I think your timer may have a hickup when rolling over to zero.

micros() should use a "unsigned long" and not a "double"

K

Does anyone know of a library that can read a quadrature encoder and can calculate speed, acceleration, declaration, position etc
Searched the net by found nothing yet

Ta

I ran Ubuntu fine, but is now running Mint (a Ubuntu derivative).
There is/was an issue occasionally with the USB drivers under Linux.
You may want to search for this in the Ubuntu forum.

Does the standard Arduino IDE run and download fine ?

Cheers for that.
Coming from a 8bit assembly world, C can be a bit hard to to interpret at time
int used to be a byte for me

getting there
:-)

the following code has a compiler error, which I don't quite understand

Code:

int serialArrayOne[]  = {1,2,3,4,5,6,7,8};

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.write(serialArrayOne,8);
}

error is:
sketch_jan15a.cpp: In function ‘void loop()’:
sketch_jan15a.cpp:19:32: error: no matching function for call to ‘HardwareSerial::write(int [8], int)’
/usr/share/arduino/hardware/arduino/cores/arduino/HardwareSerial.h:58:20: note: candidates are: virtual size_t HardwareSerial::write(uint8_t)
/usr/share/arduino/hardware/arduino/cores/arduino/Print.h:50:20: note:                 virtual size_t Print::write(const uint8_t*, size_t)
/usr/share/arduino/hardware/arduino/cores/arduino/Print.h:49:12: note:                 size_t Print::write(const char*)

The manual says
Serial.write(buf, len)
buf: an array to send as a series of bytes
len: the length of the buffer

Anyone care to enlighten me

Cheers
Kim

Sorted.

For some reason I commented out 
//#include <RS485_protocol.h>
and included
#include <RS485_non_blocking.h>

when both should be included.
Sometimes you just can't see the forest for the trees

Cheers

Straight from Nick Gammon site
http://www.gammon.com.au/forum/?id=11428

Hi

I have downloaded Nick Gammon code, but are having some compiling issues.
I got it down to 2 errors

Code:

//#include "WConstants.h"
#include <RS485_non_blocking.h>
//#include "RS485_protocol.h"
#include <SoftwareSerial.h>

const byte ENABLE_PIN = 4;
const byte LED_PIN = 13;

SoftwareSerial rs485(2, 3);  // receive pin, transmit pin

// callback routines
 
void fWrite (const byte what)
  {
  rs485.print (what); 
  }
 
int fAvailable ()
  {
  return rs485.available (); 
  }

int fRead ()
  {
  return rs485.read (); 
  }

void setup()
{
  rs485.begin (28800);
  pinMode (ENABLE_PIN, OUTPUT);  // driver output enable
  pinMode (LED_PIN, OUTPUT);  // built-in LED
}  // end of setup
 
byte old_level = 0;

void loop()
{

  // read potentiometer
  byte level = analogRead (0) / 4;
 
  // no change? forget it
  if (level == old_level)
    return;
     
  // assemble message
  byte msg [] = {
     1,    // device 1
     2,    // turn light on
     level // to what level
  };

  // send to slave 
  digitalWrite (ENABLE_PIN, HIGH);  // enable sending
  sendMsg (fWrite, msg, sizeof msg);
  digitalWrite (ENABLE_PIN, LOW);  // disable sending

  // receive response 
  byte buf [10];
  byte received = recvMsg (fAvailable, fRead, buf, sizeof buf);
 
  digitalWrite (LED_PIN, received == 0);  // turn on LED if error   
 
  // only send once per successful change
  if (received)
    old_level = level;

}  // end of loop

Errors are:
sketch_jan14a.cpp: In function ‘void loop()’:
sketch_jan14a.cpp:62:35: error: ‘sendMsg’ was not declared in this scope
sketch_jan14a.cpp:67:62: error: ‘recvMsg’ was not declared in this scope

But what do I replace the sendMsg with.
I have looked through the SoftwareSerial.cpp and .h files but nothing springs to mind

Thanks for any suggestions

Kim

dreschel

Did you get the encoder to work ?
It appear that only 1 of the the 2 Quadrature channels pins have been connected to pins.

I suggest using something like Ken Smith's paper is describing:

"C++ Hardware Register Access Redux"

Its a policy based design using function templates and once setup has clarity and safety.

Sweet.
Thanks for that

I can't for the life of me work out why the code below doesn't work.
Never gets to the ELSE statement, something keeps changing the "pinstate" back to zero

Cheers
K

Code:

void BlinkLED13()
{
  // blinks LED 13
  int pinstate;      // state of the output pin

  if (pinstate == 0)
  {
    digitalWrite(ledPin, pinstate);
    pinstate = 1; 
    delay(100);
  }
  else
  {
    digitalWrite(ledPin, pinstate);
    pinstate = 0;
    delay(100);
  }

}

Ha

I was so busy thinking about it, before buggering of to work, that I missed the obvious.

Cheers

I'm trying to get my head around arrays in C.

I can do the following as to assign i/o pins via an array
int pins [6] = { 3, 5, 7, 10, 12, 13 }

However, can I assign a name to a pin and then use it in the array

const int Button1 = 3;
int pins [6] = { Button1, 5, 7, 10, 12, 13 }

thanks for any clarification

K

The LED on pin 13 is most useful at times, especially during debugging, so it would be wise to leave it, IMHO.
K