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'[EE]Supplier of inexpensive modules and prototype '
2011\01\29@191436 by cdb

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I've just discovered this Chinese company, they seem to specialise in how shall we say, remanufacturing of other companies modules, especially if you are an Arduino fan, or looking for a cheap USB/serial logic analyser ($49.90 is much cheaper than the original $149 - $300 )

Their graphic displays (look original from the pictures) are a pretty decent price.

They appear to have a clone of my favourite humidity/temperature sensor the Sensirion SHT series - called the DT11 they have it for $2.00 but with a totally useless datasheet, nowhere does it tell you how to talk to the sensor.

I might purchase the bamboo tweezers just for the hell of it!

They have a 20% discount offer due to the Chinese holidays. They do warn it can take between 30 and 50 days to receive your goodies though.

http://www.iteadstudio.com

Colin
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cdb,   30/01/2011
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spam_OUTcolinTakeThisOuTspambtech-online.co.uk

2011\01\30@034527 by Geo

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cdb wrote:

> They appear to have a clone of my favourite humidity/temperature sensor the Sensirion SHT series - called the DT11 they have it for $2.00 but with a totally useless datasheet, nowhere does it tell you how to talk to the sensor.

I have not studied their other stuff yet but did buy (from a UK company) a DHT11 last week. Their data sheet is here:-
http://www.nuelectronics.com/download/projects/DHT11.pdf

 Although it measures humidity and temperature, the communication is completely different to the SHT11.
Although the spec says  two bytes for humidity and two for temperature, (whole and fraction), I and others according to Google, have found the second byte is always zero so that you cannot resolve better than one degree C or 1% RH.

George Smit

2011\01\30@040920 by Wouter van Ooijen

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> Although the spec says  two bytes for humidity and two for temperature,
> (whole and fraction), I and others according to Google, have found the
> second byte is always zero so that you cannot resolve better than one
> degree C or 1% RH.

Did you find how the communication is done? The spec you linked is the same useless one which is on iteadstudio's site.

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Wouter van Ooijen

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Van Ooijen Technische Informatica: http://www.voti.nl
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docent Hogeschool van Utrecht: http://www.voti.nl/hvu

2011\01\30@042339 by Geo

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Wouter van Ooijen wrote:

> Did you find how the communication is done? The spec you linked is the same useless one which is on iteadstudio's site.

Sorry - I meant to link to the one at the bottom of this page (which includes Arduino sample code):-
<http://www.dfrobot.com/wiki/index.php?title=DHT11_Temperature_and_Humidity_Sensor_(SKU:_DFR0067)#Document>

If that wraps use:-
http://tinyurl.com/4hv8b27

George Smit

2011\01\30@045820 by Geo

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This would appear to be the original manufacturer's datasheet (AM2303):-

<http://www.aosong.com/english/Upload/PicFiles/20091281822579047.pdf>

George Smit

2011\01\30@050803 by cdb

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:: Did you find how the communication is done?

I've just found this explanation, though the Chinese to English translation is tortuous to say the least.

<hu-tui.com/2010/monobus-sensor-dht11-application-in-the-warm-temper
ature-is-observed-and-controlled/>
Apparently made by the Guangzhou Loose Electronics Company.  
HWSensor.com make a very similar item with a much better communications datasheet

<http://www.hwsensor.com/English/Humidity-Sensor/gas201112884354.shtml>

Colin
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cdb, .....colinKILLspamspam@spam@btech-online.co.uk on 30/01/2011
Web presence: http://www.btech-online.co.uk   Hosted by:  http://www.justhost.com.au
 

2011\01\30@053410 by Geo

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cdb wrote:

> I've just found this explanation, though the Chinese to English translation
> is tortuous to say the least.

Ah - this explains the poor resolution:-

"The data are divided into decimal part and integral part, the decimal part is used for expanding afterwards at present, read out it as zero now."

George Smir

2011\01\30@092418 by jim

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George,

Do you have a sister named Geraldine?
Just curious.

Jim

-----Original Message-----
From: piclist-bouncesspamKILLspammit.edu [.....piclist-bouncesKILLspamspam.....mit.edu] On Behalf Of
Geo
Sent: Sunday, January 30, 2011 2:45 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE]Supplier of inexpensive modules and prototype PCB's

cdb wrote:

> They appear to have a clone of my favourite humidity/temperature sensor the Sensirion SHT series - called the DT11 they have it for $2.00 but with a totally useless datasheet, nowhere does it tell you how to talk to the sensor.

I have not studied their other stuff yet but did buy (from a UK company) a DHT11 last week. Their data sheet is here:-
http://www.nuelectronics.com/download/projects/DHT11.pdf

 Although it measures humidity and temperature, the communication is completely different to the SHT11.
Although the spec says  two bytes for humidity and two for temperature, (whole and fraction), I and others according to Google, have found the second byte is always zero so that you cannot resolve better than one degree C or 1% RH.

George Smit

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