diff --git a/99-tempsensor.rules b/99-tempsensor.rules
new file mode 100644
index 0000000..30a2e1e
--- /dev/null
+++ b/99-tempsensor.rules
@@ -0,0 +1 @@
+SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="0c45", ATTRS{idProduct}=="7401", MODE="666"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..0557550
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,12 @@
+all:	pcsensor
+
+CFLAGS = -O2 -Wall
+
+pcsensor:	pcsensor.c
+	${CC} -DUNIT_TEST -o $@ $^ -lusb
+
+clean:		
+	rm -f pcsensor *.o
+
+rules-install:			# must be superuser to do this
+	cp 99-tempsensor.rules /etc/udev/rules.d
diff --git a/pcsensor b/pcsensor
new file mode 100755
index 0000000..ea22415
Binary files /dev/null and b/pcsensor differ
diff --git a/pcsensor.c b/pcsensor.c
new file mode 100644
index 0000000..ea2b03b
--- /dev/null
+++ b/pcsensor.c
@@ -0,0 +1,450 @@
+/*
+ * pcsensor.c by Juan Carlos Perez (c) 2011 (cray@isp-sl.com)
+ * based on Temper.c by Robert Kavaler (c) 2009 (relavak.com)
+ * All rights reserved.
+ *
+ * 2011/08/30 Thanks to EdorFaus: bugfix to support negative temperatures
+ *
+ * Temper driver for linux. This program can be compiled either as a library
+ * or as a standalone program (-DUNIT_TEST). The driver will work with some
+ * TEMPer usb devices from RDing (www.PCsensor.com).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * 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
+ * DISCLAIMED. IN NO EVENT SHALL Robert kavaler BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * 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>
+#include <stdio.h>
+#include <time.h>
+
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+
+
+#define VERSION "1.0.1"
+
+#define VENDOR_ID  0x0c45
+#define PRODUCT_ID 0x7401
+
+#define INTERFACE1 0x00
+#define INTERFACE2 0x01
+
+const static int reqIntLen=8;
+const static int reqBulkLen=8;
+const static int endpoint_Int_in=0x82; /* endpoint 0x81 address for IN */
+const static int endpoint_Int_out=0x00; /* endpoint 1 address for OUT */
+const static int endpoint_Bulk_in=0x82; /* endpoint 0x81 address for IN */
+const static int endpoint_Bulk_out=0x00; /* endpoint 1 address for OUT */
+const static int timeout=5000; /* timeout in ms */
+
+const static char uTemperatura[] = { 0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00 };
+const static char uIni1[] = { 0x01, 0x82, 0x77, 0x01, 0x00, 0x00, 0x00, 0x00 };
+const static char uIni2[] = { 0x01, 0x86, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00 };
+
+static int bsalir=1;
+static int debug=0;
+static int seconds=5;
+static int formato=0;
+static int mrtg=0;
+static int calibration=0;
+
+
+void bad(const char *why) {
+        fprintf(stderr,"Fatal error> %s\n",why);
+        exit(17);
+}
+
+
+usb_dev_handle *find_lvr_winusb();
+
+void 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");
+		}
+	}
+}
+
+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())) {
+                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) {
+                printf("Could not set configuration 1\n");
+                return NULL;
+        }
+
+
+        // Microdia tiene 2 interfaces
+        if (usb_claim_interface(lvr_winusb, INTERFACE1) < 0) {
+                printf("Could not claim interface\n");
+                return NULL;
+        }
+
+        if (usb_claim_interface(lvr_winusb, INTERFACE2) < 0) {
+                printf("Could not claim interface\n");
+                return NULL;
+        }
+
+        return lvr_winusb;
+}
+
+
+
+usb_dev_handle *find_lvr_winusb() {
+
+     struct usb_bus *bus;
+        struct usb_device *dev;
+
+        for (bus = usb_busses; bus; bus = bus->next) {
+        for (dev = bus->devices; dev; dev = dev->next) {
+                        if (dev->descriptor.idVendor == VENDOR_ID &&
+                                dev->descriptor.idProduct == PRODUCT_ID ) {
+                                usb_dev_handle *handle;
+                                if(debug) {
+                                  printf("lvr_winusb with Vendor Id: %x and Product Id: %x found.\n", VENDOR_ID, PRODUCT_ID);
+                                }
+
+                                if (!(handle = usb_open(dev))) {
+                                        printf("Could not open USB device\n");
+                                        return NULL;
+                                }
+                                return handle;
+                        }
+                }
+        }
+        return NULL;
+}
+
+
+void ini_control_transfer(usb_dev_handle *dev) {
+    int r,i;
+
+    char question[] = { 0x01,0x01 };
+
+    r = usb_control_msg(dev, 0x21, 0x09, 0x0201, 0x00, (char *) question, 2, timeout);
+    if( r < 0 )
+    {
+          perror("USB control write"); bad("USB write failed");
+    }
+
+
+    if(debug) {
+      for (i=0;i<reqIntLen; i++) printf("%02x ",question[i] & 0xFF);
+      printf("\n");
+    }
+}
+
+void 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 )
+    {
+          perror("USB control write"); bad("USB write failed");
+    }
+
+    if(debug) {
+        for (i=0;i<reqIntLen; i++) printf("%02x ",question[i]  & 0xFF);
+        printf("\n");
+    }
+}
+
+void interrupt_transfer(usb_dev_handle *dev) {
+
+    int r,i;
+    char answer[reqIntLen];
+    char question[reqIntLen];
+    for (i=0;i<reqIntLen; i++) question[i]=i;
+    r = usb_interrupt_write(dev, endpoint_Int_out, question, reqIntLen, timeout);
+    if( r < 0 )
+    {
+          perror("USB interrupt write"); bad("USB write failed");
+    }
+    r = usb_interrupt_read(dev, endpoint_Int_in, answer, reqIntLen, timeout);
+    if( r != reqIntLen )
+    {
+          perror("USB interrupt read"); bad("USB read failed");
+    }
+
+    if(debug) {
+       for (i=0;i<reqIntLen; i++) printf("%i, %i, \n",question[i],answer[i]);
+    }
+
+    usb_release_interface(dev, 0);
+}
+
+void interrupt_read(usb_dev_handle *dev) {
+
+    int r,i;
+    unsigned char answer[reqIntLen];
+    bzero(answer, reqIntLen);
+
+    r = usb_interrupt_read(dev, 0x82, answer, reqIntLen, timeout);
+    if( r != reqIntLen )
+    {
+          perror("USB interrupt read"); bad("USB read failed");
+    }
+
+    if(debug) {
+       for (i=0;i<reqIntLen; i++) printf("%02x ",answer[i]  & 0xFF);
+
+       printf("\n");
+    }
+}
+
+void interrupt_read_temperatura(usb_dev_handle *dev, float *tempC) {
+
+    int r,i, temperature;
+    unsigned char answer[reqIntLen];
+    bzero(answer, reqIntLen);
+
+    r = usb_interrupt_read(dev, 0x82, answer, reqIntLen, timeout);
+    if( r != reqIntLen )
+    {
+          perror("USB interrupt read"); bad("USB read failed");
+    }
+
+
+    if(debug) {
+      for (i=0;i<reqIntLen; i++) printf("%02x ",answer[i]  & 0xFF);
+
+      printf("\n");
+    }
+
+    temperature = (answer[3] & 0xFF) + ((signed char)answer[2] << 8);
+    temperature += calibration;
+    *tempC = temperature * (125.0 / 32000.0);
+
+}
+
+void bulk_transfer(usb_dev_handle *dev) {
+
+    int r,i;
+    char answer[reqBulkLen];
+
+    r = usb_bulk_write(dev, endpoint_Bulk_out, NULL, 0, timeout);
+    if( r < 0 )
+    {
+          perror("USB bulk write"); bad("USB write failed");
+    }
+    r = usb_bulk_read(dev, endpoint_Bulk_in, answer, reqBulkLen, timeout);
+    if( r != reqBulkLen )
+    {
+          perror("USB bulk read"); bad("USB read failed");
+    }
+
+
+    if(debug) {
+      for (i=0;i<reqBulkLen; i++) printf("%02x ",answer[i]  & 0xFF);
+    }
+
+    usb_release_interface(dev, 0);
+}
+
+
+void ex_program(int sig) {
+      bsalir=1;
+
+      (void) signal(SIGINT, SIG_DFL);
+}
+
+int main( int argc, char **argv) {
+
+     usb_dev_handle *lvr_winusb = NULL;
+     float tempc;
+     int c;
+     struct tm *local;
+     time_t t;
+
+     while ((c = getopt (argc, argv, "mfcvhl::a:")) != -1)
+     switch (c)
+       {
+       case 'v':
+         debug = 1;
+         break;
+       case 'c':
+         formato=1; //Celsius
+         break;
+       case 'f':
+         formato=2; //Fahrenheit
+         break;
+       case 'm':
+         mrtg=1;
+         break;
+       case 'l':
+         if (optarg!=NULL){
+           if (!sscanf(optarg,"%i",&seconds)==1) {
+             fprintf (stderr, "Error: '%s' is not numeric.\n", optarg);
+             exit(EXIT_FAILURE);
+           } else {
+              bsalir = 0;
+              break;
+           }
+         } else {
+           bsalir = 0;
+           seconds = 5;
+           break;
+         }
+       case 'a':
+         if (!sscanf(optarg,"%i",&calibration)==1) {
+             fprintf (stderr, "Error: '%s' is not numeric.\n", optarg);
+             exit(EXIT_FAILURE);
+         } else {
+              break;
+         }
+       case '?':
+       case 'h':
+         printf("pcsensor version %s\n",VERSION);
+	 printf("      Aviable options:\n");
+	 printf("          -h help\n");
+	 printf("          -v verbose\n");
+	 printf("          -l[n] loop every 'n' seconds, default value is 5s\n");
+	 printf("          -c output only in Celsius\n");
+	 printf("          -f output only in Fahrenheit\n");
+	 printf("          -a[n] increase or decrease temperature in 'n' degrees for device calibration\n");
+	 printf("          -m output for mrtg integration\n");
+
+	 exit(EXIT_FAILURE);
+       default:
+         if (isprint (optopt))
+           fprintf (stderr, "Unknown option `-%c'.\n", optopt);
+         else
+           fprintf (stderr,
+                    "Unknown option character `\\x%x'.\n",
+                    optopt);
+         exit(EXIT_FAILURE);
+       }
+
+     if (optind < argc) {
+        fprintf(stderr, "Non-option ARGV-elements, try -h for help.\n");
+        exit(EXIT_FAILURE);
+     }
+
+     if ((lvr_winusb = setup_libusb_access()) == NULL) {
+         exit(EXIT_FAILURE);
+     }
+
+     (void) signal(SIGINT, ex_program);
+
+     ini_control_transfer(lvr_winusb);
+
+     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);
+
+
+
+     do {
+           control_transfer(lvr_winusb, uTemperatura );
+           interrupt_read_temperatura(lvr_winusb, &tempc);
+
+           t = time(NULL);
+           local = localtime(&t);
+
+           if (mrtg) {
+              if (formato==2) {
+                  printf("%.2f\n", (9.0 / 5.0 * tempc + 32.0));
+                  printf("%.2f\n", (9.0 / 5.0 * tempc + 32.0));
+              } else {
+                  printf("%.2f\n", tempc);
+                  printf("%.2f\n", tempc);
+              }
+
+              printf("%02d:%02d\n",
+                          local->tm_hour,
+                          local->tm_min);
+
+              printf("pcsensor\n");
+           } else {
+              printf("%04d/%02d/%02d %02d:%02d:%02d ",
+                          local->tm_year +1900,
+                          local->tm_mon + 1,
+                          local->tm_mday,
+                          local->tm_hour,
+                          local->tm_min,
+                          local->tm_sec);
+
+              if (formato==2) {
+                  printf("Temperature %.2fF\n", (9.0 / 5.0 * tempc + 32.0));
+              } else if (formato==1) {
+                  printf("Temperature %.2fC\n", tempc);
+              } else {
+                  printf("Temperature %.2fF %.2fC\n", (9.0 / 5.0 * tempc + 32.0), tempc);
+              }
+           }
+
+           if (!bsalir)
+              sleep(seconds);
+     } while (!bsalir);
+
+     usb_release_interface(lvr_winusb, INTERFACE1);
+     usb_release_interface(lvr_winusb, INTERFACE2);
+
+     usb_close(lvr_winusb);
+
+     return 0;
+}