Revision 0:d47fb3d4b918, committed 2015-03-31

Comitter:

jimconner

Date:

Tue Mar 31 17:42:18 2015 +0000

Commit message:

Mostly workingish code... the numbers change appropriately when I put weight on the load cell.

Changed in this revision

diff -r 000000000000 -r d47fb3d4b918 hx711.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hx711.cpp	Tue Mar 31 17:42:18 2015 +0000
@@ -0,0 +1,48 @@
+/* mbed library for HX711 Load Cell Amplifier/24-bit A/D converter
+ * Copyright (c) 2015 Jim Conner
+ *
+ * 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.
+ */
+ 
+#include "hx711.h"
+#include "mbed.h"
+
+//#define BPP         16                  // Bits per pixel    
+
+// Constructor         
+HX711::HX711(PinName clk, PinName addo) : clk(clk), addo(addo) 
+{
+
+    
+}
+
+// Destructor
+HX711::~HX711(void) {}
+
+
+// Reading data from the converter
+long HX711::readData(void)
+{
+  unsigned char i;
+  unsigned long Count;
+  clk=0;
+  Count=0;
+  while(addo);
+  for (i=0;i<24;i++) {
+      clk=1;
+      Count=Count<<1;
+      clk=0;
+      if(addo) Count++;
+  }
+  clk=1;
+  Count=Count ^0x800000;
+  clk=0;
+  return(Count);
+}
+

diff -r 000000000000 -r d47fb3d4b918 hx711.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hx711.h	Tue Mar 31 17:42:18 2015 +0000
@@ -0,0 +1,48 @@
+/* mbed library for HX711 Load Cell Amplifier/24-bit A/D converter
+ * Copyright (c) 2015 Jim Conner
+ *
+ * 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.
+ */
+ 
+/** Some stuff to make the load cell work.
+ */ 
+ 
+#include "mbed.h"
+ 
+#ifndef HX711_H
+#define HX711_H
+
+/* some definitiions go in here                                                */
+//#define Black           0x0000      /*   0,   0,   0 */
+
+// Load Cell control class
+ class HX711 
+ {
+ public:
+
+  /** Create an HX711 object connected to Clock and Data pins
+   *
+   * @param clk pin connected to clock line of HX711 board
+   * @param addo pin connected to data line of HX711 board
+   */ 
+  HX711(PinName clk, PinName addo);
+  ~HX711();
+    
+  /** Read data from the HX711 interface
+   * @return reading from ADC as an int.
+   */    
+  long readData(void);
+     
+private:
+  DigitalOut clk; 
+  DigitalIn addo;  
+
+};
+
+#endif