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UM2260
User manual
Getting started with the STEVAL-GPT001V1 SensorTile add-on development kit
powered by thin-film solar modules
Introduction
The
STEVAL-GPT001V1
is an add-on development kit for the STEVAL-STLCS01V1 SensorTile module.
The kit and the module create a whole system which represents a multi-sensor IoT node with increased energy autonomy
thanks to the power harvested from thin-film solar modules (under indoor or outdoor lighting conditions) and conditioned to
recharge the battery through the
SPV1050TTR
energy harvester and battery charger.
The STEVAL-GPT001V1 kit consists of a watch-shaped silicon strap embedding three PV panels, a cradle board (which is an
evolution of the STLCR01V1 SensorTile Cradle board) whose core product is the SPV1050TTR and the power management
section to recharge a 100 mAh Li-Po battery.
The SPV1050TTR optimizes the energy harvested from the PV panels, thanks to the embedded MPPT algorithm, and
recharges the battery while guaranteeing over-voltage and under-voltage protection; the harvested energy allows a longer
system autonomy and makes available a 3.3 V LDO output to supply the
STEVAL-STLCS01V1
SensorTile module.
The customized STSW-GPT001V1 software offers a complete framework to build a typical multi-sensor node application and to
monitor battery charge, system autonomy, recharge time and the energy stored.
The firmware can be uploaded onto the STEVAL-STLCS01V1 SensorTile module via the STEVAL-GPT001V1 cradle board
SWD connector.
Figure 1.
STEVAL-GPT001V1 development kit
UM2260 - Rev 2 - November 2018
www.st.com
For further information contact your local STMicroelectronics sales office.
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Related Manuals for STMicroelectronics SensorTile STEVAL-GPT001V1
Summary of Contents for STMicroelectronics SensorTile STEVAL-GPT001V1
- Page 1 The firmware can be uploaded onto the STEVAL-STLCS01V1 SensorTile module via the STEVAL-GPT001V1 cradle board SWD connector. Figure 1. STEVAL-GPT001V1 development kit UM2260 - Rev 2 - November 2018 www.st.com For further information contact your local STMicroelectronics sales office.
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Page 2: Getting Started
UM2260 Getting started Getting started Hardware description 1.1.1 Kit overview STEVAL-GPT001V1 kit is an add-on to the SensorTile cradle board with on-board charger for Li-Ion and Li- Po batteries, a fuel gauge and a humidity and temperature sensor, housed in a watch-shaped silicon strap with embedded PV solar panels. -
Page 3: Software Description
UM2260 Software description Figure 2. STEVAL-GPT001V1 kit: smart watch direct access points The back cover can be removed to access the battery and the STEVAL-GPT001V1 cradle board. 1.1.1.2 STEVAL-GPT001V1 cradle board STEVAL-GPT001V1 cradle board hosts and supplies the STEVAL-STLCS01V1 SensorTile module; it increases the autonomy of the SensorTile module when the 5 V USB supply source is not available, thanks to the harvested energy provided by the PV panels. -
Page 4: Stblesensor App Description
UM2260 STBLESensor app description STBLESensor app description 1.3.1 SensorTile module activation and transmission When active (see Section 1.4.1 Startup), the SensorTile module can transmit the environmental data to STBLESensor app for smartphones and tablets. To start transmitting data, the SensorTile module has to be virtually connected to the app by the scan procedure described below. -
Page 5: Figure 4. Stblesensor App - Device List Tab
UM2260 STBLESensor app description Figure 4. STBLESensor app - Device List tab Step 4. After having selected one among the available devices, the app will automatically move to the Environmental tab showing the ambient temperature [°C], pressure [mBar] and humidity [%] values: UM2260 - Rev 2 page 5/25... -
Page 6: Rssi And Battery Information Tab
UM2260 STBLESensor app description Figure 5. STBLESensor app - Environmental tab Step 5. Scroll the display to left/right to move over the different tabs available in the app (plots of environmental sensors, accelerometer, Rssi and battery information). 1.3.2 Rssi and Battery information tab The Rssi and Battery information tab shows the transmission signal Rssi level and a fully detailed information list related to the battery when the system is powered by solar modules: •... -
Page 7: Figure 6. Stblesensor App - Rssi And Battery Information Tab
UM2260 STBLESensor app description Figure 6. STBLESensor app - Rssi and Battery information tab The figures below show the increase of system autonomy in minutes thanks to the lighting energy from 6500 K fluorescent lamp (250 to 5 k Lux) and solar (from 0.06 and 1 W/m2) light conditions. Figure 7. -
Page 8: Figure 8. System Autonomy Vs. Irradiance (Outdoor)
UM2260 STBLESensor app description Figure 8. System autonomy vs. irradiance (outdoor) The STSW-GPT001V1 firmware is designed to automatically enter a low consumption mode (sleep mode) in case the app is closed (BLE network processor inactive) and after one minute of inactivity of the SensorTile module accelerometer. -
Page 9: System Setup
UM2260 Figure 9. STBLESensor app - Rssi and Battery information tab after sleep mode System setup 1.4.1 Startup To start the system up, the SensorTile module and the battery must be plugged into the cradle board; the battery has to be supplied by the PV panels or by a 5 V source otherwise it remains electrically isolated. STEVAL-GPT001V1 cradle board power management architecture electrically connects the battery when the voltage on the... -
Page 10: Battery
UM2260 1.4.2 SensorTile module connection The SensorTile (STEVAL-STLCS01V1) is a tiny, square-shaped IoT module built on an 80 MHz STM32L476JG microcontroller and a Bluetooth low energy connectivity based on BlueNRG network processor as well as a wide spectrum of motion and environmental MEMS sensors, including a digital microphone. Figure 10. -
Page 11: Figure 12. Steval-Gpt001V1 Watch-Shape Silicon Strap (External Back View) And Battery Connection (Internal View)
UM2260 Step 2. Plug the battery cable in the related BATT connector slot. Step 3. Place the cover back, paying attention to the SWD connector position, and screw it in place. Figure 12. STEVAL-GPT001V1 watch-shape silicon strap (external back view) and battery connection (internal view) 1.4.3.2 Protection... -
Page 12: Figure 13. Steval-Gpt001V1 Cradle Board Battery Energy Harvesting: Indoor Irradiation
UM2260 The figures below show the energy harvester circuit performance in terms of MPPT accuracy and power conversion efficiency in case of light source from a fluorescent tube lamp 6’500 K (irradiation levels from 250 to 5 k Lux) and from the solar light (from 0.06 to 1 W/m2) irradiation conditions. Figure 13. -
Page 13: Humidity And Temperature Sensor
UM2260 In the STEVAL-GPT001V1 cradle board current limitation is set at 50 mA by R5 = 20 kΩ. The red LED (CHRG), mounted between 5 V supply rail and STBC08PMR CHGR pin, remains activated until full battery charge is achieved. The STBC08PMR BAT output pin is connected to the battery through the SPV1050TTR STORE pin and the pass... -
Page 14: Schematic Diagram
UM2260 Schematic diagram Schematic diagram Figure 16. STEVAL-GPT001V1 circuit schematic: power and connectors Battery charger USB, SWD, Power switch V_USB VBat V_USB V_USB U2STBC08PMR R220 ohm U1USBLC6-2P6 V_USB VSTORE USBUSB-MICRO R23NM VBUS VBat PROG RXD-USB_DM CHRG RXD-USB_DP CHRG 4.7 µF 4.7 µF PWR_ON 100 nF... -
Page 15: Figure 17. Steval-Gpt001V1 Circuit Schematic: Harvesting
UM2260 Schematic diagram Figure 17. STEVAL-GPT001V1 circuit schematic: harvesting TP1B BATT-CON VSTORE TP1A VBat 5.1M L122uH STL4P2UH7 SPV1050 R120 Ohm LDO3v3 VSTORE R132.7M 4.7 µF 8.2M 8.2M 10 nF 6.8M SD_CS 47 µF 100nF 100 nF SD_MOSI STL10N3LLH5 100k Ohm TP2B R261 Ohm 4.02M... -
Page 16: Bill Of Materials
UM2260 Bill of materials Bill of materials Table 1. STEVAL-GPT001V1 bill of materials Item Q.ty Ref. Part/Value Description Manufacturer Order code Battery BATT Molex 78171-0003 connector CHRG 0402 Red LED 100 nF 16 V C1, C8, C14, C15 Capacitors Murata GRM155R71C104KA88J ±10% 0402 4.7 µF 10 V... - Page 17 UM2260 Bill of materials Item Q.ty Ref. Part/Value Description Manufacturer Order code Ultra low power energy harvester and SPV1050 battery VFQFPN 3 mm SPV1050TTR charger with x 3 mm embedded MPPT and LDOs 22 µH 0.4 A ±20% Fixed inductor CoilCraft LPS3015-223 3.0x3.0x1.4 [mm3]...
- Page 18 UM2260 Bill of materials Item Q.ty Ref. Part/Value Description Manufacturer Order code 1 Ω 200 mW Resistor Vishay CRCW04021R00FKEDHP 0402 22 nF 16 V Capacitor 0402YC223KAT2A 0402 Nanopower TSU111 DFΝ6 high accuracy TSU111IQ1T 1.2x1.3 CMOS Op- 2 way, Jumper JMP-0402-3 LiPO-501225 Himax Battery...
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Page 19: Board Layout
UM2260 Board layout Board layout Figure 18. STEVAL-GPT001V1: top layer Figure 19. STEVAL-GPT001V1: bottom layer UM2260 - Rev 2 page 19/25... -
Page 20: Figure 20. Steval-Gpt001V1 Component Placement (Top And Bottom Layers)
UM2260 Board layout Figure 20. STEVAL-GPT001V1 component placement (top and bottom layers) UM2260 - Rev 2 page 20/25... -
Page 21: Revision History
UM2260 Revision history Table 2. Document revision history Date Version Changes 25-Sep-2017 Initial release. Updated Figure 1. STEVAL-GPT001V1 development kit. 09-Nov-2018 Minor text changes. UM2260 - Rev 2 page 21/25... -
Page 22: Table Of Contents
UM2260 Contents Contents Getting started ..............2 Hardware description . - Page 23 UM2260 List of tables List of tables Table 1. STEVAL-GPT001V1 bill of materials............16 Table 2.
- Page 24 UM2260 List of figures List of figures Figure 1. STEVAL-GPT001V1 development kit........... . . 1 Figure 2.
- Page 25 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
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