SHT31 Smart Gadget User Guide Reference Design and Development Kit for Applications with SHT3x Sensors SHT31 humidity and temperature sensor LCD display for humidity, temperature and dew point in C and F Bluetooth Low Energy (BLE) connectivity to iOS and Android smartphones iOS and Android apps available Data logging capabilities Complete hardware, firmware and software design resources available Introduction The SHT31 Smart Gadget is a reference design circuit board which demonstrates the outstanding performance and ease of use of Sensirions humidity and temperature sensors. It not only shows humidity and temperature values on the display, but it can also communicate wirelessly with a Bluetooth Smart capable device like a smartphone. For developers, full design resources of the SHT31 Smart Gadget are available on GitHub. Development Kit Contents Smart Gadget main PCB equipped with SHT31 sensor, LCD display, push button and BLE module, including battery, supports and quick-start guide Apps for iOS and Android devices for download in respective app stores Complete design resources available on GitHub: - Hardware design (PCB layout, BOM) - Firmware code - Bluetooth profile definition - Source code for iOS and Android apps Copyright Sensirion AG, Switzerland 1/11 Contents of the User Guide 1 Quick Start Guide 2 2 Standard Operation 3 2.1 Assembly Instructions 3 2.2 Operation in Standalone Mode 3 2.3 Operation in Bluetooth Mode 3 2.4 Connecting to a Bluetooth Device 3 2.5 Using the Smart Gadget as a Data Logger 3 2.6 System Requirements 3 2.7 Important Security Advices 4 3 Extended Information for Developers 5 3.1 Hardware 5 3.1.1 Block Diagram 5 3.1.2 Bill of Materials 5 3.1.3 PCB Layout 6 3.2 Firmware for BLE Module 6 3.2.1 Debugging 6 3.2.2 BLE Profile Description 8 3.3 Firmware for LCD Driver 10 3.4 Software 10 3.4.1 iOS SmartGadget App 10 3.4.2 Android SmartGadget App 10 Revision History 11 1 Quick Start Guide 1. Getting Started Remove battery foil Break apart supports and slide main board into slots 2. Standalone Operation RH&T values are shown on the LCD display Switch between RH and dew point by pressing the button 3. Enable Bluetooth Press switch button for >1 sec. Smart Gadget ready to pair with a Bluetooth device 4. Operation with Smart Gadget App Download iOS or Android Smart Gadget app from your app store Start the app and connect Smart Gadget with your smartphone through the app Further information: www.sensirion.com/gadget Copyright Sensirion AG, Switzerland 2/11