NMEA Depth sensor

Other Hardware Sensors
1

Hi to all

Im new in this forum.
My knowledge in arduino are little.I have make small and basic projects.
I have start a new project and im not getting well because i find too less informations about it.
i have a depth sensor ATT-120AT http://www.cruzpro.co.nz/active.html

sensor output NMEA code like
$SDDBT,015.7,f,004.8,M,002.6,F*0D <-- depth in feet, meters and fathoms
$SDDPT,004.8,*75 <--- depth in meters only

im intresting read meters output.
I have connect red wire to 12volt +
green wire to pin Rx 0
and third wire to ground 12volt and arduino ground.

i have tryied 1 -2 code samples but have no results.

I would appreciate any help with the code.

thank you

2

It looks, by the information in the link, like the output is RS232. RS232 voltage levels are not compatible with the Arduino and in fact may damage the RX input. You will need a level converter like the MAX232 or 233 to change the RS232 levels to TTL for the Arduino serial port.

3

thanks for replay
when i test it with polymeter,voltage was 2-3.5 volt in green wire.and when i google it ,saw that pin 2 in rs232 take 5 volt.do you think converter is necessary?

4

I don't know for sure if the converter is necessary. What I was going by was that, in the connection diagrams, it says to connect to a computer RS232 port. A real RS232 port can have levels of + and - 15 volts.

5

I take your advise and use converter.

thanks a lot.

6

I tryed the SoftwareSerial

#include <SoftwareSerial.h>
 
 SoftwareSerial depthSerial = SoftwareSerial(8,7,true);
 void setup() {
   Serial.begin(9600);
   depthSerial.begin(4800);
 }
 
 void loop (){
      if (depthSerial.available()>0) {
       Serial.write(depthSerial.read());
      }
 }

and came up with this data

Now i would like to grab the the number from the line start $SDDPT and take it in a variable ($SDDPT,001.1,*79)

any ideas?

7

THIS DATA

text.jpg
text.jpg339×675 56.4 KB

8

I store serial data to a string

void loop (){
char c;
      if (depthSerial.available()>0) {
        
       c= depthSerial.read();

Data come with this form
$SDDPT,0.9,70,
$SDDBT,3.2,f,0.9,M,0.5,F0B,
$SDMTW,28.8,C*06,

i would like to take the number after "$SDDPT"

come on guys ,
i know its easy for most of you,i have tried all.

thanks

9

I have tryed this code for new start, but recieving "variable-sized object RFin_bytesmay not be initialized"
anyone can help

#include <SoftwareSerial.h>
 
 SoftwareSerial depthSerial = SoftwareSerial(0,1,true);
 void setup() {
   Serial.begin(9600);
   depthSerial.begin(4800);
 }
 
 void loop (){
      while (Serial.available()<6) {} // Wait 'till there are 9 Bytes waiting
for(int n=0; n<6; n++)
  char RFin_bytes[n] = Serial.read(); // Then: Get them.
 }
10

Still trying

#include <SoftwareSerial.h>
 
 SoftwareSerial depthSerial = SoftwareSerial(0,1,true);
  char got1[7]="";
   char look[7]="$SDDPT";
 
 void setup() {
   
   Serial.begin(9600);
   depthSerial.begin(4800);
   }
  
 void loop (){
      int i=i++;
      if (depthSerial.available()>0) {
     int c=(depthSerial.read());

      [color=yellow]char got[i]=c;[/color]
      
        Serial.print(got);
        delay(1000);
      }
     if i=6 & got=look{
       for (int x=0;x<5;x++);
       char depth[x]=(depthSerial.read());
     }
 if i=7{
   i=0;
 }
 }
 }

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
Arduino: 1.0.6 (Windows 7), Board: "Arduino Duemilanove w/ ATmega328"
readSonarOk.ino: In function 'void loop()':
readSonarOk:18: error: variable-sized object 'got' may not be initialized
readSonarOk:23: error: expected (' before 'i' readSonarOk:27: error: expected (' before 'i'
readSonarOk.ino: At global scope:
readSonarOk:31: error: expected declaration before '}' token

can you see what wrong?