Home Code Raspberry Pi and SHTC1 digital humidity sensor example

Raspberry Pi and SHTC1 digital humidity sensor example

by shedboy71

In this article we look at another digital humidity sensor – this time its the SHTC1 and we will connect it to a raspberry Pi

Sensor Information

The SHTC1 is a digital humidity sensor designed especially for high-volume consumer electronics applications. This humidity sensor is strictly designed to overcome conventional limits for size, power consumption, and price-performance ratio, in order to fulfill the current and future requirements of the consumer electronics market.

Sensirion’s CMOSens® technology offers a complete sensor system on a single chip, consisting of a capacitive humidity sensor, a band-gap temperature sensor, analog and digital signal processing, A/D converter, calibration data memory, and a digital communication interface supporting I2C fast mode.

The ultra-small, 2 × 2 × 0.75 mm3 DFN package enables applications to be placed in even the most limited of spaces. The sensor covers a humidity measurement range of 0 to 100 %RH and a temperature measurement range of –30°C to 100°C with a typical accuracy of ±3 %RH and ±0.3°C.

The operating voltage of 1.8 V and an energy budget below 1 µJ per measurement make the SHTC1 suitable for mobile or wireless applications running on the lowest power budgets. With the industry-proven quality and reliability of Sensirion’s humidity sensors and constant accuracy over a large measurement range, the SHTC1 humidity sensor offers an unprecedented price-performance ratio.


Interface I²C
Supply voltage 1.8 V
Power consumption 2µW (at 1 reading per second in low power mode)
Measuring range (RH) 0 – 100% relative humidity
Measuring range (T) -30 to +100°C (-22 to +212°F)
Response time (RH) 8s (tau63%)

Parts Required

Here are the parts required to build this, there are various links you can choose from – I personally buy from Aliexpress as it is usually cheaper but you will probably have to wait 3+ weeks

Name Link
Raspberry Pi Aliexpress product link

Amazon. com link

Ebay search

SHTC1 AliExpress Product linkAmazon link

Ebay link

Dupont Connecting wire Aliexpress product link

Amazon.com link

Ebay link


Raspberry Pi Sensor
3v3 Vcc
Gnd Gnd



Enable I2C on Your Raspberry Pi

[codesyntax lang=”bash”]

$ sudo raspi-config
$ sudo reboot
$ ls -l /sys/bus/i2c/devices
# This should output: i2c-1


If you want to verify that the sensor is wired run i2cdetect -y 1 0x70 0x77. If everything is fine, you should see it listed at address 0x70

Now you need to load the SHTC1 driver

[codesyntax lang=”bash”]

$ sudo modprobe shtc1
$ echo shtc1 0x70 | sudo tee /sys/bus/i2c/devices/i2c-1/new_device
$ ls /sys/bus/i2c/devices/1-0070/


To read the current temperature:

[codesyntax lang=”bash”]

$ cat /sys/bus/i2c/devices/1-0070/hwmon/hwmon1/temp1_input


…and the relative humidity:

$ cat /sys/bus/i2c/devices/1-0070/hwmon/hwmon1/humidity1_input


You can see this in the following screen capture






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