SparkFun Electronics - Humidity and Temperature Sensor

Products

Product Info

Humidity and Temperature Sensor - SHT15 Breakout

sku: SEN-08257

Description: This is a simple breakout board for the SHT15 humidity sensor from Sensirion. The SHT15 digital humidity and temperature sensor is fully calibrated and offers high precision and excellent long-term stability at low cost. The digital CMOSens Technology integrates two sensors and readout circuitry on one single chip.

These sensors are really impressive! Very sensitive and straight forward to use. Board comes assembled and tested with the SHT15.

Features:

2 factory calibrated sensors for relative humidity & temperature
Digital 2-wire interface
Precise dewpoint calculation possible
Measurement range: 0-100% RH
Absolute RH accuracy: +/- 2% RH (10...90% RH)
Repeatability RH: +/- 0.1% RH
Temp. accuracy: +/- 0.3°C @ 25°C
Fast response time < 4 sec.
Low power consumption (typ. 30 µW)
Low cost
High precision sensor at low cost
Leading CMOSens Technology for superior long-term stability

Applications:

Precise data logging
Transmitters
Automation & process control
Building control and HVAC
Test & Measurement
Medical

Documents:

Pricing

	136 in stock backorder allowed

$41.95	price
$37.76	10-99 (10% off)
$33.56	100+ (20% off)

	quantity

click on image to enlarge

Comments

7 comments

Log in to post comments.

reza

+3.3

| February 28, 2007 at 4:58 AM

Or, get the most sensitive sensor they make - ST75 I think - which has leads metric spaced leads (1.27mm) already attached for $32ish a pop from newark. Just got 10 myself for a discount plus used some 10% off coupon code.

The thing works great, though the temp reading takes longer than the humidity - and I really dont know what I need 14 bits of precision for something that's only +/- 1.8% accurate.

They also give you a non-linear curve fit equation and another one that does temperature compensation for humidity. Very sensitive - i can blow on it from 5 feet away and it notices.

	by Justin Hammond +1.9 \| January 27, 2009 at 10:01 PM 0
Everyone should take note, even though its advertised as a 2 wire, or i2c interface, its not 100% compatible... but once you work around the differences, its a dream to work with

Silverman

+1.5

| July 21, 2009 at 10:29 AM

The boards that are shipping now don't match the photo or the schematic. They're red instead of green, which is awesome, but the resistors marked "not populated" are now populated. I had a frustrating time figuring out that the pull-down resistor on SCK was sinking enough of my clock that the sensor itself was ignoring it.

So test the board in your circuit before you install it in a way that blocks those resistors from being removed.

Also, I recommend Mouser 651-1725672 as a really tidy connector that solders directly onto this board. It dwarfs the sensor, but if you're running a cable to the sensor mounted inside an enclosure, it's nice to have screw terminals.

	by BT +15 \| August 18, 2009 at 12:23 AM 0
It'd be nice to have an updated set of pdf's for this part. Also a dimensional drawing showing hole placement.

	by JerryG +1.4 \| September 13, 2009 at 9:24 PM 0
Sparkfun may want to consider changing the 10K pull-up resistor on the data line to something like 4.7K or 2.2K instead. The current 10K pull-ups cause quite a bit of slew on the data line and limit speed. I'd prefer the trade-off of added current draw when transmitting on the bus over the lower data rate possible with higher value pull-ups.

	by Jimby +1 \| December 18, 2009 at 4:42 PM 0
Scuse my ignorance but I'm only just starting to play around with I2C but on this board R1 goes to VCC and R2 goes to GND. I thought that both resistores on I2C were pull-up, wired to VCC. Does anyone know the reason for it on this board.

	by tz +2.3 \| December 20, 2009 at 6:50 PM 0
This is NOT I2C, but 80% of it. Mainly the sensor pulls down SDA to indicate conversion complete. An existing bitbang (or something like the USI assist on the ATtinyx5) can be easily adapted to talk to this.