If you've considered making a web config portal, with its own wifi hotspot where the user can connect from a computer or mobile, then I'd suggest using LittleFS or similar to host the web pages (HTML) as "files" on the device, which you then can simply upload (the /data directory) through a plugin i...

You only pass those three variables to the scd4x.readMeasurement method such that the library can fill the measurement values into them. This is passing by reference, which is a common alternative to having to return an "object" (a struct?) containing the three values. So, you call the method with t...

I'm a bit confused on some things with your post :) What is `now()` in the ESP code? The ESP doesn't have a wall/real time clock. As far as I know, you can only get the milliseconds elapsed since boot time. It would be helpful to see some more code; I also don't know what the `setTime` function is, ...

You could set up a POST endpoint in your web server (in your C code) which would accept a payload, i.e. your timestamp. Your HTML file would then call this endpoint (from Javascript) using for example an XMLHttpRequest. https://techtutorialsx.com/2017/03/26/esp8266-webserver-accessing-the-body-of-a-...

The pins I've tried to use, are RX/TX also marked "UART0" in the pinout image. Maybe I should use UART1 (or even UART2), as described here: https://www.luisllamas.es/en/esp32-uart/ ?? Just to emphasize: The aim here is to be able to do any serial comms (preferrably, hardware serial over "soft"/virtu...

I'm unable to use the RX and TX pins on my Wemos D1 Mini (marked "MIN132") dev board for serial communications with a PC. I've configured standard hardware serial communications in the sketch, as shown below, which works perfectly if I connect the Wemos to the PC via the USB plug. However, I can't u...

I guess this sort of changes the whole topic of the post. Seems I am indeed calling setup when waking up, but the problem is the criterion for actually waking the esp

Thanks for your response :) I had another look at my code, and one thing it seems I am missing is the command to actually set the ESP to deep sleep? I take it, `esp_sleep_enable_ext1_wakeup` needs to be followed by `esp_deep_sleep_start()` :) In any case, my problem is that I want the ESP to wake on...

Hi! I've been experimenting with ESP8266 for a while, and have just got started looking into ESP32 :) I have an ESP-WROOM-32 WEMOS D1 MINI board. My aim is to set it to sleep (in setup), and then have it wake up whenever either of two GPIO pins change state (high->low, or low->high). After some rese...

Well, in my case, I use the RX pin as a third GPIO (the ESP-1 is a very small breakout). Point is, I can still use TX pin to transmit serial at the same time