Revision 2:4fd07be6bad8, committed 2014-10-19

Comitter:

alipford3

Date:

Sun Oct 19 19:27:19 2014 +0000

Parent:

1:d7568a103ef5

Commit message:

An updated, basic library to interface with the HTU21D temperature and humidity sensor

Changed in this revision

diff -r d7568a103ef5 -r 4fd07be6bad8 HTU21D/HTU21D.cpp
--- a/HTU21D/HTU21D.cpp	Sun Oct 19 18:24:53 2014 +0000
+++ b/HTU21D/HTU21D.cpp	Sun Oct 19 19:27:19 2014 +0000
@@ -1,14 +1,14 @@
 /**
- * @author Alan Lai & Nelson Diaz
- * The Georgia Institute of Technology 
- * ECE 4180 Embeded Systems
+ * @author Alex Lipford
+ * Georgia Institute of Technology 
+ * ECE 4180 Embeded Systems Design
  * Professor Hamblen
- * 03/28/2014
+ * 10/19/2014
  * 
  * @section LICENSE
  * ----------------------------------------------------------------------------
  * "THE BEER-WARE LICENSE" (Revision 42):
- * <alanhlai91@gmail.com> wrote this file. As long as you retain this notice you
+ * <alexlipford@gmail.com> wrote this file. As long as you retain this notice you
  * can do whatever you want with this stuff. If we meet some day, and you think
  * this stuff is worth it, you can buy me a beer in return.
  * ----------------------------------------------------------------------------
@@ -45,11 +45,11 @@
 
     tx[0] = TRIGGER_TEMP_MEASURE; // Triggers a temperature measure by feeding correct opcode.
     i2c_->write((HTU21D_I2C_ADDRESS << 1) & 0xFE, tx, 1);
-    wait_ms(50);
+    wait_ms(50); // Per datasheet, wait long enough for device to sample temperature
     
     // Reads triggered measure
     i2c_->read((HTU21D_I2C_ADDRESS << 1) | 0x01, rx, 2);
-    wait_ms(50);
+    wait_ms(1);
     
     // Algorithm from datasheet to compute temperature.
     unsigned int rawTemperature = ((unsigned int) rx[0] << 8) | (unsigned int) rx[1];
@@ -86,7 +86,7 @@
 
     tx[0] = TRIGGER_HUMD_MEASURE; // Triggers a humidity measure by feeding correct opcode.
     i2c_->write((HTU21D_I2C_ADDRESS << 1) & 0xFE, tx, 1);
-    wait_ms(1);
+    wait_ms(16); // Per datasheet, wait long enough for device to sample humidity
     
     // Reads triggered measure
     i2c_->read((HTU21D_I2C_ADDRESS << 1) | 0x01, rx, 2);

diff -r d7568a103ef5 -r 4fd07be6bad8 HTU21D/HTU21D.h
--- a/HTU21D/HTU21D.h	Sun Oct 19 18:24:53 2014 +0000
+++ b/HTU21D/HTU21D.h	Sun Oct 19 19:27:19 2014 +0000
@@ -1,14 +1,14 @@
 /**
- * @author Alan Lai & Nelson Diaz
- * The Georgia Institute of Technology 
- * ECE 4180 Embeded Systems
+ * @author Alex Lipford
+ * Georgia Institute of Technology 
+ * ECE 4180 Embeded Systems Design
  * Professor Hamblen
- * 03/28/2014
+ * 10/19/2014
  * 
  * @section LICENSE
  * ----------------------------------------------------------------------------
  * "THE BEER-WARE LICENSE" (Revision 42):
- * <alanhlai91@gmail.com> wrote this file. As long as you retain this notice you
+ * <alexlipford@gmail.com> wrote this file. As long as you retain this notice you
  * can do whatever you want with this stuff. If we meet some day, and you think
  * this stuff is worth it, you can buy me a beer in return.
  * ----------------------------------------------------------------------------