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Author Topic: Sensitron SHT15 and SHT75, what is the difference?  (Read 1729 times)
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Hello,

I've been using a SHT15 that recently failed and I am thinking of getting a SHT75 since it appears to more robust and comes on a nice breakout board (also the SHT15s are sold out).

I was using tht SHT15 library from http://github.com/practicalarduino/SHT1x, can I use exactly the same code with the SHT75?

Thanks,
Jacob
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Looks like the SHT21 will be available here soon: http://misenso.com/2010/05/arduino-humidity-sensor-sht21/  I emailed and was told next week :-)
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Is the only difference between the 21 and 15 the size of the sensor?
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I think its more than just size :-)  Energy consumption is much lower for sure.

This is what they say:

SHT21, the new humidity and temperature sensor of
Sensirion is about to set new standards in terms of size
and intelligence: Embedded in a reflow solderable Dual
Flat No leads (DFN) package of 3 x 3mm foot print and
1.1mm height it provides calibrated, linearized signals in
digital, true I2C format.
With a completely new designed CMOSens® chip, a
reworked capacitive type humidity sensor and an
improved band gap temperature sensor the performance
has been lifted even beyond the outstanding level of the
previous sensor generation (SHT1x and SHT7x). For
example, measures have been taken to stabilize the
behavior at high humidity levels.
Every sensor is individually calibrated and tested. Lot
identification is printed on the sensor and an electronic
identification code is stored on the chip – which can be
read out by command. Furthermore, the resolution of
SHT21 can be changed by command (8/12bit up to
12/14bit for RH/T), low battery can be detected and a
checksum helps to improve communication reliability.
With made improvements and the miniaturization of the
sensor the performance-to-price ratio has been improved
– and eventually, any device should benefit from the
cutting edge energy saving operation mode. For testing
SHT21 a new evaluation Kit EK-H4 is available.

SHT15
Energy consumption: 80uW (at 12bit, 3V, 1 measurement / s)  
RH operating range: 0 – 100% RH
T operating range: -40 – +125°C (-40 – +257°F)
RH response time: 8 sec (tau63%)
Output: digital (2-wire interface)

SHT21
Energy consumption: 3.2uW (at 8 bit, 1 measurement / s)
RH operating range: 0 – 100% RH
T operating range: -40 – +125°C (-40 – +257°F)
RH response time: 8 sec (tau63%)
Output: I2C digital, PWM and SDM/analog Volt interface
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