Kevin Gillepsie / Si7020

Device driver for Si7020 Digital humidity and temperature sensor.

Dependents:   Si7020_example MAXWSNENV_sensors MAXWSNENV_sensors Hello-Uzuki-sensor-shield ... more

Si7020 Device Driver

This is a device driver for the Si7020 Humidity and temperature sensor. It uses I2C to communicate humidity and temperature data.

Si7020 Product Page

180

Diff: Si7020.cpp

Revision:
1:eca9d19c17ab
Parent:
0:9a1febb56203
--- a/Si7020.cpp	Fri Apr 17 09:53:45 2015 -0500
+++ b/Si7020.cpp	Fri Apr 17 11:25:00 2015 -0500
@@ -252,7 +252,7 @@
 
     // Calculate the temperature using the formula from the datasheet
     // Scaled by 100
-    *tempC = (((float)175.72 * code) / 65536) - 46.85;
+    *tempC = ((175.72f * (float)code) / 65536.0f) - 46.85f;
 
     return 0;
 }
@@ -328,7 +328,7 @@
     code = ((uint16_t)data[0] << 8) + data[1];
 
     // Calculate the humidity using the formula from the datasheet
-    *humid = (((float)125 * code) / 65536) - 6;
+    *humid = ((125.0f * (float)code) / 65536.0f) - 6.0f;
 
     return 0;
 }