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CBC-EVAL-05 Fiches technique(PDF) 5 Page - Cymbet Corporation

No de pièce CBC-EVAL-05
Description  Using the EnerChip Energy Harvesters with the TI LaunchPad
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Fabricant  CYMBET [Cymbet Corporation]
Site Internet  http://www.cymbet.com
Logo CYMBET - Cymbet Corporation

CBC-EVAL-05 Fiches technique(HTML) 5 Page - Cymbet Corporation

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AN-1050: EnerChip™ EH with TI LaunchPad
©2011 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
AN-72-1050 Rev A
Page 5 of 6
Using Energy Harvesting Data Logging Firmware with the LaunchPad V1.1
To use the LaunchPad as an energy harvesting datalogger you must use the IAR or Code Composer development
environment to build and load the datalogging firmware. The IAR and Code Composer project can be found on the
CD-ROM included with the Cymbet EVAL kit or is also available at the Cymbet Corporation web site: http://www.
cymbet.com/content/products-resource-docs.asp in the Software/Firmware table.
Install the MSP430G2231 chip into the LaunchPad board. Build and load the datalogger application to the
LaunchPad board. The datalogger application is based on the original LaunchPad thermal demo code and the
original LaunchPad code will be readily apparent from viewing the source. The datalogger code runs first and
then defaults to the LaunchPad thermal demo application when plugged into the USB port.
USB Powered Mode
In this mode the LaunchPad board gets its power from the USB cable. To configure for this mode make sure the
flex cable from the Cymbet Energy Harvester is disconnected. Install the original 5 jumpers in the J3 block.
Power for the board now comes from the USB connection.
Cymbet EVAL Kit Powered Mode
This configuration powers the LaunchPad board from one of Cymbet’s energy harvesting EVAL kits. To operate in
this mode, you must first unplug the LaunchPad from the USB port and remove jumpers VCC and RST from the
J3 jumper block. This keeps the energy harvester from powering the USB interface and only powers the actual
MSP430 MCU chip. Connect the 5-pin flat flex cable from the energy harvesting board to J6 of the LaunchPad
board as detailed in the appropriate previous section.
Log Temperature Data
To log temperature data, configure the LaunchPad board in CYMBET POWERED MODE. The LaunchPad will start
blinking both of the LEDs at a 1 second rate. A short press of the button starts logging. The green LED will blink
with each temperature logged and will initially log one temperature per 2 seconds. After the 32 temperatures are
logged, each with a corresponding blink of the green LED, the red LED will blink to indicate the logger registers
are full. Go to the next Read Temperature Data section to configure the LaunchPad to send its logged data and
clear itself for another run.
The 2-second logging interval is declared in a #define statement in the C source code and may be modified by
recompiling and reloading the firmware.
Read Temperature Data
To readout logged data, configure the LaunchPad board for USB POWERED MODE. When the LaunchPad board is
plugged into the USB port a COM port driver will appear in the device manager of Windows that is called MSP430
Application UART with an associated COM port number. Note this number. Start up a terminal emulator program
like TeraTerm or Hyperterminal and configure to hook this COM port at 9600 baud with no flow control and 1 stop
bit and 8 bits of data. The LaunchPad board will now blink the LEDs alternately at about a half-second rate. A
short press of the left button will cause any logged data to be sent to the terminal emulator as 8-bit ASCII HEX
values that represent the upper 8 bits of the 10-bit A/D converter reading the temperature sensor. If there is no
data logged, you will see a 00, on the terminal emulator to indicate no data present. If you don’t see any data the
terminal emulator is not configured correctly. If you see logged temperature data you may press the reset button
followed by a 1 second press of the left button to again send the data. To erase data press the RESET button
and then hold the left button down for over 3 seconds and the application will again send the data but erase it
afterwards. After readout the LaunchPad will revert to the original LaunchPad demo software.
The application may now be used to log new data.


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