SHT click
SHT click
IC/Module Sensiron SHT3x
(https://www.sensirion.com/products/digital-
humidity-sensors-for-reliable-
measurements/digital-humidity-sensors-for-
various-applications/)
Interface I2C (SCL, SDA), INT, RST
Power
supply
3.3V, 5V
Website www.mikroe.com/click/sht
(http://www.mikroe.com/click/sht)
Schematic also available in PDF (http://cdn-
docs.mikroe.com/images/d/d5/Sht_click_board_sche
SHT click
From MikroElektonika Documentation
SHT click is a temperature and humidity sensing click board that carries Sensiron’s SHT3x IC. Compared to its
redecessor (SHT11), SHT3x click has increased reliability and enhanced signal processing features with a high
signal-to-noise ratio. Best measurement results are achieved within a 5-60º C temperature range (0.015 resolution) and
a 20%–80%RH humidity range (0.01 resolution). SHT click outputs a fully calibrated, linearized, and temperature
compensated digital output through the mikroBUS™ I2C interface (SCL, SDA). An additional INT pin is for setting
up alerts for certain temperature or humidity values. Finally, aN RST pin allows you to reset the sensor. Designed to
use either 3.3V or 5V power supply.
Features and usage notes
SHT click features two onboard jumpers. One for setting the
power supply (soldered to 3.3V by default) and another one for
setting the I2C address.
The SHT3x is a robust and reliable sensor. Even when exposed to
conditions outside its normal range, it has the capability to
recalibrate itself once conditions stabilize. This feature is
expleined on page 4 of the manufacturer's data sheet:
The sensor shows best performance when operated within
recommended normal temperature and humidity range of 5 °C –
60 °C and 20 %RH – 80 %RH, respectively. Long-term exposure
to conditions outside normal range, especially at high humidity,
may temporarily offset the RH signal (e.g. +3%RH after 60h kept
at >80%RH). After returning into the normal temperature and
humidity range the sensor will slowly come back to calibration
state by itself.
Also note that prolonged exposure to extreme conditions may accelerate ageing.
Programming
The following code snippet shows how to send temperature readings from SHT click to a TFT display. The brevity of
the code illustrates the simplicity of implementing SHT3x into your design.
void display_temp()
{
temperature = sht_temp_ss();
Delay_ms( 200 );
sprintf( tmp_txt, "%3.1f C", temperature );
TFT_Rectangle( 195, 95, 250, 120 );
TFT_Write_Text( tmp_txt, 200, 100 );
}
Code examples that demonstrate the usage of SHT click with MikroElektronika hardware, written for mikroC for ARM, AVR, dsPIC, FT90x, PIC and PIC32 are available on
Libstock (http://libstock.mikroe.com/projects/view/1777/sht-click).
Resources
- learn.mikroe.com tutorial about SHT click (http://learn.mikroe.com/leader-humidity-measurement-sht/)
- Sensiron SHT3x page (https://www.sensirion.com/products/digital-humidity-sensors-for-reliable-measurements/digital-humidity-sensors-for-various-applications/)
- Sensiron SHT3x Data Sheet
(https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/Humidity_Sensors/Sensirion_Humidity_Sensors_SHT3x_Datasheet_digital.pdf)
- Sensiron SHT3x Application notes
(https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/Humidity_Sensors/Sensirion_Humidity_Sensors_SHT3x_Application_Note_Alert_Mode
- SHT click examples on Libstock (http://libstock.mikroe.com/projects/view/1777/sht-click)
- mikroBUS standard specifications (http://download.mikroe.com/documents/standards/mikrobus/mikrobus-standard-specification-v200.pdf)
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