SENSIRION SHT31 Smart Gadget Reference Design

1/11 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 resource ...

2/11 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 ...

3/11 2 Standard Operation 2.1 Assembly Instructions Take the two supports and break them apart. Slide the circuit board into the slots in the supports, with one support on each side of the LC display. Remove battery insulation foil. Optionally, the temperature can be displayed in °F by pressing the switch button while inserting the battery. 2.2 Operation in Standalone Mode This is the default operating mode. The meas ...

4/11 The Smart Gadget apps run with Android 4.3 or later and iOS 8 or later, respectively. 2.7 Important Security Advices  Keep out of reach of children and pets (contains swallowable parts)  If any part is swallowed, contact a physician immediately  Battery type: CR2032  Dispose of the battery properly (special waste)  Smart Gadget operating temperature range: -10 to 60 °C  The Smart Gadget is inte ...

5/11 3 Extended Information for Developers The SHT31 Smart Gadget is designed to be a reference design and development kit that helps developers to kick-start their own projects with an SHT3x sensor, Bluetooth module and corresponding apps. The design resources are published on Sensirion’s GitHub page https://github.com/Sensirion. They include:  Hardware design data (PCB layout, schematics, BOM): https://github.c ...

6/11 Component Type Qty. Designator Footprint Manufacturer Manufacturer Part Number Crystal ABS07- 32.768KHZ- T 1 Q1 2SMD-ABS07 Abracon LLC ABS07-32.768KHZ-T Capacitors 100n, 10V/X7R 9 C1, C2, C3, C4, C5, C6, C7, C8, C23 C_0402 n/a n/a Capacitors 22u, 6V3/X5R 4 C10, C11, C12, C13 C_0805 n/a n/a Resistors 10k, 1% 2 R4, R6 R_0402 n/a n/a 3.1.3 PCB Layout PCB layout data including schematic, Gerber files, assembly files ...

7/11 The RX/TX Pins are not used by the Debugger but can be optionally used by your own application as a serial debug interface for printf messages. Connect the signals according to your debugger pin-out. Standard pin- outs for ARM Debuggers are: The 3V Pin of ST1 goes to VCC on the Debugger. 3.2.1.3 Steps to Flash/Debug BLE Module Firmware 1. Download or clone the Smart Gadget Firmware from https://github.com/Sensiri ...

8/11 3. Compile the project The free 32kB licence of Keil uVision is sufficient for compilation, the project currently uses around 30kB. 4. Download to target and optionally start debugging 3.2.2 BLE Profile Description There are five services available:  The Device Information Service contains information about the device, manufacturer, versions etc.  The Battery Service contains a Battery Level Characteristic ...

9/11 There is no official profile defined by Bluetooth SIG for Temperature/Humidity sensors and the profile described here is proprietary. Besides transmitting the live values, the device always logs the sensor values and if needed, historical data can be retrieved over Bluetooth Low Energy. Device Behavior:  BLE Advertising: If the button is pressed long enough (>1s) the BLE Advertising is turned on. After disconn ...

10/11 https://github.com/Sensirion/SmartGadget-Firmware/blob/master/Simple_BLE_Profile_Description.pdf 3.3 Firmware for LCD Driver The firmware for the LCD driver can be found on GitHub: https://github.com/Sensirion/SmartGadget-Firmware/tree/master/LCD_Driver_MC9S08LL8 3.4 Software 3.4.1 iOS SmartGadget App The software code for the Smart Gadget iOS app can be found on GitHub: https://github.com/Sensirion/SmartGadget- ...

11/11 Revision History Date Revision Changes 27.11.2015 1 First initial release Copyright© 2015 by Sensirion CMOSens® is a trademark of Sensirion All rights reserved Headquarters and Subsidiaries Sensirion AG Laubisruetistr. 50 CH-8712 Staefa ZH Switzerland Phone: +41 44 306 40 00 Fax: +41 44 306 40 30 [email protected] www.sensirion.com Sensirion Inc., USA Phone: +1 805 409 4900 [email protected] www.sensirion ...

Sensirion: 1-101294-01 SHT31 SMART GADGET ...