Revision 0:c622220fe79d, committed 2016-03-14

Comitter:

fritzhausmann

Date:

Mon Mar 14 13:30:16 2016 +0000

Commit message:

Bulme library for LM75B temp. sensor

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LM75B.cpp	Mon Mar 14 13:30:16 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() {}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LM75B.h	Mon Mar 14 13:30:16 2016 +0000
@@ -0,0 +1,23 @@
+#include "mbed.h"
+#ifndef LM75B_H
+#define LM75B_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