Serial Communication Problem

Projects Programming
1

Good day! i am having trouble with Serial Communication. I wanted the serial monitor to print the value i sent but it also prints another value other than the one i sent. For example i send 1 it displays 1 and -38. Any help will be much appreciated! Thank You.

Here is my code:

void setup() {
        Serial.begin(9600);     // opens serial port, sets data rate to 9600 bps
}

void loop() {

        // send data only when you receive data:
        if (Serial.available() > 0) {
                // read the incoming byte:
              int val = Serial.read()-"0";

                // say what you got:
                Serial.print("I received: ");
                Serial.println(val);
        }
}

Here is a screenshot of the serial monitor

sc serial.png
sc serial.png1366×980 21.3 KB

2

What has this got to do with the website or forum?

Check the serial monitor line ending.
It should be 'None'.

3 
int val = Serial.read()-'0';