Innovative Sensor Technology HYT 271 Humidity Sensor Module User Guide

Innovative Sensor Technology HYT 271 Humidity Sensor Module

Specifications

• Product: 4-Channel Evaluation board for digital humidity modules
• Compatible Modules: HYT 271, HYT 221, HYT 939
• Connections: Up to 4 modules simultaneously
• Power Supply: USB cable or DC power source (5V, 4-15V DC)
• Operating Systems: Windows 7/8/8.1/10/11

Product Usage Instructions

Evaluation Board Connections
The board allows the connection of up to 4 sensors simultaneously, with specific connectors for each module type. Connect the USB Dongle to the Evaluation Board following the WHITE and RED color markings. Then connect the USB Dongle to your PC.

Compatibility
The evaluation board is compatible with all IST AG humidity modules of the HYT family including HYT 271, HYT 221, and HYT 939.

Power Supply and Outputs
The transmitter can be powered via a USB cable from a PC or a DC power source (5V, 4-15V DC). Refer to schematics for connector positions.

**Signal Transmission

**

Analog Output: The analog voltage signals transmitted are directly proportional to the measured parameters (Relative humidity and Temperature).

Software Installation
Compatible with Windows operating systems. Ensure the iowkit.dll file is in the same directory as the executable file for proper software functioning.

Assembly of Sensors
Each sensor occupies a shared slot on the board. Ensure proper matching of sensor type with connector shape. Assemble sensors according to their shape and connector type.
The purpose of this evaluation board is to facilitate the evaluation of HYT sensor modules for humidity and temperature. The evaluation board enables to connect up to 4 HYT modules simultaneously.

Evaluation board connections

• Though the humidity evaluation board has 8 connectors, a maximum of 4 sensors can be used at a time (See Section 4 for details).
• The square-shaped connectors are for HYT 221, HYT 271, and HYTR411 modules. The round connectors are for HYT 939 modules. The pinning of each sensor is displayed on the board.
• To power the board, connect the USB Dongle to the Evaluation Board according to the “WHITE” and “RED” color markings. Then connect the USB Dongle to your PC.

Compatibility

The evaluation board is compatible with all IST AG humidity modules of the HYT family

Power supply and outputs

The transmitter can be powered via a USB cable from a PC or a DC power source. Please refer to Schematics (1.1) for the position of the corresponding connectors.

Power supply requirements

Signal transmission

Analog output

• The analog voltage signals transmitted are directly proportional to the measured parameters.
• The following measuring and signal ranges represent the default HYT calibration:

Software installation

Assembly of sensors

Only one sensor can occupy a shared sensor slot (Ex: the Square connector of “Sensor 1” has a HYT271 connected, so the round connector of “Sensor 1” is considered occupied). When assembling the HYT 939, make sure the shape of the sensor housing nose also matches the shape of the circle-shaped connector. Assemble the flat chip sensors into the square connectors facing up.

See example of assembling the sensors on the Evaluation Board below

Using the software

Steps to read sensor data:

1. Click “Scan I2C Bus” under the Interface section to ensure that the Evaluation Board can be found by the software.

2. On the settings section, select the appropriate sensor settings that correspond to how you have assembled the sensors on the Evaluation Board. Change the cycle time if needed. To apply the settings, click “Write”. To read the previously applied settings, click “Read”.
   Note: When using HYT 221/271/R411, select sensor type “HYT271”.

3. To begin reading the sensor data, click “Read” located under the Interface section. To stop the reading, click “Stop Read

Changing Address Module

1. Assemble the sensor that you desire to change the address in Sensor slot #1.
2. Under the “Change Address” section, type the new decimal address in the “New Address” box.
3. Finally, click “Set Address” to set the new desired address.

Data Acquisition / Logging:

1. Under the Log section, click “Set Log”.
2. Browse the directory in which the log file is to be saved.
3. Logging should begin upon reading the sensor data. To stop the software from logging further data, click “Unset Log”.

Flashing the firmware

• Software «Microchip Studio»:https://www.microchip.com/en-us/tools-resources/develop/microchip-studio
• Programmer «USB AVRISP XPII»:https://www.waveshare.com/usb-avrisp-xpii.htm

To successfully flash the firmware, the Evaluation Board must be powered on and have a connection to the programmer.
Power the Evaluation Board on by connecting it to the PC via the USB Dongle.

Please see pin assignment above. The recommended maximum length of the extension cable is 30 cm.

FAQ

• Q: How many sensors can be connected at once?
  • A: Up to 4 sensors can be connected simultaneously on the evaluation board.
• Q: What power supply options are available?
  • A: The board can be powered via a USB cable from a PC or a DC power source with a range of 5V to 15V DC.

CONTACT

• ADDRESS: Innovative Sensor Technology IST AG, Stegrütistrasse 14, 9642 Ebnat-Kappel, Switzerland
• Phone: +41 71 992 01 00
• Fax : +41 71 992 01 99
• Email: info@ist-ag.com
• www.ist-ag.com

All mechanical dimensions are valid at 25 °C ambient temperature if not differently indicated

• All data except the mechanical dimensions only have information purposes and are not to be understood as assured characteristics.
• Technical changes without previous announcements as well as mistakes reserved.
• Loading with extreme values during a longer period can affect the reliability.
• The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
• Product specifications are subject to change without notice.
• All rights reserved.

References

• Greeting Cards, Ecards & More | American Greetings
• AVR ISP ATmega64 ATmega128 ATmega1280 ATmega1281

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