15-05-2017, 23:50
Hello
it is possible to connect aslo to work?
regards
it is possible to connect aslo to work?
regards
Davis Pro2 Digital Temperature Humidity Sensor (Sensiron SHT31)
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16-05-2017, 09:04
The Davis T/H SHT31 sensor is NOT compatible with the WeatherDuino system.
Davis uses the 'LS' version of the SHT31 sensor with does not support the I2C protocol.
The WeatherDuino system supports the 'DI' version of the SHT31 sensor which uses the I2C protocol.
Davis uses the 'LS' version of the SHT31 sensor with does not support the I2C protocol.
The WeatherDuino system supports the 'DI' version of the SHT31 sensor which uses the I2C protocol.
16-05-2017, 11:49
(16-05-2017, 09:04)MikeM Wrote: The Davis T/H SHT31 sensor is NOT compatible with the WeatherDuino system.
Davis uses the 'LS' version of the SHT31 sensor with does not support the I2C protocol.
The WeatherDuino system supports the 'DI' version of the SHT31 sensor which uses the I2C protocol.
Tnx a lot for information!
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22-05-2017, 19:31
Hi,
You probably can use it on the weatherduino but you need the library for it.
This sensor can co-exist on the same physical wire as an I2C device.
https://github.com/HydroSense/sensirion
Regards, Zapp
You probably can use it on the weatherduino but you need the library for it.
This sensor can co-exist on the same physical wire as an I2C device.
https://github.com/HydroSense/sensirion
Regards, Zapp
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23-05-2017, 02:24
(22-05-2017, 19:31)Zappie Wrote: Hi,
You probably can use it on the weatherduino but you need the library for it.
This sensor can co-exist on the same physical wire as an I2C device.
https://github.com/HydroSense/sensirion
Regards, Zapp
Interesting. So besides the device all one would need is the libraries and nothing else?
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23-05-2017, 03:29
Perhaps not so easy. Surely some changes on the code of the TX software will be needed too.
Why not use just the most common and cheap I2C version of the SHT31 sensor? The sensor is the same.
Why not use just the most common and cheap I2C version of the SHT31 sensor? The sensor is the same.
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23-05-2017, 15:18
(16-05-2017, 09:04)MikeM Wrote: Davis uses the 'LS' version of the SHT31 sensor with does not support the I2C protocol.
Yes, I believe that Davis use the (more expensive) analogue version of the sensor, which would need a dedicated ADC input pin, and of course changes the the Weatherduino software to read it.
Not really a sensible approach; presumably even Davis used it only because it was compatible with their previous hardware?
Cheers, Alan.
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23-05-2017, 17:58
Hi Allan,
The 'LS' version of the SHT31 used by Davis isn't an analogue version. In fact to read it, you can use basically the same routines used to read an SHT1X sensor. This is why Davis as chosen the LS version as it can be used as a replacement for the SHT11 (with a small offset set on the console).
Regards
The 'LS' version of the SHT31 used by Davis isn't an analogue version. In fact to read it, you can use basically the same routines used to read an SHT1X sensor. This is why Davis as chosen the LS version as it can be used as a replacement for the SHT11 (with a small offset set on the console).
Regards
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23-05-2017, 19:30
Hi,
Ah Yes, apologies for giving "bad" information. Apparently the SHT31 is available with an analogue output, but Davis use the -LSS version, although I must admit that I've never heard of the "Legacy Sensibus single shot" bus (and neither has Google or Wikipedia). Is it one of the "I2C-like" buses "invented" by manufacturers that don't like to admit that Philips developed the real I2C bus ?
To save any unnecessary Googling the SHT31 interface options appear to be identified with suffixes :
DIS - Digital I2C single shot
ARP - Analog ratiometric out periodic
LSS - Legacy Sensibus single shot
Cheers, Alan.
Ah Yes, apologies for giving "bad" information. Apparently the SHT31 is available with an analogue output, but Davis use the -LSS version, although I must admit that I've never heard of the "Legacy Sensibus single shot" bus (and neither has Google or Wikipedia). Is it one of the "I2C-like" buses "invented" by manufacturers that don't like to admit that Philips developed the real I2C bus ?
To save any unnecessary Googling the SHT31 interface options appear to be identified with suffixes :
DIS - Digital I2C single shot
ARP - Analog ratiometric out periodic
LSS - Legacy Sensibus single shot
Cheers, Alan.
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