LED blink on MAX3232 - Arduino Nano ESP

Projects General Guidance
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Hi all,

i have a rather weird issue : on a breadboard i have connected a MAX3223 TTL-RS232 converter to test my setup. On the TTL lines, i have added a 2.2K resistor and a LED . The long wire from the LED goes the 3.3v , the short goes to the resistor.

Now, the goal is to see if there is any serial communication on those lines. If there is, the LED should light up. But it didn't. Then i wanted to check if there really was comming serial data trough those lines , so i added a USB to serial converter , connected the Tx to Rx and visa versa, and the GND and Vcc to the breadboard. When i connect the small converter with USB to my pc , my initial LED starts to blink, and indeed there was data comming out of the serial port of the ESP32.

Why is this? Did i not have enough power ? I tried the ESP on USB power , and also on up to 12V on the VIN pin. nothing.

I just can't tell , why? When i disconnect the USB to Serial converter from the USB port, the LED stops blinking.

I checked my wires like a dozen times, it all seems ok.

4

Words can sometimes be confusing when explaining a project.
How about posting a wiring diagram of your project and also the code you are using for testing.
That way you would help us help you.

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