Diff: edge_sensor/edge_pressure.cpp

Revision:

0:f0de320e23ac

Child:

3:cac964851bb6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/edge_sensor/edge_pressure.cpp	Fri Dec 01 06:16:31 2017 +0000
@@ -0,0 +1,121 @@
+#include "mbed.h"
+#include "edge_sensor.h"
+#include "edge_time.h"
+#include "PSE530.h"
+#include "edge_pressure.h"
+#include "SO1602A.h"
+
+extern SO1602A *so1602a ; /* OLED display on I2C */
+
+#define LOW_THR   0.2
+#define HIGH_THR  0.3 
+#define MIN_TEMP 12.0
+#define MAX_TEMP 30.0
+
+/**
+ * SMC PSE530 pressure sensor
+ * analog output 1.0V - 5.0V
+ * 1.0V : 0
+ * 5.0V : 1MPa
+ * (at 0.6V : -0.1MPa)
+ * Our sensor I/F converts 0-5V to 0-3V
+ * So we suppose V = Analog Float Value : Pressure
+ * 0.6V = 0.2 : 0
+ * 3.0V = 1.0 : 1MPa
+ */
+ 
+float temp2expected(float temp)
+{
+    const float coef_A = 0.089 ;
+    const float coef_B = 0.831 ;
+    float pressure ;
+
+    pressure = temp * coef_A + coef_B ;
+    return( pressure ) ;
+}
+
+edge_pressure::edge_pressure(PSE530 *pse)
+{
+    _pse = pse ;
+    _value = 0.0 ;
+    _interval = 30 ;
+}
+
+edge_pressure::~edge_pressure(void)
+{
+    if (_pse) {
+        delete _pse ;
+    }
+    _value = 0.0 ;
+}
+
+float edge_pressure::get_value(void)
+{
+    float value = 0.0 ;
+    value = _pse->getPressure() ;
+    return( value ) ;
+}
+
+void edge_pressure::reset(void) 
+{
+    _value = 0.0 ;
+    _sampled_time = 0 ;
+}
+
+void edge_pressure::prepare(void) 
+{
+}
+
+void edge_pressure::sample(void) 
+{
+    _value = get_value() ;
+    _sampled_time = edge_time ;
+}
+
+int edge_pressure::deliver(void) 
+{
+    char str_buf[32] ;
+    int result ;
+    float expected ;
+    print_time(_sampled_time) ;
+    if (current_temp != 0) {
+        sprintf(str_buf, "GAS:%.2f @ %.1fC", _value, *current_temp ) ;
+    } else {
+        sprintf(str_buf, "GAS:%.2f ", _value  ) ;
+    }
+    printf(str_buf) ;
+    if (so1602a != 0) {
+        so1602a->clearDisplay() ;
+        so1602a->locate(0, 0) ;
+        so1602a->putStr(str_buf) ;
+    }
+    if (current_temp != 0) {
+        expected = temp2expected(*current_temp) ;
+        if (_value > (expected + HIGH_THR)) {
+            sprintf(str_buf, "High [exp %.2f]", expected) ;
+        } else if (_value < (expected - LOW_THR)) {
+            sprintf(str_buf, "Low [exp %.2f]", expected) ;
+        } else {
+            sprintf(str_buf, "Normal") ;
+        }
+    }
+    if (so1602a != 0) {
+        so1602a->locate(0, 1) ;
+        so1602a->putStr(str_buf) ;
+    }
+    printf(str_buf) ;
+    printf("\n") ;
+    sprintf(_str_buf,
+       "{\"DEVICE\":\"GAS\",\"PN\":\"PSE530\",\"PRESSURE\":\"%.3f\",\"UNIT\":\"kgf/cm2\",\"S\":\"%06d\",\"E\":\"%d\"}",
+       _value, time2seq(_sampled_time), _error_count) ;
+    result = afero->setAttribute(1, _str_buf) ;
+    return( result == afSUCCESS ) ;
+}
+
+void edge_pressure::recv_config(void)
+{
+}
+
+void edge_pressure::send_config(void)
+{
+}
\ No newline at end of file