[McHUG] Serial for debugging Arduino code

[Peter Morton]

Rich-

Is the WIRE library part of  the Arduino IDE or must it be downloaded from 
somewhere?

-Pete, W3GVX

----- Original Message ----- 
From: "Rich Mitchell" <geobra at att.net>
To: "McHUG Reflector" <mchug at mailman.qth.net>
Sent: Tuesday, November 04, 2008 12:19 PM
Subject: [McHUG] Serial for debugging Arduino code


> McHUGgers,
> I have been trying to convert Pete's Si570 code into an Arduino sketch 
> using the Wire library (TWI, I2C), so far without much success.  But along 
> the way I have discovered a good way to debug.  Use Serial that's already 
> part of Arduino, no library to include, initialize Serial in setup() and 
> write out statements and variables to your Serial console from the loop(). 
> If you are already using your serial cable and P4 to upload code to the 
> Arduino, there is no additional hardware setup.  All you have to do is 
> turn on Arduino's serial monitor (once you have uploaded the sketch) and 
> watch the statements come back.  I'm copyiing in the sketch for Blink and 
> adding Serial debugging statements that tell you if the led should be on 
> or off.  This should work okay, but I haven't got back to my Arduino 
> environment to test it.
>
> /* Blinking LED
> * ------------
> *
> * turns on and off a light emitting diode(LED) connected to a digital
> * pin, in intervals of 2 seconds. Ideally we use pin 13 on the Arduino
> * board because it has a resistor attached to it, needing only an LED
> *
> * Created 1 June 2005
> * copyleft 2005 DojoDave <http://www.0j0.org>
> * http://arduino.berlios.de
> *
> * based on an orginal by H. Barragan for the Wiring i/o board
> */
> int ledPin = 13;                 // LED connected to digital pin 13
> void setup()
> {
>  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
>  Serial.begin(9600);           // initialize Serial to 9600 baud.
> }
> void loop()
> {
>  digitalWrite(ledPin, HIGH);   // sets the LED on
>  Serial.print("Pin ");         // send a string using print
>  Serial.print(ledPin);         // send a variable using print
>  Serial.println(" is on."); // send string and CRLF with println
>  delay(1000);                  // waits for a second
>  digitalWrite(ledPin, LOW);    // sets the LED off
>  Serial.print("Pin ");         // send a string using print
>  Serial.print(ledPin);         // send a variable using print
>  Serial.println(" is off."); // send string and CRLF with println
>  delay(1000);                  // waits for a second
> }
>
>
> I've been using Serial.println() to see how far I'm getting in the Si570 
> sketch - which compiles fine.  When it tries to read reg 137, it just 
> hangs.  The Si570 chip starts a tone at 7.075 MHz which may be a default. 
> Anyway, the Serial class is a big help in debugging.
>
> Rich, N3III
> --
> McHUG - Physical Computing ;)
> MicroController Ham User Group
>
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