Diff: main.cpp

Revision:

0:6367a3d990f2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Apr 19 04:10:42 2018 +0000
@@ -0,0 +1,62 @@
+#include "mbed.h"
+#include "DS1820.h"
+
+#define SLEEP_S 2
+
+// I'm using DS18B20, connections
+// red -> 5v
+// blue -> GND
+// yellow -> D6
+DigitalOut led_r(LED1);
+DigitalOut led_g(LED2);
+DigitalOut led_b(LED3);
+DS1820 temp_probe(D6);
+
+//we will use the first read as environment temperature
+float env_temperature = -99;
+// red means higher than environment
+// blue means cooler than environment
+// green means same as env
+
+float read_temperature() {
+    float tmp_temp;
+    temp_probe.convertTemperature(true, DS1820::this_device);
+    do {
+        // TODO limit the n of tries
+        // if device is not responding, will cycle forever
+        tmp_temp = temp_probe.temperature();
+        wait_ms(10);
+    } while(tmp_temp == -1000);
+    return tmp_temp;
+}
+
+int main() {
+    printf("Temperature probe test\r\n");
+    float temperature = 0;
+    temp_probe.setResolution(9); //9bits
+    
+    //read env temperature
+    wait(1); //wait for device to be ready
+    env_temperature = read_temperature();
+    
+    while(1) {
+        temperature = read_temperature();
+        printf("Temperature %3.1foC\r\n", temperature);
+        if(temperature < env_temperature) {
+            led_r = 1; // 1 is off in this board
+            led_g = 1;
+            led_b = 0;
+        } else if(temperature > env_temperature) {
+            led_r = 0;
+            led_g = 1;
+            led_b = 1;
+        } else {
+            led_r = 1;
+            led_g = 0;
+            led_b = 1;
+        }
+        // sleep
+        wait(SLEEP_S);
+    }
+}
+