A Touch of Innovation: ESP32's Touch Interrupt!

[@andrea-mazzilli]

your videos are very explanatory and clear! good job and keep going! we need more

[@programmingelectronics]

Thanks! Will do!

[@pjforde1978]

This is a great video, but I was sincerely hoping that you'd address how to use Touch14 for active shielding. It's the most under-documented aspect of this whole ESP32 capacitive touch landscape. (See page 23 of the ESP32-S3 hardware design guidelines, section 3.12)

[@robertrobert5583]

Not on topic, but not sure where else to ask! I see references to struct in sketches (eg esp_now) and I wonder what they are and how they differ from classes. I've tried to Google and asked chatgpt but find the explanations rather technical. If you could cover this in a future video that would be great. Thanks for all your superb videos.

[@programmingelectronics]

Thanks Robert! structs essentially help you organize and collect variables into a single "entity" They "sound" sort of technical, but are in usage superduper easy and fun to implement. Not sure if you're a PEA academy member or not, but in our pointers course we talk about using structs, and passing them to functions. I'll see if I can get something out about them on KZbin. All the best!

[@TheEngadine]

🤔 I guess it could be used in those lamps with a long metallic stem whose luminosity can be rosen or diminished just by touching the stem continously or by little spaced touches. No?.

[@programmingelectronics]

Definitely!

[@learninglad9032]

This interrupt is for touch. Is there one for release?

[@mortimersnead5821]

Could this be used to make a theremin?

[@robertherzog2087]

Your demo implies the touch pin suffers from a bounce effect like a button. Would you use the same debounce routine as you would a button? I frequently use a Schmitt trigger for this. Would a Schmitt trigger function in the same way for both?

[@TheSelfUnemployed]

i use something like this to debounce the button press: volatile bool touchDetected = false; volatile unsigned long lastTouchTime = 0; const unsigned long debounceDelay = 50; // Adjust as needed void handleTouch() { unsigned long currentMillis = millis(); // Check if it's been enough time since the last touch if (currentMillis - lastTouchTime >= debounceDelay) { // Record the time of this touch lastTouchTime = currentMillis; // Set the flag to indicate a valid touch touchDetected = true; } }

[@robertherzog2087]

I thought the use of millis() was not valid in an ISR routine.