Good morning/afternoon/evening. I'm trying to build this project and I have two arduinos (Emitter & Receiver) and they're gonna comunicate using RF control. The emitter/controller reads 2 different analog inputs with potentiometers connected, creates an String called "parametro" with the values of both potentiometers (Ex: "05120512" - 50%/50% - "10231023" - 100%/100%) and send this String via serial to the receiver using Serial.print(parametro). It works just fine.
The problem is: how to read that String as a String on the other Arduino. I've tried to read each byte of the String and create a char array with the values, and then, convert it back to String. However, there are some bug I can't explain. I tried to change the delay() time and it worked at first, but then, the numbers got random or something. I left the potenciometers on the middle position, so when I use Serial.print(parametro) to send data from the controller straight to the serial monitor it works as expected: "05120512051205120512...."
But when I try to send it from the receiver using Serial.println(parametro), it gives me something like:
As you can see, at that point the numbers start to get messed up and I don't understand why. Can anyone show me another solution or tell me what I did wrong?
By the way, here are the codes of the receiver. The emitter works fine, as I said:
// READING FUNCTION
String lerString(){
String conteudo = "";
char caracteres[8];
// WHILE RECEIVING
for(int i=0;i<=7;i++){
caracteres[i] = Serial.read();
delay(10);
conteudo.concat(caracteres[i]);
}
return conteudo;
}
void loop() {
// SERIAL READ
if(Serial.available() > 0){
parametro = lerString();
}
Serial.println(parametro);
}You would get a more robust implementation if you use a delimiter and implement a simple state machine to walk you through the parsing (ie. string -> "#05120512" that way your receiving function could look like:
void loop () {
if (Serial.available) {
byte = Serial.read();
if (byte == '#') {
// got delimiter: start receiving data
leState = RECEIVING_DATA
count = 0;
} else if (leState == RECEVING_DATA){
count++;
data[count] = byte;
if (count == 7) {
// print data
...
// reset state machine
leState = WAITING_FOR_DELIMITER;
}
}
}
}
Warning: untested code - proceed with caution