Revision 0:755bd47fd6be, committed 2016-09-05

Comitter:

jensstruemper

Date:

Mon Sep 05 10:52:54 2016 +0000

Commit message:

initial commit

Changed in this revision

diff -r 000000000000 -r 755bd47fd6be MLX90614.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MLX90614.cpp	Mon Sep 05 10:52:54 2016 +0000
@@ -0,0 +1,35 @@
+#include "MLX90614.h"
+
+MLX90614::MLX90614(PinName sda, PinName scl)
+{
+    i2c_ = new I2C(sda, scl);
+    i2c_->frequency(400000);
+}
+
+MLX90614::MLX90614(I2C *i2c) : i2c_(i2c) {
+    }
+
+MLX90614::~MLX90614() {
+    delete i2c_;
+    }
+
+float MLX90614::get_temp(uint8_t reg) {
+    char cmd[3] = { 0 };
+    // read the temperature data (kelvin)
+    cmd[0] = ram_access | reg;
+    i2c_->write(default_addr,cmd,1,true); i2c_->read(default_addr,cmd,3);
+    // convert to meaningful units, still in kelvin - just normalized
+    return 0.02 * static_cast<float>((cmd[1]<<8)|cmd[0]);
+}
+
+float MLX90614::read_temp(int select) {
+    uint8_t reg_addrs[] = { T_ambient, T_obj1 };
+    float tt = 0.0;
+    if (select == 0){
+        tt = get_temp(reg_addrs[0])-273.15;
+        }
+    if (select == 1){
+        tt = get_temp(reg_addrs[1])-273.15;
+        }
+    return tt;
+    }

diff -r 000000000000 -r 755bd47fd6be MLX90614.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MLX90614.h	Mon Sep 05 10:52:54 2016 +0000
@@ -0,0 +1,93 @@
+/*
+    Copyright (c) 2016 Jens Strümper based on the work of Jonathan Jones. 
+ 
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+ 
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+ 
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+*/
+
+#ifndef MLX90614_H
+#define MLX90614_H
+
+#ifndef MBED_H
+#include "mbed.h"
+#endif
+
+namespace js {
+    
+/** Due to changes in mbed's I2C stack older implementation of the MLX9064 library do currently not work. 
+ * This recent implementation wraps the example code of Jonathan Jones into a library.  
+ *
+ * The float read_temp(int select) memeber function will take one argument:
+ *  <ul>
+ *  <li> "0" to return ambient temperature </li>
+ *  <li> "1" to retunr object temperature </li> 
+ *  </ul>
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "MLX90614.h"
+ *
+ * I2C i2c(p16, p17); //I2C_SDA, I2C_SCL 
+ * MLX90614 mlx90614(&i2c);
+ *
+ * float temp;
+ * int select; // 0 = object temp, 1 = ambient temp
+ *
+ * int main(){
+    while(true){
+      temp=mlx90614.read_temp(1);
+      printf("%4.2f Celcius\r\n", temp);
+      wait(1);
+    }
+}
+ * @endcode
+ */
+
+class MLX90614 {
+
+public:
+
+    MLX90614(PinName sda, PinName scl);
+
+    MLX90614(I2C *i2c);
+
+   ~MLX90614();
+
+    float read_temp(int select);
+
+protected:
+
+    float get_temp(uint8_t reg);
+
+private:
+
+    I2C *i2c_;
+
+    static const int default_addr = 0x00;
+    static const int T_ambient = 0x06;
+    static const int T_obj1 = 0x07;
+    static const int ram_access = 0x00;
+
+};
+
+} //namespace js
+
+using namespace js;
+
+#endif
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