I think your program is doing exactly what it said:

if ((millis() – lastTime) > timerDelay) {

For the first pass lastTime == 0 and millis( ) is also a very small value. The millis() starts when your program starts so could be a few milliseconds at the very most. I think I would try adding if ((millis() – lastTime) > timerDelay)||(lastTime==0) {.

Alternaively you need to do the action once at the end of your setup( ) routine, That is

void setup( ){
…previous code
action( );
}

void loop( ){
if ((millis() – lastTime) > timerDelay) {
action( ); //where the new function action( ) is all the code that was in this loop
}
}

this sample-code works absolut fine – thanks for that. So what i found is a tricky situation in this code. When i set the loop-delay to 1 Minute (60000) and the code starts for the first time, i see the webpage and the gauges – so far , so good. But i have to wait 1 minute before the “first” sensor-data is shown in the gauges. This is about the following code-snipet in the loop() as follow:

if ((millis() – lastTime) > timerDelay) {

How can i reach the goal that when the system starts and the startpage (index_html) is rendered the first time that sensor valus is shown immediately as the form is loaded in the browser-page? Same situation when refreshing the browser page with e.g. F5. The startpage is loaded immediately but i have to wait for the first loop-running to get actual sensor-values.

Would be nice if you could show a solutions for this “little gap”. I think a normal loop-timing could be between 10 Minutes up to 1 Hour to cover the changes in all sensor-parameters for a normal detection.

Thanks a lot,
Greeting from Manfred

Thank you.
Ivan

Hi.
This works on a local network.
You need to open a tunnel in your router to access it from anywhere.

Alternatively, you can host the readings in a paid server that you can access from anywhere.
Here’s an example: https://randomnerdtutorials.com/visualize-esp32-esp8266-sensor-readings-from-anywhere/
This is another example:
https://randomnerdtutorials.com/cloud-weather-station-esp32-esp8266/

Or, you can also use Firebase (it’s free):
– https://randomnerdtutorials.com/esp32-esp8266-firebase-bme280-rtdb/
– https://randomnerdtutorials.com/esp32-esp8266-firebase-web-app-sensor/

I hope this helps.

Regards,
Sara

Is it possible to use esp32or esp8266 as sse EventListener or client so that it can listen to data sent by website hosted on share webservers

Uauu.
That looks awesome!
Great work 🙂
Regards,
Sara

Hi Sara!

Thanks alot for the pointers in the right direction! I`ve been testing the tutorials over and over again and have something cooked up now. Ment for the green house monitoring, got it all working inlc history logging, graphing is done with RGraph javascript, wifimanager etc. Most of the code ive got out of RNT esp8266 tutorials.

https://imgur.com/a/yoO45FV
https://imgur.com/a/Rxvdmz9

Amazing what one can learn out of the tutorials thanks again to the RNT team!

Hi.
We have these tutorials with web servers with charts:
https://randomnerdtutorials.com/esp32-esp8266-plot-chart-web-server/
https://randomnerdtutorials.com/esp8266-nodemcu-plot-readings-charts-multiple/

If you want to instantly load the last 20 readings, for example, you need to save your readings in a file (using a microSD card or SPIFFS) in JSON format, for example.
Then, when the page loads it would call the file that contains the readings and display them on the charts.
https://randomnerdtutorials.com/esp32-microsd-card-arduino/
https://randomnerdtutorials.com/esp32-vs-code-platformio-spiffs/
https://randomnerdtutorials.com/install-esp32-filesystem-uploader-arduino-ide/

I hope this helps.
Regards,
Sara