Embedded Files
Getting Started
Getting Started
If you are going to do anything with the WISP hardware you need to familiarize yourself with the schematics and layout.
WISP 4.1 Schematics and Layout
Next familiarize yourself with the general operation of the WISP
Design of an RFID-Based Battery-Free Programmable Sensing Platform.pdf
Debugging Tutorials
Debugging Tutorials
For hardware issues, see Debugging Hardware.
For firmware issues, see Debugging Firmware.
For RF Front End issues, see WISP RF FE Measurement Procedures.
General Questions
General Questions
& Discussion Board Archives
USB Debugger Power vs. WISP Power
see: http://wisp.wikispaces.com/message/view/home/11538397
Oscilloscope Recommendation
see: http://wisp.wikispaces.com/message/view/home/12966113
Is the Regulator Required?
see: http://wisp.wikispaces.com/message/view/home/12307113
The MSP430 Input Pins are Sinking Current
see: http://wisp.wikispaces.com/message/view/home/11002101
Where is the EEPROM Code?
see: EEPROM
Troubleshooting the USB Debugger
see: http://wisp.wikispaces.com/message/view/home/12772269
Measure / Test the RF Front End
see: http://wisp.wikispaces.com/WISP+Measurement+Procedures
Hardware Modifications
Hardware Modifications
Adding a sensor
Adding a sensor
The WISP Hardware Features page has a section on unused pins for external sensors. There is also a tutorial on Adding A New Sensor.
Adding a super capacitor
Adding a super capacitor
WISP doesn't ship with a supercap by default. Its easy to install - just solder a large electrolytic, tantalum or super capacitor into the two big thru-holes on the WISP.
Example of a 0.1F super capacitor installed on the WISP4.0
The WISP4.1 has been designed to receive a Kanthal 0.1F super capacitor. The two large through holes (lighted in red) are connected to gnd and the Vout through a 100ohm resistor, please review the schematics and layout for details.
Make sure the cap you order can handle at least 6V and make sure to get the polarity correct. Some parts links:
Electrolytic Cap
Somewhat bulky, lower density but relatively low leakage and low cost
Tantalum Cap
These have good density but high leakage (50uA to 150uA).
We've used this 1000uF part: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=718-1006-1-ND
However, they have newer 1000uF offerings such as: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=718-1619-1-ND
And higher density / higher leakage 2200uF such as: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=718-1403-1-ND
Super Cap
0.1F Kanthal MaxCap LX Series (Manufacturer Site) - Have to order direct. We have a bunch, and we'd be happy to send you some.
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