.h>
#include "Font_Data.h"
#include <microDS18B20.h>
// ============= =======================================================
#include <GyverPortal.h>
#include <EEPROM.h>
#include <ESP8266WiFi.h>
#include <EEManager.h>
#include "Timer.h"
GyverPortal portal;
const char* ssid = ""; //“your_wifi_ssid”
const char* password = ""; //"your_wifi_password"
uint8_t retries=0;
// ============= ========================================================
//#include <NTPClient.h>
#include <WiFiUdp.h>
#include <GyverNTP.h>
const long timeZone = 3;
const long UpdateInterval = 43200;
//WiFiUDP ntpUDP;
//NTPClient timeClient(ntpUDP, "ua.pool.ntp.org", timeZone, UpdateInterval);
GyverNTP ntp(timeZone, UpdateInterval);
// ================================================================
MicroDS18B20<0> sensor; // ESP8266 D3/0 // Arduino Nano D2/2
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW //ICSTATION_HW
#define MAX_ZONES 3 //
#define ZONE_SIZE 4 //
#define MAX_DEVICES (MAX_ZONES * ZONE_SIZE)
#define ZONE_UPPER 1 //
#define ZONE_LOWER 0 //
#define CLK_PIN 14 //
#define DATA_PIN 13 //
#define CS_PIN 15 //
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// Global variables
char szTimeL[9]; // hh:mm\0
char szTempC[9];
char szTempP[2];
char szTempS[2];
//======================================
uint8_t brDisp = 0;
uint8_t dsTimeH1 = 23;
uint8_t dsTimeH2 = 4;
uint8_t brTimeH1 = 5;
uint8_t brTimeH2 = 8;
uint8_t brTimeH3 = 20;
//======================================
/*GPtime valTime = {
(uint16_t)21, (uint8_t)28,(uint8_t)0
};
*/
GPtime valTime1 = {
(uint16_t)21, (uint8_t)28
};
GPtime valTime2 = {
(uint16_t)22, (uint8_t)14
};
//======================================
void getTime(char *psz, bool f = true)
{
RTC.readTime();
sprintf(psz, "%02d%c%02d", RTC.h, (f ? ':' : ' '), RTC.m);
}
void getTemperature(char *psz)
{
float temperature = 0;
int t = 0;
if (sensor.readTemp()) temperature = sensor.getTemp();
else Serial.println("error");
sensor.requestTemp();
t = (abs(temperature) - (byte)abs(temperature)+0.01)*10;
if (temperature > 0 ) {
sprintf(szTempP, "+");
}
else {
sprintf(szTempP, "-");
}
sprintf(szTempS, "%1d", t);
sprintf(psz, "%2d%c", (byte)abs(temperature), '.');
}
void getDisplayShutdown2()
{
RTC.readTime();
if (dsTimeH2 >= dsTimeH1) {
if (RTC.h >= dsTimeH1 && RTC.h <= dsTimeH2) {
P.displayShutdown(true);
}
else {
P.displayShutdown(false);
}
}
else {
if (RTC.h >= dsTimeH2 && RTC.h <= dsTimeH1) {
P.displayShutdown(false);
}
else {
P.displayShutdown(true);
}
}
}
void getDisplayBright()
{
RTC.readTime();
if (RTC.h >= brTimeH1 && RTC.h < brTimeH2) {
brDisp = 1;
}
else if (RTC.h >= brTimeH2 && RTC.h < brTimeH3) {
brDisp = 15;
}
else {
brDisp = 0;
}
}
void action() {
if (portal.form()) {
if (portal.form("/save")) {
brDisp = portal.getInt("br");
valTime1 = portal.getTime("time1");
valTime2 = portal.getTime("time2");
Serial.print(brDisp);
Serial.print(',');
Serial.print(encodeTime(valTime1));
Serial.print(',');
Serial.print(encodeTime(valTime2));
}
}
}
void timeUpdate()
{
//timeClient.update();
if (ntp.tick() && ntp.synced()&& ntp.status()==0)
{
//RTC.adjust(DateTime(ntp.year(), ntp.month(), ntp.day(), ntp.hour(), ntp.minute(), ntp.second()));
RTC.yyyy = ntp.year();
RTC.mm = ntp.month();
RTC.dd = ntp.day();
RTC.h = ntp.hour();
RTC.m = ntp.minute();
RTC.s = ntp.second();
RTC.writeTime();
Serial.println(ntp.timeString());
Serial.println(ntp.dateString());
}
}
void setup()
{
P.begin(5);
// Serial.begin(9600);
//setupWeb();
//============================================================================
//Start the serial communication with the computer
Serial.begin(115200);
delay(100);
Serial.println();
//Try and Connect to the Network
WiFi.begin(ssid,password);
Serial.print("Connecting to ");
Serial.print(ssid);
Serial.println("...");
//Wait for WiFi to connect for a maximum timeout of 20 seconds
while(WiFi.status()!=WL_CONNECTED && retries<20)
{
Serial.print(".");
retries++;
delay(1000);
}
Serial.println();
//Inform the user whether the timeout has occured, or the ESP8266 is connected to the internet
if(retries==20)//Timeout has occured
{
Serial.print("Unable to Connect to ");
Serial.println(ssid);
}
if(WiFi.status()==WL_CONNECTED)//WiFi has succesfully Connected
{
Serial.print("Successfully connected to ");
Serial.println(ssid);
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());
}
//============================================================================
ntp.begin();
//============================================================================
portal.attachBuild(build);
portal.attach(action);
portal.start();
P.setZone(0, 0, 3);
P.setZone(1, 4, 6);
P.setZone(2, 7, 7);
P.setZone(3, 8, 8);
P.setZone(4, 9, 11);
P.setFont(0, clockFont3);
P.setFont(1, BigFontLower);
P.setFont(2, clockFont2);
P.setFont(3, clockFont2);
P.setFont(4, BigFontUpper);
P.setCharSpacing(P.getCharSpacing()*1);
P.setZoneEffect(1, true, PA_FLIP_UD);
P.setZoneEffect(1, true, PA_FLIP_LR);
P.setZoneEffect(2, true, PA_FLIP_UD);
P.setZoneEffect(2, true, PA_FLIP_LR);
P.displayZoneText(0, szTimeL, PA_CENTER, 75, 0, PA_PRINT, PA_NO_EFFECT);
P.displayZoneText(1, szTempC, PA_LEFT, 75, 0, PA_PRINT, PA_NO_EFFECT);
P.displayZoneText(2, szTempS, PA_CENTER, 75, 0, PA_PRINT, PA_NO_EFFECT);
P.displayZoneText(3, szTempP, PA_CENTER, 75, 0, PA_PRINT, PA_NO_EFFECT);
P.displayZoneText(4, szTempC, PA_RIGHT, 75, 0, PA_PRINT, PA_NO_EFFECT);
RTC.control(DS1307_CLOCK_HALT, DS1307_OFF);
RTC.control(DS1307_12H, DS1307_OFF);
getTime(szTimeL);
}
void loop()
{
static uint32_t lastTime = 0; // millis() memory
static bool flasher = false; // seconds passing flasher
P.displayAnimate();
P.setIntensity(brDisp);
portal.tick();
timeUpdate();
if (P.getZoneStatus(0) && P.getZoneStatus(1) && P.getZoneStatus(2) && P.getZoneStatus(3) && P.getZoneStatus(4))
{
// Adjust the time string if we have to. It will be adjusted
// every second at least for the flashing colon separator.
if (millis() - lastTime >= 1000)
{
lastTime = millis();
getTemperature(szTempC);
getTime(szTimeL, flasher);
getDisplayShutdown2();
getDisplayBright();
flasher = !flasher;
P.displayReset();
// synchronise the start
P.synchZoneStart();
}
}
}
Do you know how to properly power the matrix from a separate power source?
Use DC 5v power supply with approximately 0.3 - 1 A for each 8x8 piece . Connect +5v to VCC on the matrix board and GND to GND on the matrix and GND of your arduino
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