emit readings in YAML

Author: Jesse Kempf

Adafruit_DHT_Driver/Adafruit_DHT.c

@@ -62,7 +62,7 @@ int main(int argc, char **argv)
   }
 
 
-  printf("Using pin #%d\n", dhtpin);
+  fprintf(stderr, "Using pin #%d\n", dhtpin);
   readDHT(type, dhtpin);
   return 0;
 
@@ -124,25 +124,46 @@ int readDHT(int type, int pin) {
   }
 #endif
 
-  printf("Data (%d): 0x%x 0x%x 0x%x 0x%x 0x%x\n", j, data[0], data[1], data[2], data[3], data[4]);
+  printf("data:\n");
+  printf(" j: %d\n", j);
+  printf(" d:\n");
+  for (int i = 0; i < 5; i++) {
+    printf("  - %x\n", data[i]);
+  }
 
   if ((j >= 39) &&
       (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) ) {
      // yay!
-     if (type == DHT11)
-        printf("Temp = %d *C, Hum = %d \%\n", data[2], data[0]);
-     if (type == DHT22) {
-        float f, h;
-        h = data[0] * 256 + data[1];
-        h /= 10;
-
-        f = (data[2] & 0x7F)* 256 + data[3];
-        f /= 10.0;
-        if (data[2] & 0x80)  f *= -1;
-        printf("Temp =  %.1f *C, Hum = %.1f \%\n", f, h);
-    }
-    return 1;
-  }
 
+      float therm, humid;
+
+      switch (type) {
+        case DHT11:
+          therm = (float) data[2];
+          humid = (float) data[0];
+          break;
+        case DHT22:
+          humid = (data[0] * 256 + data[1]) / 10.0;
+          therm = ((data[2] & 0x7F)* 256 + data[3]) / 10.0;
+
+          if (data[2] & 0x80) {
+            therm *= -1;
+          }
+
+          break;
+        default:
+          fprintf(stderr, "Unknown device type 0x%x.\n", type);
+          return(1);
+      }
+
+      printf("temperature:\n");
+      printf("  units: C\n");
+      printf("  value: %.1f\n", therm);
+      printf("humidity:\n");
+      printf("  units: pct\n");
+      printf("  value: %.1f\n", humid);
+    } else {
+      return(1);
+    }
   return 0;
 }