Hi everyone,
I have just bought a URM37 V3.2 sensor but unfortunately it is not working. The context is the following one:
Arduino MEGA 2560
Sensor URM37 V3.2 (TTL mode). Pin 9 connected to pin 6 of Arduino. Pin 8 connected to pin 7 of Arduino
The code I am using is the one provided by DFROBOT (I did not change it, just copy and paste):
/*
DistanceBySoftwareSerial.pde - URM 37 Control Library Version 2.0.0
Author: Miles Burton, miles@mnetcs.com
Copyright (c) 2009 Miles Burton All Rights Reserved
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// # This library is a improvement version of URM 37 Control Library Version 2.0.0 from Miles Burton
// # Original Author: Miles Burton, miles@mnetcs.com
// #
// # Editor : Lauren from DFRobot
// # Date : 08.05.2012
// # Product name: URM V3.2 ultrasonic sensor TTL connection with Arduino
// # Product SKU : SEN0001
// # Version : 1.0
// # Update the library to make it compatible with the Arduino IDE 1.0 or the latest version
// # Description:
// # The sketch for using the URM37 from DFRobot based on the Software Serial library
// # You could drive the URM37 with 2 digital pins on your Arduino board, and it works stable.
// # Connection:
// # VCC (Arduino) -> Pin 1 VCC (URM37 V3.2)
// # GND (Arduino) -> Pin 2 GND (URM37 V3.2)
// # Pin 6 (Arduino) -> Pin 9 TXD (URM37 V3.2)
// # Pin 7 (Arduino) -> Pin 8 RXD (URM37 V3.2)
// #
#include "URMSerial.h"
// The measurement we're taking
#define DISTANCE 1
#define TEMPERATURE 2
#define ERROR 3
#define NOTREADY 4
#define TIMEOUT 5
URMSerial urm;
void setup() {
Serial.begin(9600); // Sets the baud rate to 9600
urm.begin(6,7,9600); // RX Pin, TX Pin, Baud Rate
Serial.println("URM37 Library by Miles Burton"); // Shameless plug
}
void loop()
{
Serial.print("Measurement: ");
delay(2000);
Serial.println(getMeasurement()); // Output measurement
}
int value; // This value will be populated
int getMeasurement()
{
// Request a distance reading from the URM37
switch(urm.requestMeasurementOrTimeout(DISTANCE, value)) // Find out the type of request
{
case DISTANCE: // Double check the reading we recieve is of DISTANCE type
// Serial.println(value); // Fetch the distance in centimeters from the URM37
return value;
break;
case TEMPERATURE:
return value;
break;
case ERROR:
Serial.println("Error");
break;
case NOTREADY:
Serial.println("Not Ready");
break;
case TIMEOUT:
Serial.println("Timeout");
break;
}
return -1;
}
The output is always the same: TIMEOUT. So basically, I get no value.
Can anyone help on this issue?
Best regards,
Miguel