Module/Sensirion SHT75 - Revision history

Martinmm at 21:38, 13 March 2013

2013-03-13T21:38:58Z

← Older revision		Revision as of 15:38, 13 March 2013
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	__NOTOC__		__NOTOC__
	[[Image:Sht75.jpg\|thumb\|right\|SHT75]]		[[Image:Sht75.jpg\|thumb\|right\|SHT75 directly soldered]]
			[[Image:Sht75_breakout_top.jpg\|thumb\|right\|SHT75 breakout board, top]]
			[[Image:Sht75_breakout_bot.jpg\|thumb\|right\|SHT75 breakout board, bottom view]]

	===Overview===		===Overview===

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	===Hardware===		===Hardware===
	The communication happens through an I2C-like communication bus. As it is not exactly I2C the communication is done through dedicated GPIO pins by pulling the pins in software. The SHT75 is sold with four connectors. A 10k pull-up resistor is needed for the data line. There will be an adapter board available in the Paparazzi hardware repository.		The communication happens through an I2C-like communication bus. As it is not exactly I2C the communication is done through dedicated GPIO pins by pulling the pins in software. The SHT75 is sold with four connectors. A 10k pull-up resistor is needed for the data line. There will be an adapter board available in the Paparazzi hardware repository.

			Breakout board: [http://github.com/paparazzi/paparazzi-hardware/tree/master/misc/sht75_small Paparazzi hardware repo]

	Supplier:		Supplier:

Martinmm at 16:52, 5 March 2013

2013-03-05T16:52:21Z

← Older revision		Revision as of 10:52, 5 March 2013
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			Sample log file lines
			7.988 123 SHT_STATUS 26876 25272 45.26 20.91
			8.234 123 SHT_STATUS 26856 25268 45.22 20.9
			8.485 123 SHT_STATUS 26840 25264 45.19 20.89
			8.732 123 SHT_STATUS 26820 25260 45.16 20.88

	===NOTES===		===NOTES===

Martinmm at 16:42, 5 March 2013

2013-03-05T16:42:24Z

@@ Line 3: / Line 3: @@
 ===Overview===
-The Sensirion SHT75 is a digital temperature and humidity sensor. Adaption speed is not perfect but the sensor has proven to work even in very low temperatures. It is the standard humidity sensor for the SUMO.
+The Sensirion SHT75 is a digital temperature and relative humidity sensor. Adaption speed is not perfect but the sensor has proven to work even in very low temperatures. It is the standard humidity sensor for the SUMO.
 [http://www.sensirion.com/en/products/humidity-temperature/humidity-sensor-sht75 SHT75 product homepage]
 ===Hardware===
@@ Line 13: / Line 35: @@
 Supplier:
 [http://uk.farnell.com/sensirion/sht75/sensor-humidity-temp-3-3v/dp/1590514 Farnell]
 [http://www.conrad.de/ce/de/product/503493 Conrad]
 ===Usage===
@@ Line 27: / Line 84: @@
 }}
 The GPIO pins can be configured through defines, for the Umarim lite v2.0 they should be set to P0.13/P0.15 for AUX1/AUX2:
 {{Box Code|conf/airframes/myplane.xml|
 <source lang="xml">
@@ Line 37: / Line 93: @@
      </load>
    </modules>
 </source>
 }}

Martinmm: Sensirion SHT75 humidity/temperature sensor

2013-02-27T20:33:50Z

Sensirion SHT75 humidity/temperature sensor

New page

__NOTOC__
[[Image:Sht75.jpg|thumb|right|SHT75]]
===Overview===

The Sensirion SHT75 is a digital temperature and humidity sensor. Adaption speed is not perfect but the sensor has proven to work even in very low temperatures. It is the standard humidity sensor for the SUMO.

[http://www.sensirion.com/en/products/humidity-temperature/humidity-sensor-sht75 SHT75 product homepage]

module: humid_sht

===Hardware===
The communication happens through an I2C-like communication bus. As it is not exactly I2C the communication is done through dedicated GPIO pins by pulling the pins in software. The SHT75 is sold with four connectors. A 10k pull-up resistor is needed for the data line. There will be an adapter board available in the Paparazzi hardware repository.

Supplier:
[http://uk.farnell.com/sensirion/sht75/sensor-humidity-temp-3-3v/dp/1590514 Farnell]
[http://www.conrad.de/ce/de/product/503493 Conrad]

===Usage===

To use the humidity sensor add:
{{Box Code|conf/airframes/myplane.xml|
<source lang="xml">
<modules>
<load name="humid_sht.xml"/>
</modules>
</source>
}}

The standard GPIO pins for Clock/Data is the ADC1 connector (P0.4/P030) for the Tiny/TWOG. The GPIO pins can be configured through defines, for the Umarim lite v2.0 they should be set to P0.13/P0.15 for AUX1/AUX2:
{{Box Code|conf/airframes/myplane.xml|
<source lang="xml">
<modules>
<load name="humid_sht.xml">
<define name="DAT_PIN" value="15"/>
<define name="SCK_PIN" value="13"/>
</load>
</modules>
</source>
}}

===NOTES===

The location of the sensor on the aircraft does matter. There are various papers that analyze the best location. So far we have installed them within tubes (to protect from sunlight/heating) on the wings. That might not be the optimum place. The SHT75 is preferred over the SHT15 as it does have holes on the back that allows the air to flow through.

[[Category:User_Documentation]] [[Category:Modules]]