06-06-2016, 05:10
Since some months that I'm testing the HTU21 from Measurement Specialties, for outside use.
I have to say that I'm quite impressed with its performance.
I installed a SHT21 and an HTU21 on the same radiation shield, and most of the times that I check the readings, both give almost the same values for the temperature, with very small differences on the humidity readings. Considering the super low cost of the HTU21 (around 3€ in China) it may be a very interesting alternative.
Both sensors are read through the I2C protocol, so long cables should be avoid, but despite of this, I manage to get stable readings from the HTU21 with a 3 meters two par twisted cable.
Some sources, refer that reading from the HTU21 is faster than from the SHT21, which is not very important for the WeatherDuino Pro2 system.
![[Image: s-l225.jpg]](http://thumbs.ebaystatic.com/images/g/y5EAAOSwDNdVkRNn/s-l225.jpg)
I have to say that I'm quite impressed with its performance.
I installed a SHT21 and an HTU21 on the same radiation shield, and most of the times that I check the readings, both give almost the same values for the temperature, with very small differences on the humidity readings. Considering the super low cost of the HTU21 (around 3€ in China) it may be a very interesting alternative.
Both sensors are read through the I2C protocol, so long cables should be avoid, but despite of this, I manage to get stable readings from the HTU21 with a 3 meters two par twisted cable.
Some sources, refer that reading from the HTU21 is faster than from the SHT21, which is not very important for the WeatherDuino Pro2 system.