ESP32 5inch display
I am using an ESP32 5inch display for an application. The application requires communication using MQTT.
When I add PUBSUB library to a working display the MQTT client intermittently disconnects and takes a long time to connect. When I comment out the lcd->begin(); function from the code MQTT works properly.
Can someone help with this problem
/*********
Rui Santos
Complete project details at https://randomnerdtutorials.com
*********/
#include <WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include <Adafruit_BME280.h>
#include <Adafruit_Sensor.h>
#include <Arduino_GFX_Library.h>
/*******************************************************************************
* Screen Driver Configuration
*******************************************************************************/
Arduino_ESP32RGBPanel *bus = new Arduino_ESP32RGBPanel(
GFX_NOT_DEFINED /* CS */, GFX_NOT_DEFINED /* SCK */, GFX_NOT_DEFINED /* SDA */,
40 /* DE */, 41 /* VSYNC */, 39 /* HSYNC */, 0 /* PCLK */,
45 /* R0 */, 48 /* R1 */, 47 /* R2 */, 21 /* R3 */, 14 /* R4 */,
5 /* G0 */, 6 /* G1 */, 7 /* G2 */, 15 /* G3 */, 16 /* G4 */, 4 /* G5 */,
8 /* B0 */, 3 /* B1 */, 46 /* B2 */, 9 /* B3 */, 1 /* B4 */
);
Arduino_RPi_DPI_RGBPanel *lcd = new Arduino_RPi_DPI_RGBPanel(
bus,
800 /* width */, 0 /* hsync_polarity */, 210 /* hsync_front_porch */, 4 /* hsync_pulse_width */, 43 /* hsync_back_porch */,
480 /* height */, 0 /* vsync_polarity */, 22 /* vsync_front_porch */, 4 /* vsync_pulse_width */, 12 /* vsync_back_porch */,
1 /* pclk_active_neg */, 16000000 /* prefer_speed */, true /* auto_flush */);
/*******************************************************************************
* Screen Driver Configuration end
*******************************************************************************/
// Replace the next variables with your SSID/Password combination
const char* ssid = "**";
const char* password = "***";
// Add your MQTT Broker IP address, example:
//const char* mqtt_server = "192.168.1.144";
const char* mqtt_server = "192.168.2.22";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
unsigned long startMillis; //some global variables available anywhere in the program
unsigned long currentMillis;
void setup() {
Serial.begin(115200);
//lcd->begin(); // Init Display
delay(200);
setup_wifi();
client.setBufferSize(512);
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* message, unsigned int length) {
Serial.print("Message length: ");
Serial.print(length);
Serial.print(" Message arrived on topic: ");
Serial.print(topic);
Serial.print(". Message: ");
String messageTemp;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
messageTemp += (char)message[i];
}
Serial.println();
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
startMillis = millis();
if (client.connect("ESP8266Client")) {
Serial.println("connected");
// Subscribe
currentMillis = millis();
Serial.println(currentMillis-startMillis);
client.subscribe("#");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void loop()
{
if (!client.connected()) {
reconnect();
}
client.loop();
delay(50);
}
Comments
Hello Marktecwiz, You can try the method in here https://randomnerdtutorials.com/esp32-mqtt-publish-dht11-dht22-arduino/ . You need to replace #include <PubSubClient.h> with the following two libraries.
GitHub - marvinroger/async-mqtt-client: 📶 An Arduino for ESP8266 asynchronous MQTT client implementation
https://github.com/marvinroger/async-mqtt-clientGitHub - me-no-dev/AsyncTCP: Async TCP Library for ESP32
https://github.com/me-no-dev/AsyncTCPThank you Sun for you quick response.
Can you give me a quick explanation as to why I need the to use the RTOS library?
Sunny
I tried the above and get the same problem.
I used this example
it worked better then the first code I posted which answered my question on why use the RTOS library.
Then I added:
(this comes from the 5 inch display setup code)
Then if I add
at any place in the set up function
1 - mqtt takes a long time to connect
2 - when it does it will disconnect randomly and then take a long time to connect again.
Removing the begin line will allow the mqtt to work properly and robustly
This is the same problem PubSub exhibits
Sun
I changed the frame rate from 16mhz to 8 and mqtt worked - but the display flickered
I found that 12 mhz worked and 14 mhz does not work,
When I first boot up the display it flickers a little then seems to stop or at least is not noticiable.
Even at 16mhz there is some flicker on start up then it "goes away".
Can you comment?
Sun
So the screen is flickering slightly at 12mhz frame rate.
I am going to try to run the MQTT on the second core but I do not have experience in doing that.
Any reference will be apreciated
Mark
I found a post regarding the flicker
Because the voltage value of VCOM 3.3V is not enough. Inputting 3.8V to VCOM can solve this flickering problem.
Re: Flicker
**I removed all the grey and I found a function of mine that was writing to the display very ofte.
Now the 5 inch display does not flicker at all.
**