Revision 4:2c46c3bc8032, committed 2016-07-27

Comitter:

joeata2wh

Date:

Wed Jul 27 19:42:41 2016 +0000

Parent:

3:47148198f5f2

Child:

5:4b66dfbc52a5

Commit message:

working version

Changed in this revision

--- a/Adafruit_GFX.lib	Wed Mar 30 14:49:21 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://developer.mbed.org/users/nkhorman/code/Adafruit_GFX/#7fb1d4d3525d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SHT75.lib	Wed Jul 27 19:42:41 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/nimbusgb/code/SHT75/#db6b417dfa74

--- a/SSD1308_128x64_I2C.lib	Wed Mar 30 14:49:21 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://mbed.org/users/wim/code/SSD1308_128x64_I2C/#df92b0c0cb92

--- a/main.cpp	Wed Mar 30 14:49:21 2016 +0000
+++ b/main.cpp	Wed Jul 27 19:42:41 2016 +0000
@@ -1,153 +1,57 @@
-/* Example of Reading all the ADC pins PIN and display ot OLED display using
- Nucleo_F303K8. Displays voltage read from first 2 ADC lines on OLED display
+/* Test ability to read SHT75 sensor 
+  Note:  Can not be on same pins as I2C due to different pull up 
+  requirements.
 
   By Joseph Ellsworth CTO of A2WH
   Take a look at A2WH.com Producing Water from Air using Solar Energy
-  March-2016 License: https://developer.mbed.org/handbook/MIT-Licence 
+  March-2016 License: https://developer.mbed.org/handbook/MIT-Licence
   Please contact us http://a2wh.com for help with custom design projects.
 
+  See Also: https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/Humidity_Sensors/Sensirion_Humidity_Sensors_SHT7x_Datasheet_V5.pdf
   
-  Used to Drive:
-   ebay part http://www.ebay.com/itm/152000005331?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
-  0-96-I2C-IIC-SPI-Serial-White-OLED-LCD-LED-Display-Module-128X64
-  The Datasheet.  https://www.adafruit.com/datasheets/SSD1306.pdf
-
-  Unfortunately this part never turns on using the SSD1308 library.
-  but did find that the https://developer.mbed.org/users/nkhorman/code/Adafruit_GFX/
-  library works.  Unfortunately the Adafruit library doesn't include the scroll functionality.
-
-  Using my I2C address scanner I found that it responds on Added 120 (x78) ,121 (x79)
-  and when the part was unsoldered nothing responded on 120 or 121. According to
-  to the page #19 (8.1.5) of the data sheet the I2C address should be 011110
-  which seems to map correctly to dec=120 hex=79
-
  */
 
 #include "mbed.h"
-//#include "SSD1308.h"
-#include "Adafruit_SSD1306.h"
-
-//#include "mbed_logo.h"
+#include <stdint.h>
 
-//Pin Defines for I2C Bus
-#define D_SDA                  PB_7 // specific for Nucleo-F303K8
-#define D_SCL                  PB_6 // specific for Nucleo-F303K8
-I2C i2c(D_SDA, D_SCL);
+#define sht75_clk D0
+#define sht75_data D1
+#include "sht7X.h" 
+SHT75 sht(sht75_clk, sht75_data); 
+ 
 
 // Host PC Communication channels
 Serial pc(USBTX, USBRX); // tx, rx
-
-AnalogIn   pa0(PA_0);
-AnalogIn   pa1(PA_1);
-PwmOut  fan1(D11);
-//PwmOut  fan2(D12);
-//PwmOut  fan3(PA_2);
-DigitalOut fan2x(D12);
+char buff[100];
 
 DigitalOut myled(LED1);
-const float voltMeterARef = 3.3;
-
-// an I2C sub-class that provides a constructed default
-class I2CPreInit : public I2C
-{
-public:
-    I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl) {
-        frequency(400000);
-        start();
-    };
-};
-
-
-I2CPreInit gI2C(D_SDA,D_SCL);
-Adafruit_SSD1306_I2c gOled2(gI2C,PB_5);
-
-
-float readPrint(AnalogIn ain, char *label)
-{
-    float tval = ain.read();
-    float volts = tval * voltMeterARef;
-    float perc = tval * 100.0f;
-    unsigned short  tvalu16 = ain.read_u16 ();
-    pc.printf("adc %s R=%3.3f V=%3.3f U16=%u\r\n",label, tval, volts, tvalu16);
-    gOled2.printf("%s=%3.3fV\r\n",label,volts);
-    gOled2.display();
-    return tval;
-}
-
 
 int main()
 {
-    pc.baud(9600);
-    // Display with the Adafruit Library
-    gOled2.printf("%ux%u OLED Display\r\n", gOled2.width(), gOled2.height());
-    wait(5);
-    gOled2.clearDisplay();
+    pc.baud(38400);
+    wait(1);
     while(1) {
         myled = !myled;
-        gOled2.clearDisplay();
-        gOled2.setTextCursor(1,1);
-        readPrint(pa0, "PA_0");
-        wait(0.1);
-        gOled2.setTextCursor(1,10);
-        readPrint(pa1, "PA_1");
-        
-         float pwmpw = 0.3; //0.0005; //0.09; // 0.1001;
-         float pwmpp = 3.0; //0.00001; //0.0001; // 0.01001;
-         //fan2.period_ms();
-         //fan2.pulsewidth_ms(200);
-         
-         //float pwmpw = 0.1; //0.0005; //0.09; // 0.1001;
-         //float pwmpp = 1.0; //0.00001; //0.0001; // 0.01001;
-        //fan2.pulsewidth(0.1);
-        //fan2.period(1.0  / 10.0);
-        //fan2.pulsewidth(2.0);
-        //fan2.period(20);
-        float pwmduty = 0.1f;
-        float unit_time = 10.0;                  
-        float total_period = 0.1; //0.7; //3.5; //0.8;
-        float num_cycle = (unit_time / total_period) + 1;
+        float temperature;                    // temperature -40 to 120 deg C
+        float humidity;                       // relative humidity 1% to 100%
+        float humi_f,rh_lin,rh_true;          // working registers for Illustration purposes
+        int t;                                // temporary store for the temp ticks
+        int h;
+        sht.softReset();        
+        int stat = sht.readStatus();
+        wait(3.0);
+        sht.readTempTicks(&t);
+        temperature = ((float)(t) * 0.01) - 39.61;
 
-        while (pwmduty <= 1.1f) {
-            float on_time = total_period * pwmduty;
-            float off_time = total_period - on_time;
-            //gOled2.clearDisplay();
-            gOled2.setTextCursor(1,20);
-            wait(0.1);
-            gOled2.printf("pwm=%3.3f\r\n", pwmduty);            
-            wait(0.1);
-            gOled2.display();
-            wait(0.1);
-            gOled2.display();
-            wait(0.1);
-            pc.printf("pwm=%3.3f\r\n", pwmduty);            
-            //wait(3.0);
-            fan2x = 1;
-            wait(0.15);
-            for (int x=0; x<= num_cycle; x++) {
-            
-            fan2x = 1;
-            wait(on_time);
-            fan2x = 0;
-            wait(off_time);
-            // accelerate to get the motor turning
-            // then slow down to the current speed;
-            //fan1 = 0.0;
-            //fan2 = 0.0;
-            //fan3 = 0.0;
-            //wait(0.02);
-            //fan1 = pwmduty;
-            //fan2 = pwmduty;
-            //fan3 = pwmduty;
-            //fan2 = pwmduty;
-            //fan2.period(pwmduty/100);
-            //fan2.period(pwmduty);
-            
-            }
-            pwmduty+= 0.1f;
-        }        
-        //fan1 = 0.0;
-        //fan2 = 0.0;
-        //fan3 = 0.0;
+        sht.readHumidityTicks(&h);
+        humi_f = (float)(h);
+        rh_lin = C3 * humi_f * humi_f + C2 * humi_f + C1;
+        rh_true=(((temperature/100)-25)*(T1+T2*humi_f)+rh_lin);
+        if(rh_true>100)rh_true=100;                             //cut if the value is outside
+        if(rh_true<1)rh_true=1;                                 //the physical possible range
+        humidity = rh_true;
+        pc.printf("stat=%d Temp: %2.2f RH %2.2f\n\r",stat, temperature, humidity);
+        
         wait(3.0);
     }
-}
+}
\ No newline at end of file