ESP32 Forum

You should set Data Terminal Ready (DTR) parameter for port to false\disabled. Without that signal, Arduino will not reset each time the port is opened or closed.

SerialPort p = new SerialPort(args[1], 9600);
p.DtrEnable = false;
p.Open();
p.Write(args[0]);
p.Close();

der_Phil wrote:Hi experts,

I use a ESP Wroom 32 on a ESP32 Feather Board
see: https://www.adafruit.com/product/3707

With this, I managed to rebuild this project: https://learn.adafruit.com/thermal-came ... y/overview
I somehow want to extend the project, by saving images on aSD card and transfer them over the USB connector...hence I establish a serial connection using a com port.

My question is a follows.

Using the Arduino IDE I can open/close the com port as expected.

When I open/close the com port with 3rd party software, the board resets...why?

I found this in the internet for an Arduino:
https://tushev.org/articles/arduino/22/ ... ens-closes

You should set Data Terminal Ready (DTR) parameter for port to false\disabled. Without that signal, Arduino will not reset each time the port is opened or closed.

Code: Select all

SerialPort p = new SerialPort(args[1], 9600);
p.DtrEnable = false;
p.Open();
p.Write(args[0]);
p.Close();

Is this also a possible solution for the ESP board?

Thank you,
Phil