LaskaKit SHT40 Air temperature and humidity sensor

Product detailed description

Choosing a good and preferably cheap temperature sensor is not easy. We want quality and a reasonable price at the same time. Based on these requirements, a module for measuring temperature and humidity was developed. On the board you will find the SHT40 sensor from the company Sensirion in the DFN4 case, pull-up resistors and a blocking capacitor.

Thanks to a specially designed plate, the sensor part can be broken off and used for installation in the sensor housing or any other suitable housing. After breaking, there are no more pullup resistors on the ^I2Cboard and it is necessary that the device to which the sensor will be connected has them.

ATTENTION! We recommend that you refresh the sensor before the first start-up to remove any contamination and ensure that the sensor measures within the specified parameters. Refresh consists in starting the internal heating of the sensor to a temperature of approx. 120°C for approx. 90 min until the measured humidity value drops to approx. 5% RH. It is better to do this procedure in a room with a humidity of about 50%RH and a temperature of about 23°C. Depending on the temperature and humidity in the room, the treatment time may vary. For this purpose, we have created a program for Arduino, which incorporates the switching of the internal heating and the simultaneous measurement of the current humidity value. When the measured humidity drops to 5%RH, the cycle stops and switches to the standard measurement. The real values are then available after the sensor has cooled down to ambient temperature.

This procedure can be used even if the sensor stops measuring the correct values over time.

Specifications:

• Power: 1.1-3.6V DC - typically 3.3V DC
• Resolution: 16bit
• Temperature measurement range: -40-125°C
• Temperature measurement resolution: 0.01°C
• Temperature measurement accuracy: ±0.2°C
• Humidity measurement range: 0-100% RH
• Humidity measurement resolution: 0.01 RH
• Humidity measurement accuracy: ±1.8% RH
• Dimensions: 17x12mm

Included in delivery:

• 1pc LaskaKit SHT40 Air temperature and humidity sensor
• 1pc pin bar

Remark:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustration purposes only and may sometimes differ from the actual appearance of the item. However, this does not change its basic properties.
• Outdoor case not included
• When used outdoors, we recommend spraying with PLASTIK 70, WARNING! the varnish must not get on the sensor itself, tape it over before spraying.