H5 Emergency stop and ESP32 programming

[demsarmatjaz]

Hi Maxim,
I have two questions. The first relates to the emergency stop; is there any other way to get out of an emergency stop than resetting ESP32? I know that that could be dangerous in some situations, but, for example, pressing a defined key on the keyboard for 5 seconds sounds okay to me.
The second one is about programming ESP32. Yesterday I received PCBs so I soldered ESP32, two dip chips, and all the connectors and put everything together on my desk. While playing with encoders and pulse wheels I decided to change pulse wheels properties in the code and found out that I can't program ESP until LCD is connected so I disconnected the 4-pin LCD header and transferred the code to the ESP. Probably RX and TX lines interfere with the UART port or am I doing wrong something? Some days ago I struggled with the G-Code sender, it couldn't get connected to ESP, I suppose that for the same reason.
BR, Matjaz D.

[kachurovskiy]

Hi @demsarmatjaz,

is there any other way to get out of an emergency stop than resetting ESP32?

No, device needs to be power-cycled. Threads in the code end when emergency condition is reached and can not be easily restarted.

can't program ESP until LCD is connected

I assume you meant "until LCD is disconnected". Strange, I'm able to program ESP both when display is working and when it's not (due to insufficient power provided by just the USB cable). Not sure why there would be such a discrepancy between our setups.

struggled with the G-Code sender

Yes, I had trouble with it as well, going forward we'll probably switch to WiFi for this.

[demsarmatjaz]

Hi, thanks for the fast response. Ok, all clear about the emergency stop.
No, I meant while the LCD is connected. There may be some difference between your LCD and mine although I think there shouldn't be. I am using NX4830T032 at this moment and it is working great. Are you disconnecting external 5V DC and just power ESP from PC while uploading the code? That could make sense, I didn't disconnect 5V power, so LCD was alive all the time.

[kachurovskiy]

I was just able to upload while everything was plugged in:

[demsarmatjaz]

Hi, I believe you. I just tried again and can confirm that the upload can be done if I unplug the 5VDC power supply from the wall socket. In this case the LCD stays black because the +5V pin on the LCD header is powered from an external source, not from the ESP. Apparently, there is some difference between these two Nextion LCDs. It's not a big deal, so it's not worth wasting your time. It's just good to know that I have to unplug the power while uploading the code.

One more question, would ESP32S3 be able to handle 1800p/r encoder at 2000rpm using 2x resolution as it does in the code you provided? I would like to get 0,1 degree angle resolution but I would also like to stay at the code with as less as possible changes. Would it be better to use 900 p/r at 4x mode?

BR, Matjaz D.

[kachurovskiy]

ESP32S3 be able to handle 1800p/r encoder at 2000rpm using 2x resolution

There's no practical limit. There's a theoretical limit of 40 Mhz for ESP32-S3 pulse counter (https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf#pcnt) and 2000/60*1800 = 60k < 40M.

[demsarmatjaz]

Ok, thanks.