I2C Humidity Sensor - Revision history

Glenn: + Category:Accessories

2010-09-09T15:49:07Z

+ Category:Accessories

Cmair: /* Mounting */

2010-09-07T22:06:59Z

‎Mounting

Cmair: /* Possible mounting places */

2010-08-01T21:59:16Z

‎Possible mounting places

Cmair: mounting

2010-08-01T14:38:24Z

mounting

Cmair: link to sensirion

2010-08-01T14:27:18Z

link to sensirion

Cmair: SHT21 digital humidity sensor

2010-08-01T14:24:51Z

SHT21 digital humidity sensor

New page

The SHT21 is a digital humidity and temperature sensor with a easy to use I2C interface. With just four wires it's rather easy to connect it to your Freerunner. For details see [[I2C]] and [[I2C Pressure Sensor]].

A simple kernel driver is already available from [http://gitorious.org/freerunner-navigation-board/sht21 here].

← Older revision		Revision as of 15:49, 9 September 2010
Line 16:		Line 16:

	I tried the first two options. After drilling small holes both places can be used, but even without top cover I was able to measure a temperature difference of about one degree celsius between the inside and outside of the case.		I tried the first two options. After drilling small holes both places can be used, but even without top cover I was able to measure a temperature difference of about one degree celsius between the inside and outside of the case.
		+
		+	[[Category:Accessories]]

@@ Line 7: / Line 7: @@
 The relative humidity depends on the ambient temperature. This makes it rather difficult to find the best mounting place for the sensor. The requirements are:
 * contact with fresh air
-* minimize errors introduced through external heat from other electronic components.
+* minimize errors introduced through heat from other electronic components.
 ==Possible mounting places==

@@ Line 11: / Line 11: @@
 ==Possible mounting places==
 * next to the GPS antenna
-* inside the GMS antenna
+* inside the GSM antenna
 * behind the speaker holes
 * ...
 I tried the first two options. After drilling small holes both places can be used, but even without top cover I was able to measure a temperature difference of about one degree celsius between the inside and outside of the case.

← Older revision		Revision as of 14:38, 1 August 2010
Line 1:		Line 1:
−	The [http://www.sensirion.com/de/01_humidity_sensors/05_humidity_sensor_sht21/00_humidity_sensor_sht21.htm SHT21] from Sensirion is a digital humidity and temperature sensor with a easy to use I2C interface. it connects to your Freerunner just like the [[I2C Pressure Sensor]].	+	=General description=
		+	The [http://www.sensirion.com/de/01_humidity_sensors/05_humidity_sensor_sht21/00_humidity_sensor_sht21.htm SHT21] from Sensirion is a digital humidity and temperature sensor with a easy to use I2C interface. It connects to your Freerunner just like the [[I2C Pressure Sensor]].

	A simple kernel driver is already available from [http://gitorious.org/freerunner-navigation-board/sht21 here].		A simple kernel driver is already available from [http://gitorious.org/freerunner-navigation-board/sht21 here].
		+
		+	=Mounting=
		+	The relative humidity depends on the ambient temperature. This makes it rather difficult to find the best mounting place for the sensor. The requirements are:
		+	* contact with fresh air
		+	* minimize errors introduced through external heat from other electronic components.
		+
		+	==Possible mounting places==
		+	* next to the GPS antenna
		+	* inside the GMS antenna
		+	* behind the speaker holes
		+	* ...
		+
		+	I tried the first two options. After drilling small holes both places can be used, but even without top cover I was able to measure a temperature difference of about one degree celsius between the inside and outside of the case.

← Older revision		Revision as of 14:27, 1 August 2010
Line 1:		Line 1:
−	The SHT21 is a digital humidity and temperature sensor with a easy to use I2C interface. ~~With just four wires it's rather easy to connect~~ it to your Freerunner~~. For details see [[I2C]] and~~ [[I2C Pressure Sensor]].	+	The [http://www.sensirion.com/de/01_humidity_sensors/05_humidity_sensor_sht21/00_humidity_sensor_sht21.htm SHT21] from Sensirion is a digital humidity and temperature sensor with a easy to use I2C interface. it connects to your Freerunner just like the [[I2C Pressure Sensor]].

	A simple kernel driver is already available from [http://gitorious.org/freerunner-navigation-board/sht21 here].		A simple kernel driver is already available from [http://gitorious.org/freerunner-navigation-board/sht21 here].