diff --git a/pcsensor.c b/pcsensor.c
index 7bc3d8a..2c4db16 100644
--- a/pcsensor.c
+++ b/pcsensor.c
@@ -8,7 +8,7 @@
  * modification, are permitted provided that the following conditions are met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY Juan Carlos Perez ''AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
@@ -19,22 +19,22 @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * 
+ *
  */
 
 #include "pcsensor.h"
- 
+
 #define INTERFACE1 (0x00)
 #define INTERFACE2 (0x01)
 #define SUPPORTED_DEVICES (2)
 
-const static unsigned short vendor_id[] = { 
-	0x1130,
-	0x0c45
+const static unsigned short vendor_id[] = {
+  0x1130,
+  0x0c45
 };
-const static unsigned short product_id[] = { 
-	0x660c,
-	0x7401
+const static unsigned short product_id[] = {
+  0x660c,
+  0x7401
 };
 
 const static char uTemperatura[] = { 0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00 };
@@ -49,320 +49,320 @@ const static char uCmd4[] = { 0x54,    0,    0,    0,    0,    0,    0,    0 };
 const static int reqIntLen=8;
 const static int reqBulkLen=8;
 const static int timeout=5000; /* timeout in ms */
- 
+
 static int debug=0;
 
 static int device_type(usb_dev_handle *lvr_winusb){
-	struct usb_device *dev;
-	int i;
-	dev = usb_device(lvr_winusb);
-	for(i =0;i < SUPPORTED_DEVICES;i++){
-		if (dev->descriptor.idVendor == vendor_id[i] && 
-			dev->descriptor.idProduct == product_id[i] ) {
-			return i;
-		}
-	}
-	return -1;
+  struct usb_device *dev;
+  int i;
+  dev = usb_device(lvr_winusb);
+  for(i =0;i < SUPPORTED_DEVICES;i++){
+    if (dev->descriptor.idVendor == vendor_id[i] &&
+      dev->descriptor.idProduct == product_id[i] ) {
+      return i;
+    }
+  }
+  return -1;
 }
 
 static int usb_detach(usb_dev_handle *lvr_winusb, int iInterface) {
-	int ret;
- 
-	ret = usb_detach_kernel_driver_np(lvr_winusb, iInterface);
-	if(ret) {
-		if(errno == ENODATA) {
-			if(debug) {
-				printf("Device already detached\n");
-			}
-		} else {
-			if(debug) {
-				printf("Detach failed: %s[%d]\n",
-					strerror(errno), errno);
-				printf("Continuing anyway\n");
-			}
-		}
-	} else {
-		if(debug) {
-			printf("detach successful\n");
-		}
-	}
-	return ret;
-} 
+  int ret;
+
+  ret = usb_detach_kernel_driver_np(lvr_winusb, iInterface);
+  if(ret) {
+    if(errno == ENODATA) {
+      if(debug) {
+        printf("Device already detached\n");
+      }
+    } else {
+      if(debug) {
+        printf("Detach failed: %s[%d]\n",
+          strerror(errno), errno);
+        printf("Continuing anyway\n");
+      }
+    }
+  } else {
+    if(debug) {
+      printf("detach successful\n");
+    }
+  }
+  return ret;
+}
 
 static usb_dev_handle *find_lvr_winusb() {
- 
-	struct usb_bus *bus;
-	struct usb_device *dev;
-	int i;
- 
-	for (bus = usb_busses; bus; bus = bus->next) {
-		for (dev = bus->devices; dev; dev = dev->next) {
-			for(i =0;i < SUPPORTED_DEVICES;i++){
-				if (dev->descriptor.idVendor == vendor_id[i] && 
-					dev->descriptor.idProduct == product_id[i] ) {
-					usb_dev_handle *handle;
-					if(debug) {
-						printf("lvr_winusb with Vendor Id: %x and Product Id: %x found.\n", vendor_id[i], product_id[i]);
-					}
-
-					if (!(handle = usb_open(dev))) {
-						if(debug){
-							printf("Could not open USB device\n");
-						}
-						return NULL;
-					}
-					return handle;
-				}
-			}
-		}
-	}
-	return NULL;
+
+  struct usb_bus *bus;
+  struct usb_device *dev;
+  int i;
+
+  for (bus = usb_busses; bus; bus = bus->next) {
+    for (dev = bus->devices; dev; dev = dev->next) {
+      for(i =0;i < SUPPORTED_DEVICES;i++){
+        if (dev->descriptor.idVendor == vendor_id[i] &&
+          dev->descriptor.idProduct == product_id[i] ) {
+          usb_dev_handle *handle;
+          if(debug) {
+            printf("lvr_winusb with Vendor Id: %x and Product Id: %x found.\n", vendor_id[i], product_id[i]);
+          }
+
+          if (!(handle = usb_open(dev))) {
+            if(debug){
+              printf("Could not open USB device\n");
+            }
+            return NULL;
+          }
+          return handle;
+        }
+      }
+    }
+  }
+  return NULL;
 }
 
 static usb_dev_handle* setup_libusb_access() {
-	usb_dev_handle *lvr_winusb;
-
-	if(debug) {
-		usb_set_debug(255);
-	} else {
-		usb_set_debug(0);
-	}
-	usb_init();
-	usb_find_busses();
-	usb_find_devices();
-
- 
-	if(!(lvr_winusb = find_lvr_winusb())) {
-		if(debug){
-			printf("Couldn't find the USB device, Exiting\n");
-		}
-		return NULL;
-	}
-        
-        
-	usb_detach(lvr_winusb, INTERFACE1);
-        
-
-	usb_detach(lvr_winusb, INTERFACE2);
-        
- 
-	if (usb_set_configuration(lvr_winusb, 0x01) < 0) {
-		if(debug){
-			printf("Could not set configuration 1\n");
-		}
-		return NULL;
-	}
- 
-
-	// Microdia tiene 2 interfaces
-	if (usb_claim_interface(lvr_winusb, INTERFACE1) < 0) {
-		if(debug){
-			printf("Could not claim interface\n");
-		}
-		return NULL;
-	}
- 
-	if (usb_claim_interface(lvr_winusb, INTERFACE2) < 0) {
-		if(debug){
-			printf("Could not claim interface\n");
-		}
-		return NULL;
-	}
- 
-	return lvr_winusb;
+  usb_dev_handle *lvr_winusb;
+
+  if(debug) {
+    usb_set_debug(255);
+  } else {
+    usb_set_debug(0);
+  }
+  usb_init();
+  usb_find_busses();
+  usb_find_devices();
+
+
+  if(!(lvr_winusb = find_lvr_winusb())) {
+    if(debug){
+      printf("Couldn't find the USB device, Exiting\n");
+    }
+    return NULL;
+  }
+
+
+  usb_detach(lvr_winusb, INTERFACE1);
+
+
+  usb_detach(lvr_winusb, INTERFACE2);
+
+
+  if (usb_set_configuration(lvr_winusb, 0x01) < 0) {
+    if(debug){
+      printf("Could not set configuration 1\n");
+    }
+    return NULL;
+  }
+
+
+  // Microdia tiene 2 interfaces
+  if (usb_claim_interface(lvr_winusb, INTERFACE1) < 0) {
+    if(debug){
+      printf("Could not claim interface\n");
+    }
+    return NULL;
+  }
+
+  if (usb_claim_interface(lvr_winusb, INTERFACE2) < 0) {
+    if(debug){
+      printf("Could not claim interface\n");
+    }
+    return NULL;
+  }
+
+  return lvr_winusb;
 }
- 
+
 static int ini_control_transfer(usb_dev_handle *dev) {
-	int r,i;
+  int r,i;
 
-	char question[] = { 0x01,0x01 };
+  char question[] = { 0x01,0x01 };
 
-	r = usb_control_msg(dev, 0x21, 0x09, 0x0201, 0x00, (char *) question, 2, timeout);
-	if( r < 0 )
-	{
-		if(debug){
-			printf("USB control write"); 
-		}
-		return -1;
-	}
+  r = usb_control_msg(dev, 0x21, 0x09, 0x0201, 0x00, (char *) question, 2, timeout);
+  if( r < 0 )
+  {
+    if(debug){
+      printf("USB control write");
+    }
+    return -1;
+  }
 
 
-	if(debug) {
-		for (i=0;i<reqIntLen; i++) printf("%02x ",question[i] & 0xFF);
-		printf("\n");
-	}
-	return 0;
+  if(debug) {
+    for (i=0;i<reqIntLen; i++) printf("%02x ",question[i] & 0xFF);
+    printf("\n");
+  }
+  return 0;
 }
- 
+
 static int control_transfer(usb_dev_handle *dev, const char *pquestion) {
-	int r,i;
-
-	char question[reqIntLen];
-    
-	memcpy(question, pquestion, sizeof question);
-
-	r = usb_control_msg(dev, 0x21, 0x09, 0x0200, 0x01, (char *) question, reqIntLen, timeout);
-	if( r < 0 )
-	{
-		if(debug){
-			printf("USB control write");
-		}
-		return -1;
-	}
-
-	if(debug) {
-		for (i=0;i<reqIntLen; i++) printf("%02x ",question[i]  & 0xFF);
-		printf("\n");
-	}
-	return 0;
+  int r,i;
+
+  char question[reqIntLen];
+
+  memcpy(question, pquestion, sizeof question);
+
+  r = usb_control_msg(dev, 0x21, 0x09, 0x0200, 0x01, (char *) question, reqIntLen, timeout);
+  if( r < 0 )
+  {
+    if(debug){
+      printf("USB control write");
+    }
+    return -1;
+  }
+
+  if(debug) {
+    for (i=0;i<reqIntLen; i++) printf("%02x ",question[i]  & 0xFF);
+    printf("\n");
+  }
+  return 0;
 }
 
 static int interrupt_read(usb_dev_handle *dev) {
- 
-	int r,i;
-	char answer[reqIntLen];
-	bzero(answer, reqIntLen);
-    
-	r = usb_interrupt_read(dev, 0x82, answer, reqIntLen, timeout);
-	if( r != reqIntLen )
-	{
-		if(debug){
-			printf("USB interrupt read");
-		}
-		return -1;
-	}
-
-	if(debug) {
-		for (i=0;i<reqIntLen; i++) printf("%02x ",answer[i]  & 0xFF);
-    
-		printf("\n");
-	}
-	return 0;
+
+  int r,i;
+  char answer[reqIntLen];
+  bzero(answer, reqIntLen);
+
+  r = usb_interrupt_read(dev, 0x82, answer, reqIntLen, timeout);
+  if( r != reqIntLen )
+  {
+    if(debug){
+      printf("USB interrupt read");
+    }
+    return -1;
+  }
+
+  if(debug) {
+    for (i=0;i<reqIntLen; i++) printf("%02x ",answer[i]  & 0xFF);
+
+    printf("\n");
+  }
+  return 0;
 }
 
 static int interrupt_read_temperatura(usb_dev_handle *dev, float *tempC) {
- 
-	int r,i, temperature;
-	char answer[reqIntLen];
-	bzero(answer, reqIntLen);
-    
-	r = usb_interrupt_read(dev, 0x82, answer, reqIntLen, timeout);
-	if( r != reqIntLen )
-	{
-		if(debug){
-			printf("USB interrupt read");
-		}
-		return -1;
-	}
-
-
-	if(debug) {
-		for (i=0;i<reqIntLen; i++) printf("%02x ",answer[i]  & 0xFF);
-    
-		printf("\n");
-	}
-    
-	temperature = (answer[3] & 0xFF) + (answer[2] << 8);
-	*tempC = temperature * (125.0 / 32000.0);
-	return 0;
+
+  int r,i, temperature;
+  char answer[reqIntLen];
+  bzero(answer, reqIntLen);
+
+  r = usb_interrupt_read(dev, 0x82, answer, reqIntLen, timeout);
+  if( r != reqIntLen )
+  {
+    if(debug){
+      printf("USB interrupt read");
+    }
+    return -1;
+  }
+
+
+  if(debug) {
+    for (i=0;i<reqIntLen; i++) printf("%02x ",answer[i]  & 0xFF);
+
+    printf("\n");
+  }
+
+  temperature = (answer[3] & 0xFF) + (answer[2] << 8);
+  *tempC = temperature * (125.0 / 32000.0);
+  return 0;
 }
 
 static int get_data(usb_dev_handle *dev, char *buf, int len){
-	return usb_control_msg(dev, 0xa1, 1, 0x300, 0x01, (char *)buf, len, timeout);
+  return usb_control_msg(dev, 0xa1, 1, 0x300, 0x01, (char *)buf, len, timeout);
 }
 
 static int get_temperature(usb_dev_handle *dev, float *tempC){
-	char buf[256];
-	int ret, temperature, i;
-
-	control_transfer(dev, uCmd1 );
-	control_transfer(dev, uCmd4 );
-	for(i = 0; i < 7; i++) {
-		control_transfer(dev, uCmd0 );
-	}
-	control_transfer(dev, uCmd2 );
-	ret = get_data(dev, buf, 256);
-	if(ret < 2) {
-		return -1;
-	}
-
-	temperature = (buf[1] & 0xFF) + (buf[0] << 8);	
-	*tempC = temperature * (125.0 / 32000.0);
-	return 0;
+  char buf[256];
+  int ret, temperature, i;
+
+  control_transfer(dev, uCmd1 );
+  control_transfer(dev, uCmd4 );
+  for(i = 0; i < 7; i++) {
+    control_transfer(dev, uCmd0 );
+  }
+  control_transfer(dev, uCmd2 );
+  ret = get_data(dev, buf, 256);
+  if(ret < 2) {
+    return -1;
+  }
+
+  temperature = (buf[1] & 0xFF) + (buf[0] << 8);
+  *tempC = temperature * (125.0 / 32000.0);
+  return 0;
 }
 
 usb_dev_handle* pcsensor_open(){
-	usb_dev_handle *lvr_winusb = NULL;
-	char buf[256];
-	int i, ret;
-
-	if (!(lvr_winusb = setup_libusb_access())) {
-		return NULL;
-	} 
-
-	switch(device_type(lvr_winusb)){
-	case 0:
-		control_transfer(lvr_winusb, uCmd1 );
-		control_transfer(lvr_winusb, uCmd3 );
-		control_transfer(lvr_winusb, uCmd2 );
-		ret = get_data(lvr_winusb, buf, 256);
-		if(debug){	
-			printf("Other Stuff (%d bytes):\n", ret);
-			for(i = 0; i < ret; i++) {
-				printf(" %02x", buf[i] & 0xFF);
-				if(i % 16 == 15) {
-					printf("\n");
-				}
-			}
-			printf("\n");
-		}
-		break;
-	case 1:
-		if (ini_control_transfer(lvr_winusb) < 0) {
-			fprintf(stderr, "Failed to ini_control_transfer (device_type 1)");
-			return NULL;
-		}
-      
-		control_transfer(lvr_winusb, uTemperatura );
-		interrupt_read(lvr_winusb);
- 
-		control_transfer(lvr_winusb, uIni1 );
-		interrupt_read(lvr_winusb);
- 
-		control_transfer(lvr_winusb, uIni2 );
-		interrupt_read(lvr_winusb);
-		interrupt_read(lvr_winusb);
-		break;
-	}
-
-	if(debug){
-		printf("device_type=%d\n", device_type(lvr_winusb));
-	}
-	return lvr_winusb;
+  usb_dev_handle *lvr_winusb = NULL;
+  char buf[256];
+  int i, ret;
+
+  if (!(lvr_winusb = setup_libusb_access())) {
+    return NULL;
+  }
+
+  switch(device_type(lvr_winusb)){
+  case 0:
+    control_transfer(lvr_winusb, uCmd1 );
+    control_transfer(lvr_winusb, uCmd3 );
+    control_transfer(lvr_winusb, uCmd2 );
+    ret = get_data(lvr_winusb, buf, 256);
+    if(debug){
+      printf("Other Stuff (%d bytes):\n", ret);
+      for(i = 0; i < ret; i++) {
+        printf(" %02x", buf[i] & 0xFF);
+        if(i % 16 == 15) {
+          printf("\n");
+        }
+      }
+      printf("\n");
+    }
+    break;
+  case 1:
+    if (ini_control_transfer(lvr_winusb) < 0) {
+      fprintf(stderr, "Failed to ini_control_transfer (device_type 1)");
+      return NULL;
+    }
+
+    control_transfer(lvr_winusb, uTemperatura );
+    interrupt_read(lvr_winusb);
+
+    control_transfer(lvr_winusb, uIni1 );
+    interrupt_read(lvr_winusb);
+
+    control_transfer(lvr_winusb, uIni2 );
+    interrupt_read(lvr_winusb);
+    interrupt_read(lvr_winusb);
+    break;
+  }
+
+  if(debug){
+    printf("device_type=%d\n", device_type(lvr_winusb));
+  }
+  return lvr_winusb;
 }
 
 void pcsensor_close(usb_dev_handle* lvr_winusb){
-	usb_release_interface(lvr_winusb, INTERFACE1);
-	usb_release_interface(lvr_winusb, INTERFACE2);
+  usb_release_interface(lvr_winusb, INTERFACE1);
+  usb_release_interface(lvr_winusb, INTERFACE2);
 
-	usb_close(lvr_winusb);
+  usb_close(lvr_winusb);
 }
 
 float pcsensor_get_temperature(usb_dev_handle* lvr_winusb){
-	float tempc;
-	int ret;
-	switch(device_type(lvr_winusb)){
-	case 0:
-		ret = get_temperature(lvr_winusb, &tempc);
-		break;
-	case 1:
-		control_transfer(lvr_winusb, uTemperatura );
-		ret = interrupt_read_temperatura(lvr_winusb, &tempc);
-		break;
-	}
-	if(ret < 0){
-		return FLT_MIN;
-	}
-	return tempc;
+  float tempc;
+  int ret;
+  switch(device_type(lvr_winusb)){
+  case 0:
+    ret = get_temperature(lvr_winusb, &tempc);
+    break;
+  case 1:
+    control_transfer(lvr_winusb, uTemperatura );
+    ret = interrupt_read_temperatura(lvr_winusb, &tempc);
+    break;
+  }
+  if(ret < 0){
+    return FLT_MIN;
+  }
+  return tempc;
 }
 
diff --git a/pcsensor.h b/pcsensor.h
index 485317e..f2a923e 100644
--- a/pcsensor.h
+++ b/pcsensor.h
@@ -8,7 +8,7 @@
  * modification, are permitted provided that the following conditions are met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY Juan Carlos Perez ''AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
@@ -19,7 +19,7 @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * 
+ *
  */
 
 #include <usb.h>
diff --git a/read_temp b/read_temp
new file mode 100755
index 0000000..a46a9b6
--- /dev/null
+++ b/read_temp
@@ -0,0 +1,14 @@
+#!/bin/dash
+
+BIN_PATH=$(dirname $(readlink -fn $0))
+cd $BIN_PATH
+
+die() {
+  >&2 echo "failed to read from temperature sensor."
+  exit $1
+}
+
+reading=$(./temper) || die $?
+temp=$(echo $reading | sed 's/.*,//')
+echo "$temp ºC"
+exit 0
diff --git a/temper.c b/temper.c
index 5670bb5..a3cfb04 100644
--- a/temper.c
+++ b/temper.c
@@ -4,55 +4,61 @@
  */
 
 #include <stdio.h>
+#include <errno.h>
 #include <time.h>
 #include "pcsensor.h"
 
 /* Calibration adjustments */
 /* See http://www.pitt-pladdy.com/blog/_20110824-191017_0100_TEMPer_under_Linux_perl_with_Cacti/ */
-static float scale = 1.0287;
-static float offset = -0.85;
+static float scale = 1;
+static float offset = 0;
+
+float read_temp() {
+  int i;
+  float tempc = 0.0000;
+
+  for (i = 0; i < 4; i++) {
+    usb_dev_handle* lvr_winusb = pcsensor_open();
+    if (!lvr_winusb) {
+      sleep(3);
+      continue;
+    }
+    tempc = pcsensor_get_temperature(lvr_winusb);
+    pcsensor_close(lvr_winusb);
+
+  /* Read can fail silently with a 0.0 return; repeat until we get a not zero
+   * value or until we have read a zero value 3 times (just in case the
+   * temperature really is zero */
+    if (tempc < -0.0001 || tempc > 0.0001) { return tempc; }
+  }
+  errno = ENOENT;
+  return tempc;
+}
+
+float correct(float tempc) {
+  return (tempc * scale) + offset;
+}
+
+void print_temp(float tempc) {
+  struct tm *utc;
+  time_t t;
+  t = time(NULL);
+  utc = localtime(&t);
+
+  char dt[80];
+  strftime(dt, 80, "%F %T", utc);
+
+  printf("%s,%2.2f\n", dt, tempc);
+  fflush(stdout);
+}
 
 int main(){
-	int passes = 0;
-	float tempc = 0.0000;
-	do {
-		usb_dev_handle* lvr_winusb = pcsensor_open();
-
-		if (!lvr_winusb) {
-			/* Open fails sometime, sleep and try again */
-			sleep(3);
-		}
-		else {
-	
-			tempc = pcsensor_get_temperature(lvr_winusb);
-			pcsensor_close(lvr_winusb);
-		}
-		++passes;
-	}
-	/* Read fails silently with a 0.0 return, so repeat until not zero
-	   or until we have read the same zero value 3 times (just in case
-	   temp is really dead on zero */
-	while ((tempc > -0.0001 && tempc < 0.0001) || passes >= 4);
-
-	if (!((tempc > -0.0001 && tempc < 0.0001) || passes >= 4)) {
-		/* Apply calibrations */
-		tempc = (tempc * scale) + offset;
-
-		struct tm *utc;
-		time_t t;
-		t = time(NULL);
-		utc = gmtime(&t);
-		
-		char dt[80];
-		strftime(dt, 80, "%d-%b-%Y %H:%M", utc);
-
-		printf("%s,%f\n", dt, tempc);
-		fflush(stdout);
-
-		return 0;
-	}
-	else {
-		return 1;
-	}
+  float tempc = read_temp();
 
+  if (errno == ENOENT) {
+    return 1;
+  } else {
+    print_temp(correct(tempc));
+    return 0;
+  }
 }