Diff: main.cpp

Revision:

0:08aac9dc9662

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Sep 21 23:11:07 2020 +0000
@@ -0,0 +1,43 @@
+/*
+ * DS1820 sensor demo
+ *
+ * Note: Don't forget to connect a 4.7k Ohm resistor 
+ *       between the DS1820's data pin and the +3.3V pin
+ *
+ */
+#include "mbed.h"
+#include "BufferedSerial.h"
+#include "DS1820.h"
+
+
+BufferedSerial pc(PA_9, PA_10);
+
+
+DigitalOut  led(PC_13);   
+DS1820      ds1820(PA_6);    // substitute PA_9 with actual mbed pin name connected to the DS1820 data pin                             
+float       temp = 0;
+
+int main() 
+{                          
+    int  error = 0; 
+    
+    if(ds1820.begin()) {
+        while(1) {
+            ds1820.startConversion();  // start temperature conversion from analog to digital
+            ThisThread::sleep_for(1000);                // let DS1820 complete the temperature conversion 
+            error = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC)
+            switch(error) {
+            case 0:    // no errors -> 'temp' contains the value of measured temperature
+                pc.printf("temp = %3.1f%cC\r\n", temp, 176);
+                break;
+            case 1:    // no sensor present -> 'temp' is not updated
+                pc.printf("no sensor present\n\r");
+                break;
+            case 2:    // CRC error -> 'temp' is not updated
+                pc.printf("CRC error\r\n");
+            } 
+            led = !led;
+        }
+    } else
+        printf("No DS1820 sensor found!\r\n");
+}