SENSIRION SHT31 Smart Gadget, Reference Design, Page: 5 / 12

© Copyright Sensirion AG, Switzerland 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.com/Sensirion/SmartGadget-Hardware

Firmware for BLE module and LCD driver, Bluetooth profile definition:
https://github.com/Sensirion/SmartGadget-Firmware

Software code for iOS app: https://github.com/Sensirion/SmartGadget-iOS
 Software code for Android app: https://github.com/Sensirion/SmartGadget-Android
3.1 Hardware
3.1.1 Block Diagram
3.1.2 Bill of Materials
Component Type Qty. Designator Footprint Manufacturer Manufacturer
Part Number
RH&T
Sensor SHT31 1 Sen1 SHT3x Sensirion AG SHT31
BLE Module BVMCN5103 1 IC2 BVMCN5103_Sma
ll Braveridge BVMCN5103-BK
LCD driver MC9S08L
L8CGT
1 IC1 QFN50P700X700-
48W2L_custom Freescale
Semiconductor MC9S08LL8CGT
LCD
Display LCD 1 LCD1 LCD_1209061_A1 AV Display 1209061_A1
Battery 3.3V 1 BAT1 BAT-HLD-001-
THM Linx
Technologies Inc. BAT-HLD-001-THM
Switch Switch 1 SW1 EVQ-Q2P02W Panasonic
Electronic
Components EVQ-Q2P02W
Bluetooth Low Energy
Module
Debug
Interface ST1
debug
interface
LCD Driver
SPI
Debug
Interface ST2
debug
interface
LCD Display
SHT31
I2C
Button
IO