MQTT in Node RED: Building a Dashboard and Logging Data

[@katosembatya8353]

Precise explanations. Thank you

[@tutturuu.3131]

Thanks for the informative video, it helps me greatly with my project. :D

[@HighVoltages]

Glad it helped!

[@alexis-cg5pl]

Gracias, fue de gran ayuda para configurar mis funciones 👍🏼

[@DavidBarnwell876tkdja]

Hiw did you set up the MQTT broker? You haven't said. Is there a link that explains this?

[@timgraber215]

Look for Eclipse Mosquitto. Can run on Windows as a service. Go through a couple of how-to's via RUclips. You should be able to have it running and accepting data in about 30 minutes. I am using Arduino Nano IoT 33's to send data to this broker. MQTT Explorer can be used to see the available data also, but this tutorial is the finishing touch.

[@599mighty6]

What is causing the LED to blink on and off in this code?

[@djameltalbi2190]

Perfect

[@DavidBarnwell876tkdja]

How do you set up an MQTT broker on windows?

[@HighVoltages]

We did not set up the MQTT broker on Windows but we used the hivemq MQTT broker. From windows , using node-red we are just subscribing and publishing data. Please check previous videos, in which we have used hivemq MQTT broker.

[@DavidBarnwell876tkdja]

OK, I figured it out thanks. But in your code you give a client ID. Is that an ID you created or was it autogenerated? If it was autogenerated, where did you find it?@@HighVoltages

[@HighVoltages]

You can write anything in the client id but each device should have a unique client id.

[@med_boukhatem]

@@DavidBarnwell876tkdja how you did it please ??

[@latata1215]

why on my node-red website Cannot GET /ui/

[@khangthai4216]

thanks u

[@HighVoltages]

Welcome

[@chamodajayamini6454]

Sir can I run two stepper motors simultaneously and obatin data through nodered?

[@malekachour6294]

what is the funcyion between mqtt and neopixel!!

[@HighVoltages]

In this video, neopixel is connected to the ESP32 and ESP32 is connected to the Node-red using MQTT protocol and (MQTT+node red) is allowing us to control the neopixel led.

[@deannevilla]

Garcia Brenda Rodriguez Brian Robinson Kevin

[@najmiarf]

I got this error:
In file included from sketch.ino:5:
/libraries/ServoESP32/src/Servo.h:68:54: error: 'SOC_LEDC_TIMER_BIT_WIDE_NUM' was not declared in this scope; did you mean 'SOC_LEDC_TIMER_BIT_WIDTH'?
68 | static const int TIMER_RESOLUTION = std::min(16, SOC_LEDC_TIMER_BIT_WIDE_NUM);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
| SOC_LEDC_TIMER_BIT_WIDTH
/libraries/ServoESP32/src/Servo.h: In member function 'bool ServoTemplate::attach(int, int, T, T, int, int, int)':
/libraries/ServoESP32/src/Servo.h:148:9: error: there are no arguments to 'ledcSetup' that depend on a template parameter, so a declaration of 'ledcSetup' must be available [-fpermissive]
148 | ledcSetup(_channel, frequency, TIMER_RESOLUTION);
| ^~~~~~~~~
/libraries/ServoESP32/src/Servo.h:148:9: note: (if you use '-fpermissive', G++ will accept your code, but allowing the use of an undeclared name is deprecated)
/libraries/ServoESP32/src/Servo.h:149:9: error: there are no arguments to 'ledcAttachPin' that depend on a template parameter, so a declaration of 'ledcAttachPin' must be available [-fpermissive]
149 | ledcAttachPin(_pin, _channel);
| ^~~~~~~~~~~~~
/libraries/ServoESP32/src/Servo.h: In member function 'bool ServoTemplate::detach()':
/libraries/ServoESP32/src/Servo.h:168:9: error: there are no arguments to 'ledcDetachPin' that depend on a template parameter, so a declaration of 'ledcDetachPin' must be available [-fpermissive]
168 | ledcDetachPin(_pin);
| ^~~~~~~~~~~~~
/libraries/ServoESP32/src/Servo.h: In instantiation of 'bool ServoTemplate::attach(int, int, T, T, int, int, int) [with T = int]':
sketch.ino:136:15: required from here
/libraries/ServoESP32/src/Servo.h:148:18: error: 'ledcSetup' was not declared in this scope
148 | ledcSetup(_channel, frequency, TIMER_RESOLUTION);
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/libraries/ServoESP32/src/Servo.h:149:22: error: 'ledcAttachPin' was not declared in this scope; did you mean 'ledcAttach'?
149 | ledcAttachPin(_pin, _channel);
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
| ledcAttach
/libraries/ServoESP32/src/Servo.h: In instantiation of 'bool ServoTemplate::detach() [with T = int]':
/libraries/ServoESP32/src/Servo.h:88:24: required from 'ServoTemplate::~ServoTemplate() [with T = int]'
sketch.ino:21:7: required from here
/libraries/ServoESP32/src/Servo.h:168:22: error: 'ledcDetachPin' was not declared in this scope; did you mean 'ledcDetach'?
168 | ledcDetachPin(_pin);
| ~~~~~~~~~~~~~^~~~~~
| ledcDetach
Multiple libraries were found for "Servo.h"
Used: /libraries/ServoESP32
Not used: /libraries/Servo
Multiple libraries were found for "WiFi.h"
Used: /esp32/hardware/esp32/3.0.7/libraries/WiFi
Not used: /libraries/WiFiEspAT
Not used: /libraries/WiFi
Error during build: exit status 1
What is this error mean?