Comments on: ESP32 Plot Sensor Readings in Charts (Multiple Series)

By: George

George — Wed, 12 Mar 2025 08:38:57 +0000

Hello! My chart displays the time in AM PM format. Can you tell me how to convert it to 24-hour format?

By: Vlad

Vlad — Sun, 02 Mar 2025 15:01:27 +0000

In reply to Sara Santos.

renderTo:’chart-temperature’ ,
type: ‘spline’

By: Joe S

Joe S — Fri, 10 Jan 2025 04:29:13 +0000

Any way of showing historical data? Instead of only just logging after the user connects to the website. What if we log the sensor data in an array in memory at all times whether the user is viewing the site or not?

By: Andreas Deckers

Andreas Deckers — Sun, 02 Jun 2024 16:26:54 +0000

Hi, I am in trouble flashing the spiffs file despite i followed your guidance in the web site. I am operating Arduino IDE 2.3.2. After mounting the spiffs file i get the message upload successfully but when press the reset button on ESP32 the following error code apears:
18:19:55.436 -> E (4132) SPIFFS: mount failed, -10025
18:19:55.436 -> An error has occurred while mounting SPIFFS
I am running to test the file w/o temperature sensors. Is that my problem? Do you have an Idea, why this application doesn`t work on my ESP32?

By: gipxq01

gipxq01 — Mon, 26 Jun 2023 15:56:30 +0000

I was getting no output on my web page until I realised my fundamental mistake.
I made style.css and script.js in notepad++ and it added a hidden .txt to the end of each file.
Once I fixed this it is running smoothly.
Quick Question, what is the max distance I could have a DS18B20 sensor hard wired to the ESP32 and If I have 4 of them does that change that distance?

By: laskov

laskov — Wed, 23 Nov 2022 09:48:30 +0000

Thank you for the great tutorials!
Please tell me what happens when millis() approaches its maximum value and when it overflows in
void loop() {
if ((millis() – lastTime) > timerDelay) {
// …..
lastTime = millis();
}
}

By: JB

JB — Thu, 20 Oct 2022 08:14:57 +0000

In reply to gaspertom. note the AP ip address in the serial monitor.

By: JB

JB — Thu, 20 Oct 2022 07:31:03 +0000

In reply to gaspertom.

Hi.
Download the data folder and the ino file from here.
then you can run in apmode.

https://drive.google.com/drive/folders/1wEd4xZ7TWrce5oODrdGBoH7UJNJuJ__5

By: laskov

laskov — Wed, 19 Oct 2022 09:48:01 +0000

In reply to gaspertom. Hi, try removing http://

By: gaspertom

gaspertom — Wed, 24 Aug 2022 00:30:42 +0000

In reply to Sara Santos. Has anyone got this to work in local Access Point mode, no internet connection? I have the highcharts.js file on my local ESP8266 SPIFFS directory along with the index.html file. I modified the index.html file to use local source as http://highcharts.js When the program runs, the title appears with no charts. Can anyone help? P.S. The program works fine with internet access and using the highcharts from here. https://code.highcharts.com/highcharts.js