How do I transmit data between two arduinos using Serial communication?

Projects Programming
1

I am trying to send data between two arduinos , but all I get at the receiver side is garbage values.How should I go about doing this? These are the codes I used.

TRANSMITTER:

String sent = "I am 19 years old";

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
 Serial.print(sent); 
 
}

RECEIVER:

String recieve;
void setup() {
  // put your setup code here, to run once:
   Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
   recieve = Serial.read();
   Serial.println(recieve);
   delay(1);
}

NOTE: I have already used readString() function , but it didn't work.

2

It might be better if you tested to see whether any data was available before blindly reading what is probably not there.

4

Have a look at the examples in Serial Input Basics - simple reliable ways to receive data. The system in the 3rd example will be the most reliable.

Try this for sending

Serial.println("<hello world>)"
delay(1000);

It is not a good idea to use the String (capital S) class on an Arduino as it can cause memory corruption in the small memory on an Arduino. Just use cstrings - char arrays terminated with 0.

recieve = Serial.read();

Note that Serial.read() just reads a single character

Also note that loop() repeats incredibly fast. You need to include a delay() or you will overwhelm the serial system.

...R