MPLAB coding

Hi Terry,

It all depends on your inputs and outputs and what ratio you require from distance and volume

I'm a bit rusty with programming, but would it be worth looking at

d = distance in meters

v = volume

c = constant

v = c x d

So if you gave c a value of 2, v = 8 at 4m, and 16 at 8m.

You'd probably have to mess around a little converting the inputs and outputs to the right area for calculating

Thanks for your info.. but I am weak in programming, thats why looking for some help from here.

Best Regards,

Terry

terry_lee80@hotmail.com

Hi Terry,

It's very hard to guess what you need without knowing the input from the sensor (Digital/Analog), the distances you want to measure, and the sound output scale.

Ally

Terry,

I've also moved the discussion to Embedded Design. I think you have a much better chance of getting help here,

Regards,

Ally

Help me to take a look of this code.. there is not pulse for output port. what should i do?

#include <p18f4520.h>
#include "stdio.h"
#include "stdlib.h"
#include "SRF05.h"

void setup(void);
void setup_lcd(void);
void print_buff(void);
void set_cursor(unsigned char pos);
void SetTimer(unsigned int time);
void Wait4Timer(void);
void send_pulse(void);
void measure_pulse(void);

#define TRIG   LATDbits.LATD3   // used to trigger the srf05
#define ECHO   PORTDbits.RD3   // Used to read the echo pulse back from  SRF05

unsigned char s[21];       // used to print data to the LCD03

void main(void)
{
unsigned int range;

setup();
//setup_lcd();       // Clear LCD03 screen and hide cursor
//set_cursor(1);
// sprintf(s, "SRF05 Example");
// print_buff();

while(1)
{
  SetTimer(6500);      // Start a 50mS timer running with timer 0

  TRISDbits.TRISD3 = 0;    // Set the pin for SRF05 to output  
  send_pulse();      // Send a 10uS pulse to trigger the SRF05  
  TRISDbits.TRISD3 = 1;
   while(!ECHO);      // Wait for echo line to go high
  measure_pulse();     // Measure the length of the incoming pulse using timer 1

  range = (TMR1H << 8) + TMR1L;  // Get timer 1 values high byte and low byte into range
  range /= 58;      // Range is a reading in uS dividing this by 58 will give us the range
  //sprintf(s, "Range: %i  ", range);
     //set_cursor(21);
  //print_buff();

  Wait4Timer();      // Wait for the 50mS timer to finish before triggering the SRF05 again
}
}

/*****************
* SRF05 routines *
*****************/

void send_pulse(void)
{
TMR1H = 255;     // Set the clock to only need 2 counts to roll over   
TMR1L = 253;     // This will give us 10uS before it rolls over

TRIG = 1;       // Pin high to trigger ping from SRF05;

PIR1bits.TMR1IF = 0;   // Clear timer 1 interupt flag
T1CONbits.TMR1ON = 1;   // Start timer 1 running for 10us
while(PIR1bits.TMR1IF == 0); // Wait for interupt to be set
T1CONbits.TMR1ON = 0;
TRIG = 0;       // Pin output for SRF05 low
TMR1H = 0;      // Clear timer
TMR1L = 0;    
}

void measure_pulse(void)
{
T1CONbits.TMR1ON = 1;   // Start timer 1 counting
while(ECHO);     // Wait for echo line to go low
T1CONbits.TMR1ON = 0;
}

/*****************
* Timer Routines *
*****************/
void SetTimer(unsigned int time)
{
TMR0H = 0-(time/256);
TMR0L = 0-(time&0xff);
INTCONbits.TMR0IF = 0;
}

void Wait4Timer(void)
{
while(INTCONbits.TMR0IF==0);
}

/*************
* Chip setup *
*************/

void setup(void)
{
OSCCON = 0x70;    // set 8MHz

TRISDbits.TRISD3 = 0;  // pin output for SRF05
LATDbits.LATD3 = 0;  

T0CON = 0x83;    // 16bit, 64:1 prescaler
T1CON = 0x10;    // Timer 1 16bit: 2:1 prescaler

ADCON1 = 0x0f;    // all ports to digital
TRISC = 0x1F;
SSPSTAT = 0x80;    // slew diabled
SSPCON1 = 0x38;    // master mode enabled
SSPADD = 0x11;    // 100khz
}

Best Regards,

Terry
terry_lee80@hotmail.com

Hey guys,

           I have a question, I've just started out on the Arduino for a couple of months now, and i have an idea to try out on the Arduino, but don't have enough coding knowledge to do so. I do, however, have acquire some basic knowledge on coding overall. My question is, I have an idea on building a Novation Launchpad (Google that up if you don't know what that is) using just an Arduino UNO , a 4 x 4 keypad, and a speaker. My aim is to having it play some simple sounds, as well as able to combine those simple sounds to form a chord.

          To do this, i have already found a code called Multikey in the examples on the Arduino IDE. I have modified the code a little bit to make it work on a 4x4 Keypad.  What this code does is that it can keep track of how long you press a key on the keypad, as well as keeping track of multiple key presses. I figured i can make a few changes to the key to play a specific set of sounds found on pitch.h , but have no idea how to do so, so any help whether in the form of links / code would be very appreciated.

Thank you.

-Lim-

contact me at :

allforpro@gmail.com

Hello Lim,

Please start a new discussion for this, as it is not related to MPLAB coding (the subject of this thread).

You'll probably get more and better answers then!

Oh, I'm sorry. I didn't know this was not a related topic here, I'm new here, so i don't know where to reply to.

Thanks anyway

-Lim-