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Re: [Paparazzi-devel] SHT75 Issues

From: Martin Mueller
Subject: Re: [Paparazzi-devel] SHT75 Issues
Date: Fri, 27 May 2011 23:21:28 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20110424 Lightning/1.0b2 Thunderbird/3.1.10

Hi Christoph,

the SHT75 does not have I2C, it uses some similar proprietary protocol. Use humid_sht_i2c for the true-I2C SHT25 only.

The humid_sht GPIO pins default to the ADC1 connector (see humid_sht.h). You need to add a 10k pull-up if ADC1 is used (or redefine the GPIO pins to use the I2C connector that have pull-ups).


On 27.05.2011 22:25, Christoph Niemann wrote:
Hi everyone,

currently I'm trying to get a SHT75 humidity Sensor to work. No succes
so far. I have used the humid_sht and humid_sht_i2c module. I also tried
it with adding the recommented 10K pullup into the DATA-line. When using
the i2c module, the only value that is send down is 0 for serial1 and
serial2. If I use the humid_sht module the humid is 0.1 and doesn't
change and the temp is -39 deg. Those values also appear, if no SHT is
plugged. Does anyone the SHT with the current git version, or is my SHT
broken (I read they are fragile). If it is broken, wich humdity-sensor
would you use?

Thank you for your help.


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