Dr. Pucher / LM75B

Bulme lib for temp sensor LM75B

Dependents:   mbed-os-example-wifi-ThingSpeak mbed_freeRTOS_send STM_Statemachine

Files at this revision

API Documentation at this revision

Revision 0:29546bb2c7dd, committed 2016-03-14

Comitter:
bulmecisco
Date:
Mon Mar 14 13:23:07 2016 +0000
Commit message:
Bulme Lib for temp sensor LM75B;

Changed in this revision

LM75B.cpp Show annotated file Show diff for this revision Revisions of this file
LM75B.h Show annotated file Show diff for this revision Revisions of this file 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LM75B.cpp	Mon Mar 14 13:23:07 2016 +0000
@@ -0,0 +1,19 @@
+#include "LM75B.h"
+
+LM75B :: LM75B(PinName sda, PinName scl) : i2c(sda, scl)
+{
+    cmd[0] = LM75B_CONF;            // Pointerregister
+    cmd[1] = 0x0;                   // Default siehe 7.4.2 Tabelle 8
+    i2c.write(LM75B_ADDR, cmd, 2);  // Adr., char *, Länge   
+}
+
+float LM75B :: read()
+{
+    cmd[0] = LM75B_TEMP;
+    
+    i2c.write(LM75B_ADDR, cmd, 1);  // sende Temperatur Befehl
+    i2c.read(LM75B_ADDR, cmd, 2);   // bekommmen den command string
+    return (float ((cmd[0] << 8) | cmd[1])/256.0);    
+}
+
+LM75B :: ~LM75B() {}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LM75B.h	Mon Mar 14 13:23:07 2016 +0000
@@ -0,0 +1,24 @@
+#ifndef LM75B_H
+#define LM75B_H
+
+#include "mbed.h"
+
+// LM75B Adresse
+#define LM75B_ADDR 0x90
+
+// LM75B Register
+#define LM75B_CONF 0x01
+#define LM75B_TEMP 0x00
+
+class LM75B
+{
+public:
+  LM75B(PinName sda, PinName scl);  // I2C Pins übergeben p28, p27
+  ~LM75B();
+  float read(); 
+  
+private:
+  char cmd[2];
+  I2C i2c;
+};
+#endif
\ No newline at end of file