Changing the range of SRF 10 ultrasonic distance sensor

hallo

i use arduino uno connected ethernet shield (there micro sd in ethernet shield board saving datalog in txt). then, connect ethernet shield srf 10 devantech ultrasonic distance sensor. used coding

#include <wire.h>
#include <spi.h>
#include <sd.h>
string cm = " cm";
const int chipselect = 4;
void setup() {
  wire.begin();                // join i2c bus (address optional master)
  serial.begin(9600);          // start serial communication @ 9600bps
 
  serial.print("initializing sd card...");
 
  // see if card present , can initialized:
  if (!sd.begin(chipselect)) {
    serial.println("card failed, or not present");
   // don't more:
    // return;
  }
  serial.println("card initialized.");
}
 
int reading = 0;
 
void loop() {
  string datastring = "";
 
  // step 1: instruct sensor read echoes
  wire.begintransmission(112); // transmit device #112 (0x70)
  // address specified in datasheet 224 (0xe0)
  // i2c adressing uses high 7 bits it's 112
  wire.write(byte(0x00));      // sets register pointer command register (0x00)
  wire.write(byte(0x51));      // command sensor measure in "inches" (0x50)
  // use 0x51 centimeters
  // use 0x52 ping microseconds
  wire.endtransmission();      // stop transmitting
 
  // step 2: wait readings happen
  delay(65);                   // datasheet suggests @ least 65 milliseconds
 
  // step 3: instruct sensor return particular echo reading
  wire.begintransmission(112); // transmit device #112
  wire.write(byte(0x02));      // sets register pointer echo #1 register (0x02)
  wire.endtransmission();      // stop transmitting
 
  // step 4: request reading sensor
  wire.requestfrom(112, 2);    // request 2 bytes slave device #112
 
  // step 5: receive reading sensor
  if (2 <= wire.available()) { // if 2 bytes received
    reading = wire.read();  // receive high byte (overwrites previous reading)
    reading = reading << 8;    // shift high byte high 8 bits
    reading |= wire.read(); // receive low byte lower 8 bits
   // serial.println(reading);   // print reading
  }
  datastring = string(reading);
  datastring += cm;
  file datafile = sd.open("datalog.txt", file_write);
 
  // if file available, write it:
  if (datafile) {
    datafile.println(datastring);
    datafile.close();
    // print serial port too:
    serial.println(datastring);
  }
  // if file isn't open, pop error:
  else {
    serial.println("error opening datalog.txt");
  }
 
  delay(1000);                  // wait bit since people have read output
}
 
 
/*
 
// following code changes address of devantech ultrasonic range finder (srf10 or srf08)
// usage: changeaddress(0x70, 0xe6);
 
void changeaddress(byte oldaddress, byte newaddress)
{
  wire.begintransmission(oldaddress);
  wire.write(byte(0x00));
  wire.write(byte(0xa0));
  wire.endtransmission();
 
  wire.begintransmission(oldaddress);
  wire.write(byte(0x00));
  wire.write(byte(0xaa));
  wire.endtransmission();
 
  wire.begintransmission(oldaddress);
  wire.write(byte(0x00));
  wire.write(byte(0xa5));
  wire.endtransmission();
 
  wire.begintransmission(oldaddress);
  wire.write(byte(0x00));
  wire.write(newaddress);
  wire.endtransmission();
}
 
*/


this sensor can reach 6 meters. but, when used coding above, maximum range 50 cm. based on srf 10 website, can change range modify in register range. website: http://www.robot-electronics.co.uk/htm/srf10tech.htm. but, still don't understand, place of coding, can change.


can me please modify coding? optimal range (up 6 meters).


thank you

quote

by default, ranging lasts 65ms, can changed writing range register @ location 2.
...
the maximum range of srf10 set internal timer. default, 65ms or equivalent of 11 metres of range.
...
the range ((range register x 43mm) + 43mm)

just use formula calculate value range register, , write location 2.

but please, use code tags.

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