Serial monitor failing to update after serial communication

Official Hardware Nano Family Classic Nano
1

I've created two programs although one of them isn't exact one I am gonna use once I am done but it was just something I was gonna use to test.

I have Arduino Uno that I want to receive data from an Arduino Nano.

Nano Code in void loop():

void mode1() {  // Glove Control Mode

  // Transmitter Code
  value1 = analogRead(flexPin1);
  value2 = analogRead(flexPin2);
  value3 = analogRead(flexPin3);
  value4 = analogRead(flexPin4);
  value5 = analogRead(flexPin5);

  flex1 = map(value1, 762, 861, 0, 180); // PINKY **
  flex1 = constrain(flex1, 0, 180); 

  flex2 = map(value2, 754, 836, 0, 180); // RING **
  flex2 = constrain(flex2, 0, 180);

  flex3 = map(value3, 806, 895, 0, 180); // THUMB ** *
  flex3 = constrain(flex3, 0, 180);

  flex4 = map(value4, 784, 876, 0, 180); // MIDDLE **
  flex4 = constrain(flex4, 0, 180);  

  flex5 = map(value5, 778, 875, 0, 180); // POINTER **
  flex5 = constrain(flex5, 0, 180);  

  transmit[0] = flex1;
  transmit[1] = flex2;
  transmit[2] = flex3;
  transmit[3] = flex4;
  transmit[4] = flex5;

  Serial.write((byte*)transmit,sizeof(transmit)); //get values to read on screen
  

  //get mode to read on screen.

  Serial.println("PINKY: " + String(transmit[0]));
  Serial.println("RING: " + String(transmit[1]));
  Serial.println("MIDDLE: " + String(transmit[2]));
  Serial.println("INDEX: " + String(transmit[3]));
  Serial.println("THUMB: " + String(transmit[4]));

  // Serial.println(flex1);
  // Serial.println(flex2);
  // Serial.println(flex3);
  // Serial.println(flex4);
  // Serial.println(flex5);

  delay(10);
}

Uno Code:

int receivedData[5];  //flex sensor values

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

void loop() {
  static byte receivedIndex = 0;
  static byte* receivedPtr = (byte*)receivedData;

  if (Serial.available()) {
    *receivedPtr = Serial.read();
    receivedPtr++;
    receivedIndex++;

    if (receivedIndex == sizeof(receivedData)) {
      // All data received, print the values
      for (int i = 0; i < 5; i++) {
        Serial.print("Finger ");
        Serial.print(i);
        Serial.print(": ");
        Serial.println(receivedData[i]);
      }

      // Reset for the next data set
      receivedIndex = 0;
      receivedPtr = (byte*)receivedData;
    }
  }

  // Rest of your code here
}

As individual programs they work great, although I can't really test the other without the Nano sending but the problem is as soon as I connect the tx/rx and ground pins so that they can communicate neither serial monitors will update and it seems as if the program completely freezes. Why is this?

I've sent a photo of the Nano circuit if that helps finding out the issue although I do not use the same ground where the capacitor goes through.

Transmitter Circuit
Transmitter Circuit1992×1204 132 KB

(The uno is just by itself)

2

Your project inter-arduino comms use Serial, so does Serial Monitor. Detect a conflict?

3

What do you mean by conflict exactly?

4

Your project's use of serial is still not clear to me, but I'll just step out. Good luck!

5

This a very base of what I want but I am just testing to see if I can actually received the values being sent which I am not.

6

Arduino UNO and Arduino Nano both have only one serial UART interface. Because the UART interface is not a bus, you cannot use it to communicate to another Arduino AND to the serial Monitor in the same sketch.

1 Like
7

One transmitter can send to multiple receivers at once, but you can't just short multiple transmitters together.

8

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.