As we all know, an Arduino can't handle too many sensors and calculate all of them without freaking out, so sometimes we need to out source a sensor to other Arduino and let it calculate a value and send it to us in the master.
Wiring
RX ===> TX
TX ===> RX
GND ===> GND
I needed to send data to the other Arduino, and make it calculate it and send it over to me in the master.
Master code
char number = ' ';
String message = "";
bool send_data = true;
void setup()
{
Serial.begin(9600);
}
void loop()
{
while(send_data){
Serial.println("Little bord Hi!! ");
readData();
delay(2000);
if(message != ""){
if(message == "2222"){
send_data = false;
Serial.println("Message received");
Serial.println("******************");
Serial.println(message);
Serial.println("******************");
}
}
message = "";
}
}
void readData(){
while(Serial.available()){
if(Serial.available())
{
char number = Serial.read();
message += number ;
}
}
}
Slave code
char number = ' ';
String message = "";
bool is_not_sent = true;
void setup()
{
pinMode(LED_BUILTIN, OUTPUT);
Serial.begin(9600);
Serial.println("START");
}
void loop()
{
readData();
delay(2000);
if(is_not_sent)
{
if(message != ""){
message = "Big bro said : " + message;
// Serial.println(message);
digitalWrite(LED_BUILTIN, HIGH);
delay(500);
Serial.print(2222);
delay(500);
// Todo check wach correct data
is_not_sent = false;
message = "";
}
}
}
void readData(){
while(Serial.available()){
if(Serial.available())
{
char number = Serial.read();
message += number ;
}
}
}
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