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Weird values when reading serial port. Arduino and Processing

[1 Reply]
- 17-May-2012 10:56 AM
- Forum: Integration and Hardware
Hi, I'm very new to Processing and Arduino!

I have downloaded a code to Arduino that reads a LDR sensor and prints out 1 or 2 on the serial monitor. But when I try to read the Arduino serial port in processing it's just random number like this:

13

10

50

30

....

Could someone help me and maybe see what I've done wrong? I want to get either 1 or 2 in Processing as I get in the serial monitor in Arduino.

Arduino code (from arduino.cc)
1. const int sensorPin = A0;
2. const int ledPin = 9;
4. int sensorValue = 0;
5. int sensorMin = 1023;
6. int sensorMax = 0;
8. void setup() {
10. pinMode(13, OUTPUT);
11. digitalWrite(13, HIGH);
12. Serial.begin(9600);
14. while (millis() < 5000) {
15. sensorValue = analogRead(sensorPin);
17. if (sensorValue > sensorMax) {
18. sensorMax = sensorValue;
19. }
21. if (sensorValue < sensorMin) {
22. sensorMin = sensorValue;
23. }
24. }
26. digitalWrite(13, LOW);
27. }
29. void loop() {
31. sensorValue = analogRead(sensorPin);
32. sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);
33. sensorValue = constrain(sensorValue, 0, 255);
35. if (sensorValue < 50) {
37. analogWrite(ledPin, sensorValue);
38. Serial.println(1);
39. } else {
41. analogWrite(ledPin, sensorValue);
42. Serial.println(2);
43. }
44. }
Processing code
1. import processing.serial.*;
3. Serial serial;
4. int val;
6. void setup() {
8. size(200,200);
9. frameRate(100);
10. int serialPortNumber = 0;
12. println(Serial.list());
13. String port = Serial.list()[serialPortNumber];
14. serial = new Serial(this, port, 9600);
16. }
18. void draw() {
20. val = serial.read();
21. println(val);
23. }
Thanks in advance!

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