Communicate with Arduino via DIP MAX232

Other Hardware General Electronics
1

The Code that I am going to attach below is uploaded on the Arduino and this Arduino is connected via a DIP MAX232 following the scheme that i will provide as well to the USB of my Laptop. I am using Termite to communicate with the Arduino. The problem here is that I do not manage to do communicate with it. I dont get any answers or anything is shown on the Termite screen. The Tx led blinks and before I of course have tested the code in the arduino IDE. Now the arduino IDE is closed though. It shouldnt interfere.

The settings in Termite are:

  • Baudrate: 9600
  • Databits: 8
  • Stopbits: 1
  • Parity: none
  • Flow control: none
  • Forward: none
  • Transmitted text: Append CR-LF

The scheme is from the following website (I cannot put pictures up yet as I am Newbie):
https://www.e-hack.de/max232-spannungspegelwandler-funktion-und-schaltung/

The condenstaors all have 10 micro F.
And here my code:


void setup() {
  Serial.begin(9600); 
}

void loop() {
  Serial.println("Hallo, bitte antworten!");

  while (Serial.available() == 0) {
  }

  String antwort = Serial.readStringUntil('\n');

  Serial.print("Empfangene Antwort: ");
  Serial.println(antwort);

  delay(1000);
}

If you need any more information or if I forgot to provide some tell me. Thank you for your help

2

image
image987×786 91.4 KB

3

What type of Arduino are you using?
Do you have a 9 pin serial socket (or a USB to 9 pin rs232 adaptor) on your PC?

4

I currently am not in the laboratory because of a meeting but it should be an arduino uno wifi. And I am using a usb to rs232 Digitus (this shouold be it) adapter

5

There are several of them

  • Uno WiFi
  • Uno WiFi Rev 2
  • Uno R4 WiFi

Which one?

6

Okay, just asked. It says Arduino UNO SMD on it.

DSCN1582
DSCN15821920×1440 297 KB

(Tried uploading it via the button and it worked this time. The last time when I tried to drag and drop a pdf it said "As a newbie you are not allowed to add attachents". Does anyone know why?)

7

That looks like an original SMD Uno, not one of the WiFi variants.

As a newbie you can't attach; but as you figured out (:+1:) you can drag and drop images. Most of us are not too crazy about attachments; it's so much easier to look at a schematic in a post. A valid exception on that "rule" is a datasheets or a user manuals.