Diff: pH_Sensor.cpp

Revision:

1:1314058dbadb

Child:

2:767f53c397ad

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pH_Sensor.cpp	Sat Dec 05 07:31:02 2015 +0000
@@ -0,0 +1,54 @@
+#include "pH_Sensor.h"
+
+void pH_Sensor::disableContinuousMode() {
+    printf("pH sensor will NOT run in continous mode.\n");
+    if(pH_Serial.writeable() <= 0) printf("Not writable\n");
+    // disable continuous mode
+    pH_Serial.printf("C,0");
+    pH_Serial.printf("%c", '\r');
+    printf("Waiting five seconds... ");
+    wait(5);
+}
+
+void pH_Sensor::setup() {
+    pH_Serial.baud(9600);
+    disableContinuousMode();
+}
+
+// Send default message to pH sensor, asking for data.
+void pH_Sensor::request() {
+    printf("Sending pH request...\n");
+    if(pH_Serial.writeable() <= 0) printf("Not writable\n");
+    // request one reading
+    pH_Serial.printf("R");
+    pH_Serial.printf("%c", '\r');
+}
+
+float pH_Sensor::read() {
+    float pH = 0.0;
+    request();
+    printf("Reading pH information.\n");
+    if (pH_Serial.readable() > 0) {                     //if we see that the Atlas Scientific product has sent a character.
+        string sensorstring = "";
+        printf("Receiving sensor string... [");
+        char inchar;
+        while((inchar = (char)pH_Serial.getc()) != '\r') {
+            sensorstring += inchar;
+            printf("%c", inchar);
+        }
+        printf("] ...sensor string received!\n");
+        printf(sensorstring.c_str());
+        // +1 is to get rid of control character
+        pH = atof(sensorstring.c_str()+1);                      //convert the string to a floating point number so it can be evaluated by the Arduino
+
+        if (pH >= 7.0) {                                  //if the pH is greater than or equal to 7.0
+            printf("high\n");                         //print "high" this is demonstrating that the Arduino is evaluating the pH as a number and not as a string
+        }
+        else {                                //if the pH is less than or equal to 6.999
+            printf("low\n");                          //print "low" this is demonstrating that the Arduino is evaluating the pH as a number and not as a string
+        }
+    } else {
+        printf("pH sensor is not readable\n");
+    }
+    return pH;
+}
\ No newline at end of file